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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1.單項(xiàng)選擇題The term "pour point" is defined as the lowest temperature at which lubricating oils will flow ().

A.rapidly
B.by gravity
C.through a standard orifice at a specified temperature
D.at a rate of 60cc per second

2.單項(xiàng)選擇題When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called ().

A.flooding back
B.superheating
C.overflowing
D.recycling

3.單項(xiàng)選擇題What is a function of the wearing rings used in most centrifugal pumps?()

A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the discharge side from the suction side
D.Dampen the turbulent discharge flow

4.單項(xiàng)選擇題If air at 95℃ dry bulb temperature and 50% relative humidity is conditioned to 75℃ dry bulb temperature and 50% relative humidity, it is an example of ().

A.cooling only
B.cooling and humidifying
C.cooling and dehumidifying
D.adiabatic cooling

5.單項(xiàng)選擇題Which of the following descriptions best identifies the operating principal of a flash-type evaporator?()

A.Sea water is heated to boiling temperature while under a vacuum
B.Sea water is passed over heated plates in a thin film
C.Heated sea water is injected into a vacuum chamber
D.Sea water is forced through a heated eductor