Motor Plants - 1st Asst/Chief

During main engine performance testing it is noticed that the firing pressure of one cylinder is higher than the average...

During main engine performance testing it is noticed that one cylinder has firing and compression pressures lower than a...

The lower water seal on a diesel engine wet cylinder liner must allow for liner axial movement. This seal is most comm...

Which construction detail is apparent in the connecting rod and piston assembly shown in the illustration? Illustration ...

Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?

The diesel engine shown in the illustration utilizes the type of cylinder construction identified as_______________. Il...

Which of the following statements is correct concerning the connecting rod and piston assembly shown in the illustration...

Piston cooling fins are located_______________.

Which of the conditions listed could cause the cylinder relief valves on a large, low- speed, propulsion diesel engine t...

Which of the following procedures should be carried out to permit the continued operation of a crosshead engine with a l...

A main propulsion diesel engine crankshaft bearing lacking sufficient 'crush', will _______________.

The ring lands on a large, low-speed, main propulsion diesel engine piston may crack due to_______________.

One method of determining crankshaft misalignment is by_______________.

When inspecting pistons, liners, and rings of a large two-stroke cycle diesel engine through the cylinder ports, a wet ...

The most practical way of detecting an overload in one cylinder of an operating large, low-speed, main propulsion dies...

When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylin...

If a valve seat insert, similar to that shown in the illustration is cracked, this may be indicated by_______________. I...

Bouncing of the valve gear in a diesel engine can be caused by_______________.

Excessive wear at part #11, as shown in the illustration, would result in_______________. Illustration MO-0027

Worn diesel engine intake valve guides can result in_______________.

Low compression pressure in a diesel engine can be caused by_______________.

Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by_______________.

Telescopic pipes which are attached to water cooled pistons of large, slow-speed, main propulsion diesel engines are de...

In the illustrated engine, the main camshaft controls the timing of which of the following components? Illustration MO-0...

Which of the listed design features is most common with a two-stroke cycle, low-speed main propulsion diesel engine? ...

The piston rod scraper box incorporated in a two-stroke cycle, crosshead diesel engine serves to_______________.

In what figure of the illustration does the crosshead experience the greatest side thrust? Illustration MO-0025

There are two glands provided where the piston rod exits the cylinder shown in the illustration. The purpose of the to...

The lower end of the piston rod, shown in the illustration, is fitted into the_______________. Illustration MO-0003 ...

If the speed of the propeller is 135 RPM, the speed of the engine camshaft shown in the illustration will be__________...

Which of the following statements would apply when checking the valve clearance of the unit shown in the illustration? I...

When inspecting the valve mechanism shown in the illustration, normal maintenance would include_______________. Illust...

After testing your medium-speed engine's exhaust valve springs you find one with a spring constant that is lower than s...

When a naturally aspirated four-stroke cycle diesel engine is converted for supercharging, which of the following change...

While inspecting diesel engine combustion space components, which components would you consider for particular scrutiny ...

If an auxiliary diesel engine equipped with an electric starting system cranks very slowly after repeated attempts to s...

High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by _______________.

In a four-stroke cycle diesel engine, badly worn intake valve guides can cause excessive _______________.

On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter cartridg...

In diesel engines, hydraulic valve lifters are used to_______________.

The intake and exhaust valves used in a diesel engine are returned to their seats by _______________.

The part labeled "G", as shown in the illustration, is a_______________. Illustration MO-0040

When two cams of the same diameter, one with tangential flanks and the other with convex flanks are compared, the cam ...

The valve cam slope angle determines the_______________.

In the auxiliary diesel engine, shown in the illustration, the_______________. Illustration MO-0006

Before any auxiliary diesel engine hydraulic starting system is opened for servicing or repair, you must ______________...

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...

A four-stroke cycle auxiliary diesel engine fuel cam has shifted from its original position during maintenance. To ensur...

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...

In order to reverse the rotation of a two-stroke cycle loop scavenged, direct reversing, propulsion diesel engine, the ...

Which internal combustion engine starting system uses a vane type fluid motor?

Which of the following operating characteristics of the Bendix drive friction clutch is associated with a Bendix drive s...

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_______________.

Hydraulic starters are installed on many lifeboat diesel engines instead of comparable air start systems, because _____...

