Study individual questions with detailed AI explanations
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When calculating the indicated power developed in a diesel engine cylinder, 1 horsepower is equivalent to '33,000 foot-p...
What is the average piston speed of a five cylinder low-speed engine with a bore of 29.5 inches (75 cm), a stroke of 63 ...
A diesel engine indicator diagram has an area of 22 cm2 and a length of 12.5 cm. If the scale of the indicator spring is...
A six cylinder, two-stroke cycle diesel engine is 83% efficient and has a cylinder constant of 0.998 while operating wit...
An eight cylinder, four-stroke cycle, single acting diesel engine has a 650 mm bore and a 1400 mm stroke. What will be ...
The speed of the camshaft in a two-stroke cycle diesel engine, running at 950 RPM, is_______________.
A diesel engine cylinder has a swept volume of 125 cubic inches and a compression ratio of 13.5 to 1. What is the cleara...
If the piston stroke in a four-stroke cycle diesel engine is 10 1/2 inches and the speed of rotation of the crankshaft i...
A four cylinder, four-stroke cycle, single acting diesel engine has a 740 mm bore and a 1500 mm stroke. What indicated ...
Line "P" in the illustration is the_______________. Illustration MO-0126
Which of the following conditions will cause the engine to operate in area "A" of the diagram shown in the illustration?...
The diagram shown in the illustration may be used to determine the proper operation of the engine. Which of the followin...
Which of the following conditions would NOT be considered a valid reason for the diesel engine to operate in the area in...
In the pressure-volume diagram shown in the illustration, fuel injection occurs at point_______________. Illustration MO...
An indicator card or pressure-volume diagram, shows graphically the_______________.
The indicator card shown in the illustration is produced with a/an_______________. MO-0108
On the indicator card shown in the illustration, lines 'A' and 'B' indicate_______________. Illustration MO-0108
In the pressure-volume diagram, shown in the illustration, what occurs between points "e" and "f"? Illustration MO-0035...
In the pressure-volume diagram, shown in the illustration, the volume line is divided into 16 units indicating _______...
In the pressure-volume diagram shown in the illustration, curve 'A-d' indicates_______________. Illustration MO-0035 ...
In the pressure-volume diagram, shown in the illustration, what is indicated to have occurred by the line connecting poi...
On the cylinder indicator diagram illustrated, the dotted line indicated as 'L' is describing the _______________. Illus...
Which of the indicator diagrams illustrated depicts the condition that should be corrected by retarding only the timing?...
On the indicator card shown in the illustration, lines 'A' and 'B' indicate_______________. Illustration MO-0108 ...
Diesel engines are classified as reciprocating internal combustion engines because they_______________.
What determines the number of events occurring in a cycle of operation in an internal combustion engine?
The thermal energy produced by an internal combustion engine is transformed into_______________.
In describing engine operation, what does the term "cycle" mean?
The highest pressure in a diesel engine cylinder normally occurs_______________.
Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion cycle which is____________...
The load is always placed on the lower half of the main bearings in a/an_______________.
The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relat...
Which of the terms listed below represents the operational speed at which excessive engine vibration is created?
The bore of a diesel engine cylinder describes the _______________.
The cubic inch (or liter) displacement of a cylinder is determined by the diameter of the piston and the_______________...
The compression ratio of a diesel engine refers to the ratio between the _______________.
If the compression ratio is increased on any diesel engine,_______________.
The theoretical minimum compression ratio necessary to ensure compression ignition in a direct injection diesel engine ...
Which of the following relationships exist between the temperature developed in a combustion space, and the compression ...
The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its_______________.
The most important factor in engine performance is the actual power output at the end of the crankshaft available for d...
The average pressure exerted on a piston during each power stroke is termed_______________.
Most practical diesel engines today operate on a cycle which is a combination of the Diesel and Otto cycles. In this pr...
The pressure-volume diagrams illustrated are of four internal combustion engine cycles. Which one represents the theore...
If point #1 in the diagram shown is the beginning of gas compression, which of the cycles listed is being illustrated? I...
The minimum fuel oil delivery pressure required for efficient injection depends primarily on the_______________.
Fuel injection systems are designed to primarily meter fuel, atomize fuel, and_______________.
The degree of fuel atomization in a diesel engine cylinder depends primarily on_______________.
The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to _______________.
Injection pressure in a common rail fuel system is controlled by _______________.
The component shown in the illustration would be identified as a/an_______________. Illustration MO-0097
The component identified as item No.15 is used to_______________. Illustration MO-0016
In the large slow-speed main propulsion diesel engine shown in the illustration, the part labeled "G" is the__________...
According to the illustration, initial timing of fuel injection into the cylinder is controlled with the component tha...
According to the illustration, fuel cutoff timing in the cylinder is controlled with the component that is identified ...
Regarding the fuel injector shown in the illustration, the purpose of piece #38 is to_______________. Illustration MO-00...
