单项选择题How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?()

A.One
B.Two
C.Four
D.Eight


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1.单项选择题The highest pressure in a diesel engine cylinder normally occurs ().

A.at TDC
B.before TDC
C.after TDC
D.during air starting

2.单项选择题What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?()

A.Spark plug
B.Heat of compression
C.Carburetor
D.Glow ping

3.单项选择题The main purpose of the piston oil scraper rings is to ().

A.seal the space between the piston and the liner
B.reduce the amount of lube oil burned in the combustion chamber
C.transmit heat from the piston to the cylinder liner
D.damp out fluctuations of the piston side thrust

4.单项选择题Maximum horsepower of a diesel engine is attained ().

A.when the engine RPM is pulled down by overload
B.at rated engine RPM
C.at 95 % of rated engine RPM
D.at 95 % of a properly adjusted governor RPM with the engine under full load

6.单项选择题In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in ().

A.two crankshaft revolutions in a two-stroke/cycle engine
B.two power strokes in a two-stroke/cycle engine
C.one power stroke in a two-stroke/cycle engine
D.two piston strokes in a two-stroke/cycle engine

7.单项选择题If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm ().

A.at each control station
B.in the chief engineer’s quarters
C.in the captains quarters
D.All of the above are correct

8.单项选择题White smoke exhausting from an operating diesel engine may indicate ().

A.a cracked liner
B.burning lube oil
C.an overloaded engine
D.insufficient combustion air

9.单项选择题Electrically operated safety devices on auxiliary diesel engines function to stop the engine by ().

A.increasing the volume of intake air
B.shutting off the fuel supply
C.increasing the engine back pressure
D.over-speeding the engine

10.单项选择题When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?()

A.During operation at low speed
B.During operation at rated speed, but low power output
C.During acceleration
D.All of the above