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單項(xiàng)選擇題

When a refrigeration compressor motor fails to start, the FIRST thing that should be checked for is a （）.

A.loose expansion valve control bulb
B.low differential setting on the H-Pcutout
C.blown fuse in the motor circuit
D.faulty suction pressure regulator

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單項(xiàng)選擇題

The purpose of the wearing rings used in a centrifugal pump is to （）.

A.prevent an internal explosion in the pump when it is overheated
B.enable a visual inspection of the pump while it is running
C.insure a proper alignment of the pump coupling to the driver
D.accommodate for friction between the impeller and the easing

單項(xiàng)選擇題

The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called （）.

A.explosive range
B.flash point
C.ignition temperature
D.combustion temperature

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