單項(xiàng)選擇題Critical speed in diesel engines occurs when engine torque pulsations become （）

A.opposed to the crankshaft rocking couple
B.resonant with the crankshaft natural frequency
C.critical fore and aft crankshaft vibrations
D.horizontal whipping motions of the crankshaft


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1.單項(xiàng)選擇題Air receivers installed in starting air systems are to be （）.

A.cylindrical in shape with service connections located at the top and bottom
B.opened and made available for inspection during biannual inspections provided
C.with automatic drain traps for the removal of moisture
D.so installed as to make the drain connections effective under extreme conditions of trim

2.單項(xiàng)選擇題Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? （）

A.Hydraulic stress and distortion will develop
B.Hot spots will develop
C.Fuel oil viscosity will increased
D.An increase in trapped deposits of scale and dirt

3.單項(xiàng)選擇題The two strokes of a two-stroke/cycle diesel engine are （）

A.power and intake
B.intake and exhaust
C.exhaust and compression
D.compression and power

4.單項(xiàng)選擇題Which of the items listed causes a direct acting mechanical governor to operate the engine fuel control linkage?（）

A.Hydraulic oil pressure
B.Servomotor action
C.Flyweight centrifugal force
D.Relay motion

5.單項(xiàng)選擇題Combustion knock occurring in a diesel engine can be caused by （）

A.low coolant temperature
B.insufficient fuel
C.high ambient temperature
D.carbon buildup on the injector tips