The amount of fuel delivered by a unit injector is controlled by the_______________.
In a unit injector, an upper helix and lower helix are machined in the lower part of the plunger for _______________.
The control rack to a unit injector regulates fuel delivery by_______________.
Which type of diesel engine fuel nozzle is shown in the illustration? Illustration MO-0059
A main propulsion diesel engine is normally shutdown by _______________.
The overspeeding of the diesel engine driving an electric generator could cause _______________.
A normally operating diesel engine is shutdown by_______________.
Load control on a diesel engine is accomplished by_______________.
Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both...
The pneumatic circuit shown in the illustration is part of a control system used with large low-speed diesel engines. ...
The 3-position, 4-way directional control valve with a 30 bar output at "ee" as shown in the illustration (MO-0116) is a...
Which of the following statements describes the operation of the circuit shown in the illustration? Illustration MO-0114...
The device represented by the symbol "B" in the illustration is used to_______________. Illustration MO-0115
Which of the types of reduction gearing listed is best suited for medium-speed main propulsion units?
In the reversing reduction gear shown in the illustration, the forward and reverse main pinions are in constant mesh w...
Reduction gear casings are vented in order to _______________.
A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio?
The main engine thrust bearing shown in the illustration contains how many thrust shoes? Illustration MO-0121
How is lubrication provided to the device shown in the illustration? Illustration MO-0120
What type of bearing is shown in the illustration? Illustration MO-0120
What prevents the thrust bearing blocks shown in the illustration from rotating within the housing? Illustration MO-0120...
The minimum speed an engine must attain before ignition can occur depends upon_______________.
Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the _______________.
The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is ...
Theoretical perfect combustion in a diesel engine yields by-products of _______________.
The formation of carbon monoxide in diesel exhaust gases is reduced by_______________.
Turbulence of the compressed air charge in a diesel engine cylinder increases_______________.
In a diesel engine, after ignition of the fuel occurs, but before the piston reaches TDC, there is little change in the...
In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to______...
The greatest turbulence in a diesel engine cylinder is created by the _______________.
What is the term given to the process of breaking up fuel oil into very fine particles for better combustion?
Proper atomization of fuel in diesel engine combustion chambers will_______________.
Fuel oil penetration into the cylinder of a diesel engine is_______________.
Fuel droplets injected into a diesel engine cylinder must have adequate penetration to_______________.
Maintaining the proper fuel oil temperature will result in _______________.
A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is _____...
As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?
The time between injection and ignition of the fuel is known as _______________.
When is fuel injected into a cylinder of diesel engines?
For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?
Which area of the indicator diagram illustrated, indicates the ignition delay period in a diesel engine cylinder? Illust...
The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of t...
The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top de...
On the cylinder indicator diagram illustrated, the maximum rise in pressure occurs during the period labeled as_______...
Which statement about diesel engine combustion is true?
Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and should_____...
On the cylinder indicator diagram illustrated, the dotted line indicated as 'L' is describing the_______________. Illust...
Which area of the indicator diagram illustrated, indicates the afterburning period in a diesel engine cylinder? Illustra...
Item labeled 'R' as shown in section 6 of the illustration is identified as the_______________. Illustration MO-0025 ...
In the illustrated engine, the fuel camshaft gear drive housing is indicated as letter_______________. Illustration MO-0...
In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is run...
In the diesel engine illustrated, what part is under compression when firing is taking place in a particular cylinder? I...
In the pressure-volume diagram shown in the illustration, the atmospheric pressure line is indicated by line__________...
In diesel engines designed with a crosshead, the motion of the piston rod can be described as_______________.
Which of the indicator diagrams illustrated indicates the condition that should be corrected by retarding the timing, an...
In a large slow-speed propulsion diesel engine, the side thrust on the crosshead is the direct result of ______________...
While underway, which of the following would be the FIRST step in reversing a direct reversing large, slow-speed, main p...
In a large slow-speed propulsion diesel engine, the force applied to the piston is_______________.
Cast iron pistons used in large propulsion diesel engines are constructed with_______________.
Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cyli...
In the slow-speed diesel engine shown in the illustration, the part labeled "E" is the_______________. Illustration MO-0...
During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the follo...
The line identified as "I" in the illustration is used to_______________. Illustration MO-0066
Which letter represents the scavenging air system non-return valve in the illustration? Illustration MO-0003
Valve cages are used on some large diesel engines to _______________.
In the diesel engine shown in the illustration, the purpose of the part labeled "P" is to _______________. Illustration ...
A diesel engine crankcase ventilation system_______________.
A safety crankcase cover differs from other diesel engine access doors in that it is fitted with a_______________.
The part labeled "X" shown in the illustration is a_______________. Illustration MO-0003
According to the illustration, fuel delivery to the cylinder is terminated and controlled with the component that is i...
Which of the following processes is indicated by the flow arrows shown in the illustration? Illustration MO-0026 ...