Intercoolers installed on starting air compressors, reduce the possibility of _______________.

A pre-arrival test is being performed with the engine on bridge control. The vessel has a slow speed engine with mechani...

During maneuvering on a slow speed diesel engine vessel, a low starting air system pressure alarm is activated. Local st...

During the starting of a diesel engine, compression gases are prevented from backing into the air starting system, sho...

In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without ai...

Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration...

What type of engine lubrication oil filter system sends filtered oil directly to the high- pressure supply gallery? ...

The device shown in the illustration is a_______________. Illustration MO-0008

The purpose of an oil mist detector in a main propulsion diesel engine is to warn of _______________.

The device shown in the illustration is classified as a/an_______________. Illustration MO-0008

The device shown in figure "A" of the illustration is used to _______________. Illustration MO-0042

The illustrated device is used to_______________. Illustration MO-0050

The rate of cylinder lubricating oil metered to each cylinder of a large, low-speed, main propulsion diesel engine is _...

One advantage of a vacuum feed sight glass indicator used on cylinder lubricators over the discharge side liquid filled...

Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are _______________.

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 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 ...

Crankcase explosions in propulsion diesel engines result from _______________.

Which of the following effects will excessively cold lube oil have on the operation of a diesel engine?

Oil analysis for a crosshead type diesel engine indicates the TBN of the crankcase lubricating oil is increasing. This i...

A dirty lube oil strainer can result in_______________.

Lube oil in the fresh water cooling system of a diesel engine may result from a _______________.

What could cause the bypass valve in a full-flow lubrication system to open?

Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because ____________...

A bronze bearing liner with a lead-tin flashing has a milky-white color over most of its surface and some areas of exp...

While underway, a slow-speed diesel engine lube oil sump level slowly begins to decrease. Which of the following should ...

Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could b...

On a slow-speed, diesel-propelled vessel operating with constant slip, what is the effect on fuel consumption with an in...

While bunkering heavy fuel, what quick/easy test can one perform onboard to determine the compatibility of 'old' with 'n...

You are onboard a vessel with a slow-speed crosshead type engine. The fuel just received has a significantly lower sulfu...

Does sulfur content of heavy fuel oil effect the fuel rate of a diesel engine and why or why not?

Catalytic fines comprised of aluminum oxide and/or silicon dioxide are a common contaminant of residual fuels. Which die...

When is fuel injected into a cylinder of diesel engines?

Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and should_____...

The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top de...

The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of t...

The purpose of the interlocked three-way valve shown in the illustration is to _______________. Illustration MO-0058 ...

Heavy fuel oil used in the system shown in the illustration, will have the lowest viscosity. Illustration MO-0058

The greatest difference between the centrifuge bowl shown in the illustration and that of a tubular bowl, with straight...

The temperature of the contaminated fuel oil fed to the centrifuge shown in the illustration should be_______________. I...

What terminates the sludge discharge cycle of the device shown in the illustration? Illustration MO-0112

The area indicated by the letter "W", shown in the illustration is correctly termed the . Illustration MO-0112

The device labeled "D", as shown in the illustration, is the bowl_______________. Illustration MO-0112

During the change over period from residual to distillate fuel the final fuel filters clog at a decreasing time interval...

What operational difficulties are associated with fuel incompatibility?

A motor vessel has three centrifuges to pre-treat the fuel which can be configured to operate in series, parallel, and s...

A motor vessel has two centrifuges to pre-treat fuel to the engine(s) which may be configured to operate in series or pa...

Which of the following precautions should be taken prior to starting the separator shown in the illustration? Illustrati...

In pre-treating fuel oil on a motor vessel, what would you consider the most important factor to prevent high temperatur...

When changing over from residual to distillate fuel on a slow-speed diesel main engine, what is a good guideline to foll...

When changing over from residual to distillate fuel on a slow-speed diesel propelled vessel, you should limit the rate o...

After removing the bowl hood of the device shown in the illustration, excessive quantities of sludge are visible. Which ...

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...

As Chief Engineer of a slow-speed diesel engine vessel equipped with an ALCAP fuel oil purification system. You note a d...

Your ship is equipped with ALCAP heavy fuel oil purifiers. The watchstander reports excessive water drained from the fue...

