Question 465Motor Plants - Assistant Engineer
70% to passA four-stroke cycle main propulsion diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperature. The reason for the failure could be _______________.
Aglazed liners or pistons
Bhigh lube oil pressure
Cexcessive compression ratio
Dexcessive air leakage by rings and valves
AI Explanation
The correct answer is D) excessive air leakage by rings and valves. Explanation: A four-stroke cycle diesel engine requires proper compression to ignite the fuel and start the engine. Excessive air leakage past the piston rings or through the valves would result in reduced compression, preventing the engine from starting at normal cranking speed even with normal fuel pressure and ambient temperature. The other options, such as glazed liners/pistons, high lube oil pressure, or excessive compression ratio, would not directly cause a failure to start in this scenario.
Related Questions
Q269:If a particular liquid has a specific gravity of 0.96 kg/dm3 at 77°F, what will ... Q6:The speed of the camshaft in a two-stroke cycle diesel engine, running at 950 RP... Q30:Modern marine diesel engines equipped with mechanical fuel injection operate on ... Q477:The power output of a turbocharged diesel engine will drop if the cooling water ... Q259:Precombustion chambers differ from turbulence chambers in that precombustion cha...
Ready to test your knowledge?
Take a Motor Plants - Assistant Engineer Practice ExamOfficial Resources