Which of the listed design features is most common with a two-stroke cycle, low- speed main propulsion diesel engine? ...
There are two glands provided where the piston rod exits the cylinder shown in the illustration. The purpose of the to...
The diesel engine shown in the illustration, the exhaust manifold is indicated by the letter_______________. Illustratio...
The opening of an exhaust valve on a modern, large, low-speed, main propulsion diesel engine, may be actuated by_______...
The exhaust ports shown in the illustration are identified with the letter '_______________'. Illustration MO-0003 ...
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly pro...
The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in______________...
The fuel injector for the diesel engine shown in the illustration, is identified as_______________. Illustration MO-012...
Which letter represents the top deck (valve) cover of the engine shown in the illustration? Illustration MO-0122 ...
Device 'E' shown in the illustration is known as the_______________. Illustration MO-0122
The diesel engine water inlet jumper illustrated is represented by the letter or number_______________. Illustration MO-...
Component 'U' of the diesel engine shown in the illustration is called the_______________. Illustration MO-0122
The diesel engine wrist pin in the illustration is indicated by the component labeled_______________. Illustration MO-01...
Item '17' in the illustration is the dipstick. When should the length of the dipstick be changed? Illustration MO-0122 ...
In a two-stroke cycle, opposed-piston, diesel engine, one crankshaft operates several crank angles in advance of the ot...
The water inlet manifold for the diesel engine shown in the illustration is represented by the letter or number_______...
The diesel engine component labeled "3", shown in the illustration is called the_______________. Illustration MO-0122 ...
The diesel engine connecting rods shown in the illustration are distinctively named_______________. Illustration MO-0122...
Which of the listed cylinder head design features is shown in the illustration? Illustration MO-0013
Which of the following represents the diesel engine camshaft shown in the illustration and its relative rotating speed? ...
The diesel engine rocker arms shown in the illustration serve to_______________. Illustration MO-0122
The rocker arms of the diesel engine shown in the illustration are indicated by_______________. Illustration MO-0122 ...
The injector rack of the diesel engine shown in the illustration is indicated by the component labeled_______________....
Which letter represents the exhaust gas exit point for the diesel engine shown in the illustration? Illustration MO-0122...
The main lube oil manifold, for the diesel engine shown in the illustration, is represented by the letter or number___...
During the power stroke, the side thrust of a trunk type piston is a result of the angle_______________.
The diesel engine component labeled "1", shown in the illustration is called a/an_______________. Illustration MO-0122 ...
The inlet valves for the diesel engine shown in the illustration are indicated by the letter or number_______________....
The diesel engine component labeled "5", shown in the illustration is known as the_______________. Illustration MO-0122 ...
What is the function of component "13" shown in the illustration? Illustration MO-0122
Which of the bearings listed below is most widely used for the main and connecting rod bearings of a modern high-speed d...
Which of the components listed is only found in an opposed-piston engine?
Auxiliary diesel engines can be automatically shut down as a result of_______________.
Lube oil pumps taking suction from the sump of most small marine engines are usually _______________.
When a generator diesel engine is operated at partial load, as compared to full load, a decrease will occur in the aver...
Intercoolers installed on starting air compressors, reduce the possibility of_______________.
The cylinders labeled "B" and "C" in the illustration are used to_______________. Illustration MO-0125
The component labeled "A" on the engine reversing device shown in the illustration, performs its function by transmitt...
Auxiliary diesel engine electric starting motors use _______________.
The pinion of an auxiliary diesel-electric starting motor normally engages the flywheel ring gear by means of a/an_____...
In a Bendix starter drive, the pinion engagement with the flywheel ring gear is initiated by_______________.
Which internal combustion engine starting system uses a vane type fluid motor?
Hydraulic starters are installed on many lifeboat diesel engines instead of comparable air start systems, because______...
The purpose of the engine-driven hydraulic pump in an auxiliary diesel engine hydraulic starting system is to__________...
Which of the following operating characteristics of the Bendix drive friction clutch is associated with a Bendix drive s...
A Bendix drive starting motor disengages the drive gear from the flywheel by_______________.
In a diesel engine starting motor equipped with a Bendix drive, the pinion moves and meshes with the flywheel ring gea...
Diesel engine electric starting motors generally require heavier duty motors and operate at higher voltages than compara...
Electric starting motors for diesel engines require high current for operation and_______________.
Which type of starter motor is normally used in a diesel engine hydraulic starting system?
Air motors used for starting some auxiliary diesel engines are generally the type known as a/an_______________.
The illustration is of a/an_______________. Illustration MO-0044
When an engine fitted with a hydraulic starting system starts up, the starter is protected from the higher speed of the...
During the starting of a diesel engine, compression gases are prevented from backing into the air starting system, sho...
Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration...
The pilot valves in an air pilot starting system for a two-stroke cycle, direct reversing, main propulsion diesel engin...
