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

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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

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