Which of the following statements describes what will occur if the annular spaces, indicated by the letter "K" of the de...

If item "F" begins leaking during operation, which of the following operating conditions will NOT occur? Illustration MO...

While operating the fuel oil centrifuge shown in the illustration, the fuel oil is being continuously ejected with the ...

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...

When reassembling the bowl of the centrifuge, shown in the illustration, the alignment mark on the locking ring passes t...

On a slow-speed diesel engine vessel equipped with an ALCAP fuel oil purification system, what would be a symptom of an ...

The component shown in the illustration would be identified as a MO-0097

The component identified as item #15 is used to _______________. Illustration MO-0016

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 ...

As shown in the illustration of the fuel injection pump, the component labeled "N" would be identified as the___________...

As shown in the illustration of the fuel injection pump, the function of the area designated as "L" is to_____________...

In the illustration shown, moving the component labeled "E", further to the left, will result in_______________. Illustr...

Which of the following statements represents the function of the plunger flange labeled "A" shown in the illustration? I...

What is the purpose of the "window" installed in the housing of an individual jerk pump?

Carbon deposit build up on the injection nozzle orifice is least likely to occur when using which type of fuel injector ...

Which type of diesel engine fuel nozzle is shown in the illustration? Illustration MO-0059

Regarding the fuel injector shown in the illustration, the purpose of piece #38 is to_______________. Illustration MO-00...

Differential needle valves used in fuel injectors are directly closed by_______________.

The amount of fuel delivered by a unit injector is controlled by the_______________.

The item labeled #16 in the illustration is a stack of spring washers. Their function is to_______________. Illustratio...

Which of the fuel nozzles listed requires the LEAST maintenance?

You are testing a closed fuel injection nozzle using a nozzle tester. A pressure slightly less than design valve opening...

Uneven bolt tightening during the installation of a fuel injection pump can result in _______________.

Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires_______________.

Which of the following statements concerning the factors affecting ignition delay is correct?

High cylinder firing pressure, accompanied by low exhaust temperature, can result from _______________.

Heat damage to fuel injection nozzles can be prevented by avoiding _______________.

Faulty operation of diesel engine fuel injection nozzles can be a direct cause of _______________.

Which of the following problems is the main source of fuel pump and injection system malfunctions?

Surface irregularities, such as erosion and pitting on injection pump plungers, will _______________.

One cause of diesel engine surging can be a result of _______________.

While examining a used fuel injection nozzle(s), one finds worn and enlarged orifices. What does this indicate about th...

Injection lag in a diesel engine may be caused by_______________.

Problems with the diesel engine fuel injection pump are usually caused by_______________.

In the common rail system, excessive pressure in the header may be caused by_______________.

Poor combustion in a diesel engine can be caused by _______________.

The diesel engine shown in the illustration, is provided with an auxiliary blower to_______________. Illustration MO-000...

In a two cycle diesel engine, a Roots-type blower is usually_______________.

Which of the following devices will increase the power output of a diesel engine without increasing its frictional load?...

Clearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished _______________.

A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which ...

Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of th...

Which of the couplings listed is normally not repairable, and is usually replaced if completely damaged?

When installing the bearing cap on the device shown in the illustration, which of the precautions listed must be observe...

What is the maximum allowable clearance permitted between the bearing, shown in the illustration and the shaft along its...

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...

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 _______________...

The gear drive, shown in the illustration, can have the backlash determined best by using a_______________. Illustrati...

The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm ...

When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs...

Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown ...

Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases by _______________.

Which of the following statements concerning fire-tube boilers is correct?

Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler?

Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting...

The boiler shown in the illustration would be classed as MO-0064

The gage glass on a coil-type auxiliary boiler is connected to the_______________.

A variable capacity, pressure atomizing, fuel oil burner functions to_______________.

Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in ...

When the steam pressure drops below a set value on an automatically fired auxiliary boiler, fitted with rotary cup atomi...

Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a _______________.

The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler, are automatically closed by...

Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary...

The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and _______________.

The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent____...

In the water level electrode assembly, shown in the illustration, the feed pump should restart when the level of the wat...

In the event of a flame failure in an auxiliary water-tube boiler, you must _______________.