A six-cylinder, four-stroke cycle diesel engine is fitted with a rotary distributor type air starting system. The speed...
Starting systems for large, direct reversing, main propulsion diesel engines are usually_______________.
In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illus...
When an air started, four-stroke cycle diesel engine is being cranked over, the starting air is admitted to each cylind...
In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without ai...
An oil-operated, direct reversing mechanism on a large, low-speed, main propulsion diesel engine, can serve to_________...
In order to reverse the rotation of a two-stroke cycle loop scavenged, direct reversing, propulsion diesel engine, the ...
In addition to the main starting air compressor, another air compressor, driven by a separate power source, is installe...
Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions will be made easier b...
Which of the listed diesel engine starting systems is most susceptible to difficulties in cold weather?
An accumulator used in a hydraulic starting system is generally located between the_______________.
Which of the routine maintenance procedures listed is required for starting air receivers?
When starting a diesel engine at temperatures below 70°F, the frictional resistance to turning will be _______________.
A two-stroke cycle diesel engine requires less starting air than a four-stroke cycle diesel engine, of equal displaceme...
Starting air check valves are held firmly on their seats by_______________.
A decrease in the flash point of diesel engine lube oil indicates the lube oil has become _______________.
Which of the following test indicators should be considered the most significant factor in determining as to whether or ...
A 'Blotter test' is a test performed on the lube oil of a diesel engine which can determine_______________.
If the analysis of used lube oil indicates a high content of iron particles, this could indicate _______________.
A magnetic strainer is primarily used in diesel engine reduction gear oil systems to remove small particles of_________...
How is the illustrated strainer element cleaned during engine operation? Illustration MO-0057
A spring-loaded relief valve is located on some lube oil filters in full flow systems to _______________.
Most large main propulsion diesel engines use a duplex lube oil strainer to _______________.
Where would a coarse screen wire mesh strainer normally be found on a diesel engine lubrication system?
Wrist pin bearings are difficult to lubricate because of their oscillating motion and_______________.
The upper piston rings in large, slow-speed, two-stroke cycle diesel engines are most effectively lubricated by oil ___...
Shaker, circulation, and spray are the three general methods used in_______________.
For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an_______________.
Proper lubrication of the main bearings is more easily obtained in a single acting four- stroke cycle diesel engine than...
A diesel engine exposed to widely varying ambient temperatures should use a lubricating oil with_______________.
In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of...
Lube oil filters remove contaminants more efficiently if the oil being filtered is_______________.
A well-lubricated bearing surface always appears _______________.
A diesel engine should use which type of lubricating oil?
The highest indicated lube oil pressure in a diesel engine should be expected when the engine oil is_______________.
Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?...
According to the diagram shown in the illustration, the lube oil system can best be described as a_______________. Ill...
The most crucial time for any bearing with regards to diesel engine lubrication is_______________.
How often should the lubricating oil of a diesel engine be changed?
Which of the following devices is normally provided to prevent oil starvation in a diesel engine lubrication system util...
Two important considerations for the proper lubrication of a diesel engine include, the delivery of the oil in sufficie...
The TBN value of diesel engine lube oil refers to its ability to _______________.
Which of the following should always be checked prior to starting a diesel engine?
Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the en...
On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by_______________.
Before starting a diesel engine that has an engine driven lube oil pump, the operator should_______________.
What type of engine lubrication oil filter system sends filtered oil directly to the high- pressure supply gallery? ...
In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the_...
Which of the following statements is true concerning a main diesel engine oil cooler?
Reduction gear lube oil temperatures for keel cooler installations are generally_______________.
Heat exchangers are most commonly found in a small auxiliary diesel engine_______________.
The lube oil cooler is located after the lube oil filter in order for_______________.
Maximum lube system operating pressure for a diesel engine is normally regulated by a/an_______________.
The illustrated device is used to_______________. Illustration MO-0050
The component labeled as part No.20 in the illustration is used to_______________. Illustration MO-0050
The adverse effects of burning high sulfur fuel can be compensated for by using a cylinder oil having sufficient_______...
Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are_______________.
One advantage of a vacuum feed sight glass indicator used on cylinder lubricators over the discharge side liquid filled...
The rate of cylinder lubricating oil metered to each cylinder of a large, low-speed, main propulsion diesel engine is _...
The device shown in figure "A" of the illustration is used to_______________. Illustration MO-0042
The device shown in the illustration is classified as a/an _______________. Illustration MO-0008
The device shown in the illustration is a_______________. Illustration MO-0008
Crankcase explosions in propulsion diesel engines result from _______________.
The purpose of an oil mist detector in a main propulsion diesel engine is to warn of _______________.
Which of the following problems could develop due to the accumulation of oil vapors in the crankcase of a diesel engine?...
Starting aids such as glow plugs, are installed on_______________.
Precombustion chambers and energy cells in high-speed, small bore diesel engines all serve to increase_______________.
