单项选择题As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?()

A.Compression ratio
B.Fuel/Air ratio
C.Compression pressure
D.Lube oil pressure


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1.单项选择题Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to ()

A.test the starting system
B.remove condensation from the cylinders
C.check the compression
D.check for proper lube oil pressure

2.单项选择题In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to ()

A.turn the flywheel
B.reduce friction
C.overcome inertia
D.ignite the fuel

3.单项选择题Air in the fuel lines to the fuel injection nozzles of a diesel will result in ().

A.lower compression pressures
B.overheating without smoking
C.failure to start
D.a run away without load

5.单项选择题Cold weather starting of a diesel engine may be made easier by()

A.decreasing the compression ratio
B.using a special fuel having a high ignition temperature
C.increasing the starting air supply
D.heating the jacket water

6.单项选择题Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by ()

A.increasing the quantity of starting air
B.increasing the lube oil pressure
C.heating the engine fuel supply
D.heating the engine coolant

7.单项选择题The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?()

A.Faulty thermostatic bypass valve
B.Eroded zinc pencils in the heat exchanger
C.Steam formation in the expansion tank
D.Excessive leakage from jacket water pump seal

9.单项选择题Trunk-type diesel engine pistons are most effectively cooled by heat()

A.conducted through the engine block
B.conducted to water cooled cylinder walls
C.conducted through the piston crown
D.loss to escaping exhaust gases

10.单项选择题As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()

A.Exhaust temperatures
B.Raw water pressure
C.Lube oil pressure
D.Air box pressure