單項(xiàng)選擇題With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? ()

A.Single stage or multistage
B.High pressure or low pressure
C.Open or close coupled
D.Horizontal or vertical


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1.單項(xiàng)選擇題If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be ().

A.contaminated fluid
B.pitted thrust rings
C.worn pintle bearings
D.obstructed suctions passage

2.單項(xiàng)選擇題To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the ().

A.shaft and impeller
B.motor and pump shaft
C.casing and impeller wearing rings
D.lantern ring and impeller

3.單項(xiàng)選擇題In a radial piston pump, reversal and control of fluid flow are accomplished by moving the ().

A.central valve
B.radial plunger
C.floating ring
D.cylinder body

4.單項(xiàng)選擇題Increasing the moisture content of conditioned air is known as ().

A.moisturizing
B.dehumidification
C.dampening
D.humidification

5.單項(xiàng)選擇題A reciprocating air compressor is running roughly and vibrating excessively, indicating that the ().

A.compressor is overloaded
B.motor is overloaded
C.foundation bolts are loose
D.belts are too tight

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If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().

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If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().

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The rate of heat transfer from a hot region to a cold region is affected most by the ().

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If the head pressure of a reciprocating refrigeration compressor is excessive, ().

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If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should ().

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The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().

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One cause of high head pressure occurring in a refrigeration system can be ().

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An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().

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The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?()

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A pressure drop through the refrigerant liquid line may cause ().

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