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单选题
（） is a source of power by which the diesel engine may operate.
A
Water energy
B
Electrical energy
C
Chemical energy
D
Heat energy
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mechanicalD
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insufficient fuel for combustionC
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turbocharger malfunction or failureB
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单选题Which statement about diesel engine combustion is true?（）A
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it has a longer power strokeB
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crankcaseB
cylinderC
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单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）A
The coolant temperature must be maintained at 180℃B
The thermostatic bypass valves must be manually opened before the engine is startedC
The pressure cap must be removed while the engine is securedD
Electrical power to the heater must be secured before the cooling system is drained
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单选题（） may be the first possible cause which makes the engine to lose power or slow down when it is running.A
Hot bearingB
Starting valvesC
Unequal distribution of loadD
Excessive crankshaft clearance
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单选题Wind power is an ancient source of energy________ we may return in the near future.A
on whichB
by whichC
to whichD
from which
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单选题Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）A
Injection pressuresB
Control air supply pressureC
Cooling water flow through after-coolersD
Lube oil temperature
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