Which of the combustion chambers shown in the illustration is referred to as an "energy cell" used in some small diesel...
The purpose of the energy cell, or air cell, is to_______________.
A multi-orifice fuel injection nozzle is usually used with which of the listed types of combustion chamber?
Open combustion chambers are designed to_______________.
What type of marine engine has a fuel nozzle and combustion chamber located between two pistons in a common cylinder lin...
A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an_______________.
Precombustion chambers differ from turbulence chambers in that precombustion chambers _______________.
Starting aids, such as glow plugs, are usually installed on _______________.
The combustion of fuel for the illustrated engine is initiated by_______________. Illustration MO-0020
Which of the listed types of precombustion chambers is used in the diesel engine shown in the illustration? Illustration...
The desirable properties of a marine fuel oil should include_______________.
With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the_______________.
The ignition quality of diesel fuel becomes LESS critical as_______________.
The cetane number rates fuels for diesel engines according to its_______________.
Which of the following statements is true concerning the cetane number of diesel fuel?
A mixture of 45% cetane and 55% alpha-methyl-naphthalene is found to have the same ignition delay as a sample of diesel ...
If a particular liquid has a specific gravity of 0.96 kg/dm3 at 77°F, what will be the specific gravity of the liquid, a...
For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest prac...
Which factor determines the size of the ring dam for a fuel oil centrifugal purifier?
Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?
Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is a...
The device labeled "D", as shown in the illustration, is the bowl _______________. Illustration MO-0112
The discharge nozzle shown in the illustration, is indicated by the letter . Illustration MO-0112
The device labeled "B", shown in the illustration is known as the _______________. Illustration MO-0112
The area indicated by the letter "L" of the device shown in the illustration is properly called the _______________. I...
The unit shown in the illustration is beginning the sludge discharge cycle. The operating liquid solenoid valve has been...
The gasket "U" shown in the illustration, is used to seal the liquid space below the _______________. Illustration MO-01...
The device labeled "H", shown in the illustration is referred to as the _. Illustration MO-0112
The device labeled 'C' shown in the illustration is known as the _______________. Illustration MO-0112
Where does the shoot cycle operating liquid first come in contact with the rotating forces of the device shown in the il...
What is used as the primary operating medium during the sludge discharge cycle, shown in the illustration? Illustration ...
The item indicated by the letter "F" of the device shown in the illustration is the . Illustration MO-0112
What terminates the sludge discharge cycle of the device shown in the illustration? Illustration MO-0112
The port "X" shown in the illustration allows water to enter the adjoining chamber. During what cycle of operation will...
The wear liner shown in the illustration is indicated by the letter_______________. Illustration MO-0112
The force developed by the liquid within space "J" of the device shown in the illustration depends upon_______________...
The area indicated by the letter "W", shown in the illustration is correctly termed the_______________. Illustration M...
The device labeled "A", shown in the illustration, is known as the_______________. Illustration MO-0112
During normal operation, the liquid retained in space 'J' of the device shown in the illustration is_______________. I...
Item "O" of the device shown in the illustration is the_______________. MO-0112
Which of the following statements describes "N" shown in the illustration? Illustration MO-0112
During the normal operation of the centrifuge shown in the illustration, the operating liquid solenoid and bypass valves...
For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because_______________.
To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of_______________.
Which of the following precautions should be taken prior to starting the separator shown in the illustration? Illustrati...
The device shown in the illustration can be automatically or manually desludged. The closing sequence at the end of the...
Which of the labeled figures illustrated, represents the correct alignment mark relationships of a properly reassembled ...
In the device shown in the illustration, the component lettered "A" is the_______________. Illustration MO-0012
How is oil supplied to the device shown in the illustration? Illustration MO-0127
Which of the following statements represents the working principle of the water transducer used with the separator shown...
Which of the following statements is accurate concerning the vibration sensing device used with the separator shown in t...
The temperature of the contaminated fuel oil fed to the centrifuge shown in the illustration should be _______________. ...
All alarms occurring on the control unit of the device shown in the illustration will_______________. Illustration MO-01...
The system shown in the illustration utilizes a water transducer which is_______________. Illustration MO-0127
How may water be removed from the bowl of the separator as shown in the illustration? Illustration MO-0127
The greatest difference between the centrifuge bowl shown in the illustration and that of a tubular bowl, with straight,...
The diesel engine shown in the illustration has the highest fuel pressure developed in the part labeled _______________....
Which of the listed types of gasket material should be used on high-pressure fuel oil lines on a diesel engine?
As shown in the illustration, the viscosimeter would be used to directly control the output of which of the following co...
Heavy fuel oil used in the system shown in the illustration will have the lowest viscosity_______________. Illustratio...
The purpose of the interlocked three-way valve shown in the illustration is to_______________. Illustration MO-0058 ...
If the separating temperature is to remain constant, what is the relationship between the specific gravity of the oil an...