A safety valve on an auxiliary boiler simmers constantly and cannot be stopped by several quick blow-offs using the ha...

A feed pump for an auxiliary boiler might lose suction if the _______________.

Burner ignition failure in an automatically fired auxiliary boiler would be caused by _______________.

With which of the following types of diesel engine arrangements is a waste heat boiler most likely to produce the maximu...

Casing drains may be required on a waste heat boiler gas passage side to_______________.

An exhaust gas bypass is installed on a waste heat boiler in order to_______________.

Waste heat boilers may be equipped with vents on the feedwater heater heads to _______________.

The purpose of designing some waste heat boilers with sinuous fire tubes, is to _______________.

As shown in the illustration, the component labeled "H" would be identified as a_______________. Illustration MO-0128 ...

As shown in the illustration, the component labeled 'E' would be identified as a_______________. Illustration MO-0128 ...

In general, diesel engine waste heat boiler construction is usually of the_______________.

As shown in the illustration, the function of component "1" is to_______________. Illustration MO-0128

When checking for the presence of sulfite in the feedwater of an auxiliary boiler, you are in essence checking_________...

Before any work is done on a burner in an automatically fired auxiliary boiler, you should always_______________.

Before any work is to be carried out on a burner in an automatically fired auxiliary boiler, you should always ________...

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_______________.

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...

Which of the following precautions should be taken when cleaning the air filter on a diesel engine equipped with a turbo...

Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple tur...

If a tube ruptures in a water-tube auxiliary boiler due to low water, you should_______________.

What is the best way of stopping an overspeeding diesel engine?

If a crankcase explosion due to a hot spot were to occur, the size of the explosion is dependent on which of the followi...

Which of the following oil mist to air ratios would most likely lead to the most severe crankcase explosion?

In the event of a crankcase rich oil mist to air mixture explosion, where the doors are blown off the engine, which of t...

After stopping a diesel engine with a high main bearing temperature, what is the time one needs to wait before a diesel ...

Which of the following is one of the ways to prevent a scavenging fire on a slow speed diesel engine?

Oil in a scavenging air space on a slow-speed diesel engine can be ignited by which of the following?

If a scavenging air space fire occurs on a slow speed diesel engine and the engine is stopped, which of the following sh...

Which of the following would indicate a scavenging air fire in a slow speed diesel engine?

If a diesel engine were running at 20% overload with a smoky exhaust, you should_______________.

In accordance with Coast Guard Regulations (46 CFR Part 112), which of the listed starting aids is acceptable for use wi...

What device is installed and used as a safety feature to satisfy Coast Guard regulations for the unit shown in the illus...

Coast Guard Regulations (46 CFR Part 56) require steel tubing connections and fittings used with diesel fuel oil systems...

fittings used with diesel fuel oil systems to be either flared or _______________.

A propulsion engine, using the speed control circuit shown in the illustration, fails to function at speeds lower than t...

The governor utilized with the device shown in the illustration has become inoperative while the vessel is underway at s...

A diesel engine operates erratically, overspeeds, and fails to restart when cranked at normal speed. Which of the follow...

The pneumatic circuit shown in the illustration is part of a complex large low-speed engine control system. Which of the...

If the input signal rises above the setpoint of '17A', shown in the illustration, but remains below the setpoint of '1...

The circuit shown in the illustration represents a/an_______________. MO- 0115

Which of the following statements describes the function of the device labeled "C" shown in the illustration? Illustrati...

What is the primary purpose of the pneumatic component shown in the illustration? Illustration MO-0119

The reversing cams of some four-stroke cycle diesel engines are brought into position by_______________.

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_______________.

If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will_______________...

A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufact...

Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at _______________.

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 _______________.

Governor hunting is caused by_______________.

If the operating speed of a diesel engine increases without an apparent change in the engine control settings, you may...

A schematic diagram of an isochronous hydraulic governor is shown in the illustration. When the load is removed the sp...

Increasing the oil pressure acting on the power piston of the hydraulic governor shown in the illustration will_______...

The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to _______________.

The governor for an emergency diesel generator is shown in the illustration. When a large change in load results in a ch...

Which of the following statements is correct concerning the operating function of the governor shown in the illustration...