Question 61Motor Plants - 1st Asst/Chief70% to pass
During the starting of a diesel engine, compression gases are prevented from backing into the air starting system, shown in the illustration, by the_______________. Illustration MO-0046
AI Explanation
The correct answer is A) cylinder air starting check valves.
During the starting of a diesel engine, the compression gases are prevented from backing into the air starting system by the cylinder air starting check valves. These one-way valves allow air to flow from the air starting system into the engine cylinders, but prevent the compressed gases from the engine from flowing back into the air starting system. This protects the air starting system from any potential damage or interference.
The other options are incorrect because: B) the air starting control valve is responsible for regulating the air supply to the engine, not preventing backflow; C) the individual distribution valves distribute the starting air to the individual cylinders, but do not prevent backflow; and D) the high pressure in the starting air manifold alone does not prevent the compression gases from backing into the air starting system.
Related Questions
#59 A pre-arrival test is being performed with the engine on bridge control. The vessel has a slow speed engine with mechanical starting air system (not electronic). After a stop order, the engine fails to restart in the next ahead direction order. What would be your immediate actions to restart the engine, if the order was still ahead? #60 During maneuvering on a slow speed diesel engine vessel, a low starting air system pressure alarm is activated. Local starting air receivers' pressure gauges indicate proper pressures, and compressors are running and are 'loaded' up. What could cause the alarm? #62 In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without air starting valves fire first because the _______________.#63 Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration? Illustration MO-0046 #64 What type of engine lubrication oil filter system sends filtered oil directly to the high- pressure supply gallery?