Using the graph shown in the illustration, the oil being separated has a specific gravity of 0.87 kg/dm3 at 72.5°C. What...
From the graph shown in the illustration, if the separating temperature required is to be 167°F, and the specific gravit...
From the graph shown in the illustration, determine the size of the regulating ring required for the proper operation of...
Cooling the intake air supplied to a diesel engine will_______________.
A large, low-speed, main propulsion diesel engine uses sea water to directly cool the_______________.
An increase in the air inlet manifold pressure of a diesel engine will result in a/an_______________.
In a naturally aspirated diesel engine, the volume of air intake is directly associated with engine _______________.
What is the function of the aftercoolers installed in the diesel engine air intake system?
The section of the turbocharger which would be connected to the aftercooler inlet is labeled_______________. Illustrat...
Which of the air intake systems listed will result in the lowest specific fuel consumption?
Compared to a naturally aspirated diesel engine, a supercharged diesel engine has_______________.
A naturally aspirated diesel engine at full throttle will have an intake manifold pressure _______________.
The power consumed during the scavenging process of a diesel engine is known as the_______________.
The exhaust system for a turbocharged diesel engine functions to_______________.
Exhaust pipes for separate main propulsion diesel engines can be combined only when _______________.
One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the_______________...
In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in _____________...
The most common instrument used to measure diesel engine exhaust pressure is the_______________.
Which of the diesel engine exhaust mufflers listed is usually equipped with a spark arrestor?
A water jacket is placed around the exhaust manifolds of propulsion diesel engines to _______________.
In the engine shown in the illustration, the part labeled 'W' is cooled by _______________. Illustration MO-0003
The diesel engine shown in the illustration, which of the lettered parts listed is cooled by sea water? Illustration MO-...
The large, slow-speed, main propulsion diesel engine shown in the illustration, the part labeled 'B' contains_________...
The outlet from an expansion tank of a closed fresh water cooling system should be piped to the_______________.
Which set of valves will be opened intentionally to remove heat from the main engine jacket cooling water system shown i...
What is the function of the device labeled "3" shown in the illustration? Illustration MO-0111
What is the function of the item "7" shown in the illustration? Illustration MO-0111
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce_______________.
The operation of the lube oil cooler, shown in the illustration as item No.4, will be characterized by which of the foll...
What is the primary function of item '15' shown in the illustration? Illustration MO-0111
Which of the following statements represents the two major functions provided by the item labeled "20" shown in the illu...
The items labeled "21" and "22", shown in the illustration are used to remove_______________. Illustration MO-0111
What occurs within the tubes of the device labeled "23" shown in the illustration? Illustration MO-0111
Which of the following statements describes what will occur to the volume of water vapor as it is exposed to the lower t...
Device "27" shown in the illustration is used to_______________. Illustration MO-0111
Which of the valve arrangements listed would be correct for operating the distillation plant shown in the illustration? ...
Excess brine accumulated in the distiller, shown in the illustration, is removed during normal operation by___________...
During operation which device listed removes air and non-condensable gases from the unit shown in the illustration? Illu...
The graphic dotted line between items "27", "12", "9", and "20", shown in the illustration, is used to indicate the us...
Excluding line losses, how many distinct pressure drops will occur as sea water flows through all the heat exchangers in...
Which device is used to prevent overpressurization of the illustrated distiller? Illustration MO-0111
Where is the latent heat obtained to create vapor from the feedwater in the illustrated distiller? Illustration MO-0111 ...
Which of the following statements describes the approximate relation between the feedwater entering the unit shown in th...
Item "10" shown in the illustration is used to_______________. Illustration MO-0111
Cooling water pumps driven by direct reversing diesel engines are usually_______________.
The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and ...
The temperature at which an adjustable bellows type thermostatic valve operates is determined by _______________.
The thermostatic valve in the illustration is used for controlling the coolant temperature in a main propulsion diesel e...
Diesel engine jacket water is used in the fresh water distillation process as the _______________.
A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of t...
What would be considered a normal temperature increase between the inlet and outlet jacket cooling water of a medium or ...
Which operating parameter may need to be decreased when running a large main propulsion diesel engine at low load condit...
Using a cooling water temperature of 225°F (107.2°C), instead of 180°F (82.2°C) in an auxiliary diesel engine, will_____...
As a general rule, what would be the recommended operating water jacket outlet temperature range for medium-speed marine...
In a diesel engine closed fresh water cooling system, the cooling water pressure drop through the engine is 10 psig, and...
In a diesel engine jacket water cooler, with sea water cooling the fresh water, the_______________.
In a diesel engine closed fresh water cooling system employing a radiator, proper water temperature can be obtained by_...
If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST_______________.
When would the available energy of the exhaust gases of a two-stroke cycle diesel engine be insufficient to drive an exh...
Aftercooling of a turbocharged diesel engine will result in_______________.
The process of scavenging a two-stroke cycle diesel engine serves to_______________.
