單項(xiàng)選擇題Which of the following statements represents an advantage of an electromagnetic clutch?（）

A.Large misalignments can be tolerated between the shaft and engine coupling
B.Slip is held to a minimum when reversing shaft rotation
C.Engine torsion vibrations to the driven shaft are eliminated
D.It aids in maintaining power factor


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2.單項(xiàng)選擇題An individual injection pump is designed for variable beginning and constant ending of injectionFor diesel engines operating at constant speeds, the start of injection will（）

A.advance as the load increases
B.retard as the load increase
C.remain unchanged regardless
D.always occur at top dead center

3.單項(xiàng)選擇題The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）

A.compensate for low oil level
B.increase governor promptness
C.prevent governor hunting
D.limit engine load

4.單項(xiàng)選擇題If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the（）

A.rack position should be adjusted
B.compensating needle valve should be opened fully compensating
C.needle valve should be adjusted to stabilize operation
D.speed limiting device should be adjusted

5.單項(xiàng)選擇題Which of the listed problems would be indicated by an accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?（）

A.Excessive cylinder liner
B.water in the fuel system
C.Cracked cylinder liner
D.Leaking lube oil cooler