單項選擇題Gear-type flexible couplings are often used in diesel engine drive trains because they（）

A.require no lubrication under normal operating conditions
B.compensate for gross misalignment in the drive train
C.are able to transmit high torque ,even where slight misalignment exists
D.will rapidly disconnect the engine from the line shaft


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1.單項選擇題Keel coolers fouled with marine growth, will result in （）

A.higher raw water temperatures
B.higher jacket water temperatures
C.a malfunctioning thermostat
D.higher fuel temperature

3.單項選擇題Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?（）

A.Loss of compression for that cylinder
B.Misfiring or rough running
C.Damage to the valve
D.All of the above

4.單項選擇題Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）

A.Air will enter the cooling system
B.Carbon will plug the water cooled exhaust manifolds
C.The jacket water temperature will rise
D.The lube oil viscosity will increase

5.單項選擇題Aburned exhaust valve may be detected by a higher than normal （）

A.firing pressure
B.exhaust temperature from a particular cylinder
C.cooling water temperature
D.compression pressure