Why will a turbocharged diesel engine produce black smoke if excessive additional load is applied too quickly?
The average exhaust temperature of a two-stroke cycle diesel engine with a turbine- driven supercharger is lower than a ...
The diesel engine shown in the illustration, is provided with an auxiliary blower to_______________. Illustration MO-000...
A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which ...
During the valve overlap period, the exhaust pressure of a turbocharged, four-stroke cycle diesel engine must be less t...
Air scavenging of the cylinder shown in the illustration begins between figures_______________. Illustration MO-0025 ...
Large, two-stroke cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal op...
Which of the turbocharging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressu...
Which of the turbocharging systems listed operates with the least average back pressure in the exhaust manifold?
In a Roots-type rotary blower, the volume of air delivered is directly proportional to_______________.
Which of the designs listed will keep the lobes from making contact in a Roots-type blower?
In a two-stroke cycle diesel engine, a Roots-type blower is usually_______________.
Regarding the turbocharger shown in the illustration, the part labeled "B" would be attached to the_______________. Il...
Clearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished_______________.
In a turbocharger, inlet air velocity is increased in the_______________.
Which of the following statements is correct regarding a turbocharged four-stroke cycle diesel-generator?
If governor Item No.19 in the illustration were to break on a diesel engine operating under full load, the engine RPM ...
In the illustrated auxiliary diesel engine governor, decreasing the distance between piece No.6 and piece No.10 will a...
Which of the following statements is correct concerning the operating function of the governor shown in the illustration...
The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by ________...
Direct reversible main propulsion diesel engines would normally be fitted with a/an_______________.
Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The g...
Sensitivity for a diesel engine governor is described as the_______________.
The device used to limit engine torque at various engine speeds is called a_______________.
The principal characteristic of an isochronous governor is it will _______________.
Diesel engine control can be obtained by the bridge_______________.
In a simple hydraulic governor with speed droop, oil under pressure is maintained ready for use in the_______________.
As the load is being decreased on the engine controlled by the governor shown in the illustration, the_______________....
The function of the synchronizing motor on the generator governor illustrated is to_______________. Illustration MO-0092...
The governor, shown in the illustration, will have its preset speed droop altered whenever_______________. Illustratio...
What is the best way of stopping an overspeeding diesel engine?
An auxiliary diesel-generator continues to run after you try to shut down. Your next course of action should be to_____...
Which of the listed conditions will result in the failure of an auxiliary diesel engine to shut down?
When a piston is removed from a diesel engine for maintenance, the piston should be examined for_______________.
The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in _____________...
Excessive side clearance between a piston ring and its groove will cause the ring to_______________.
If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to ___________...
After a long period of operation, a wear ridge, caused by piston ring action, will develop near the top of the cylinder ...
When installing the bearing cap on the device shown in the illustration, which of the precautions listed must be observe...
What is the normal bearing clearance permitted at the horizontal axis of the shaft for the bearing shown in the illustra...
After following the prescribed procedures to measure the thrust bearing clearance shown in the illustration, the distanc...
The spray holes in diesel engine fuel valves should be cleaned using carbon solvent and_______________.
When running a large, dual fuel, main propulsion diesel engine on heavy fuel, which of the following precautions should ...
Air is normally bled from a diesel engine fuel system by _______________.
Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires_______________.
When a nozzle tester is being used to test a "closed" type fuel injection nozzle, a clogged nozzle orifice will be ind...
Which of the fuel nozzles listed requires the LEAST maintenance?
When tightening the lock ring "G" of the device shown in the illustration, two events are simultaneously accomplished. W...
After removing the bowl hood of the device shown in the illustration, excessive quantities of sludge are visible. Which ...
If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperature,...
Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at_______________.
A diesel-generator governor is hunting. After changing the oil, the governor is flushed and the compensation needle valv...
The most common contaminate of governor hydraulic fluid is_______________.
When the timing gear backlash for a Roots-type blower has become excessive, the problem is properly repaired by________...
When inspecting the valve mechanism shown in the illustration, normal maintenance would include_______________. Illust...
Decreasing the exhaust valve clearance of a diesel engine will cause the exhaust valve to open_______________.
Which of the following statements would apply when checking the valve clearance of the unit shown in the illustration? I...
In an auxiliary diesel engine, one reason for knurling the piston skirt is to _______________.
The service life of a worn aluminum piston for an auxiliary diesel, for which no spares are readily available, can be e...
Before any auxiliary diesel engine hydraulic starting system is opened for servicing or repair, you must_______________...
Sacrificial zinc anodes are used on the salt water side of diesel engine heat exchangers to _______________.
If the coolant temperature is too low as it passes through internally cooled fuel injectors, the injectors can be damag...
Ethylene glycol, when used as a coolant in a closed cooling system for a diesel engine, is more advantageous than untre...
Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could ...
High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by_______________. ...
A diesel engine may fail to start when being cranked, due to_______________.
If an auxiliary diesel engine equipped with an electric starting system cranks very slowly after repeated attempts to s...
Which of the following statements describes what will occur if the annular spaces, indicated by the letter "K" of the de...
As shown in the illustration, which of the following conditions would be responsible for a "low-pressure in oil outlet" ...
While operating the fuel oil centrifuge shown in the illustration, the bowl fails to open for sludge ejection. The pro...
While operating the fuel oil centrifuge shown in the illustration, the fuel oil is being continuously ejected with the ...
If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure th...
Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to...
The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm ...
Crank web deflection readings will give a positive indication of_______________.
When a fuel injection nozzle overheats, which of the problems listed can be expected?
In the common rail system, excessive pressure in the header may be caused by _______________.
Surface irregularities, such as erosion and pitting on injection pump plungers, will_______________.
High cylinder firing pressure, accompanied by low exhaust temperature, can result from_______________.
A diesel engine operates erratically, overspeeds, and fails to restart when cranked at normal speed. Which of the follow...
A propulsion engine, using the speed control circuit shown in the illustration, fails to function at speeds lower than t...
What would be the first indication that a tube leak has occurred in area '23'? Illustration MO-0111
If the wearing rings of device '7' shown in the illustration become worn, how will the evaporation rate in '23' be affec...
Which of the conditions listed would indicate a large condenser tube leak within the distiller shown in the illustration...
If valve "D" is opened during the normal operation of the distiller shown in the illustration, which of the events liste...
A diesel engine may be hard to start if the _______________.
Clogged or partially obstructed exhaust ports on a diesel engine can cause _______________.
A four-stroke cycle main propulsion diesel engine fails to start at normal cranking speed with normal fuel pressure and ...
A diesel engine cylinder head can crack as a result of _______________.
Combustion gas venting through the expansion tank can be caused by a_______________.
Antifreeze solutions containing ethylene glycol should not be mixed with corrosion protection oils, as the resultant mi...
Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling water t...
What could cause the bypass valve in a full-flow lubrication system to open?
Which of the following effects will excessively cold lube oil have on the operation of a diesel engine?
Lube oil in the fresh water cooling system of a diesel engine may result from a_______________.
On a diesel engine with direct-cylinder admission air starting, a leaking air starting valve would be indicated by_____...
For a diesel engine, approximately how long can an electric starter motor be operated continuously before damage may beg...
When starting air is admitted, a diesel engine turns over very slowly without firing. The cause may be_______________.
Which of the following conditions is most likely to occur if the electric starter motor pinion gear fails to disengage f...
The power output of a turbocharged diesel engine will drop if the cooling water flow through the aftercooler is interru...
Corrosion and grooving on the blading of an exhaust driven turbocharger is caused by certain components of residual fuel...
Excessive mechanical and pulsating vibrations developed in a main propulsion diesel engine may be more likely to cause ...
If the speeder spring of a main propulsion diesel engine governor breaks while operating at full load, the engine RPM w...
The hunting of a diesel engine may be caused by _______________.
If the operating speed of a diesel engine increases without an apparent change in the engine control settings, you may ...
Governor hunting is caused by _______________.
Excessive vibration from an auxiliary boiler could be caused by_______________.
Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?
If sludge accumulates on the underside of a diesel engine piston, it will _______________.
Before being shut down, a diesel engine should idle a few minutes in order to_______________.
The diesel engine shown in the illustration can be fitted with a pyrometer at each exhaust elbow. If one of the cylinder...
The instrument shown in the illustration would be used on a diesel engine to_______________. Illustration MO-0031 ...
White smoke issuing from the exhaust of an auxiliary diesel engine could mean _______________.
If the relief valve on a diesel engine cylinder lifts, the cause could be due to _______________.
Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by _______________.
If there is a 'clicking' sound in the valve compartment of a diesel engine, the cause may be _______________.
Excessive wear at part No.11, shown in the illustration would result in _______________. Illustration MO-0027
The gear drive, shown in the illustration, can have the backlash determined best by using a_______________. Illustrati...
When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, ...
Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or ______________...
One cause of diesel engine fuel ignition delay is_______________.
When restarting a heavy fuel diesel engine that has been stopped for some time, the engineer should_______________.
Before any work is to be carried out on a burner in an automatically fired auxiliary boiler, you should always_________...
Which of the following precautions should be taken when cleaning the air filter on a diesel engine equipped with a turbo...
The principal hazard to personnel when using a diesel engine fuel nozzle tester is_______________.
An immediate repair is required if a leak occurs in the high-pressure fuel piping between the injection pump and fuel n...
When a nozzle tester is used to check the spray pattern of a diesel fuel injection nozzle, which of the following statem...
When cleaning a duplex strainer, it is important for _______________.
The starter control valve in the hydraulic system shown in the illustration is malfunctioning. Before removing the val...
Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve? ...
If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase_______________. ...