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单选题
The compressor suction line conveys the refrigerant vapor from （） to （）.
A
condenser；evaporator
B
evaporator；compressor
C
compressor；condenser
D
None of the above
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考题
单选题The device, which is installed in the compressor suction line to prevent liquid from entering the compressor when hot gas defrosting, is called a（）A
re-evaporatorB
receiverC
dehydratorD
solenoid
考题
单选题When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.A
flooding backB
superheatingC
overflowingD
recycling
考题
单选题Insufficient refrigerant in a refrigeration plant may result in （）.A
high discharge pressureB
frosting of the crankcaseC
high temperature of the overboard waterD
low suction pressure of compressor
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单选题If a refrigeration system were short of refrigerant, the condition would result in （）.A
continuous running of the compressorB
high suction pressureC
high discharge pressureD
short cycling of the compressor on the water failure switch
考题
单选题When the relief valve opens it discharges high pressure refrigerant vapor to the （）.A
liquid strainerB
refrigerant inlet of the condenserC
inlet side of the evaporatorD
suction side of the compressor
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单选题Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.A
maintain adequate coil back pressureB
prohibit flashing in the liquid lineC
reduce refrigerant volume in the systemD
reduce compressor discharge line loading
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单选题A warmer than normal compressor suction line might be caused by （）.A
insufficient lubricationB
insufficient refrigerantC
excess refrigerantD
excessive opening of the expansion valve
考题
单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.A
the relief valve should open before the high pressure cutoutB
the relief valve should open and allow the excess refrigerant to flow to the receiverC
the high pressure cutout switch should operate before the relief valve opensD
you should close in on the suction valve
考题
单选题Foaming of the oil in a refrigeration compressor crankcase is caused by （）.A
refrigerant boiling out of solution from the lube oilB
liquid refrigerant flooding the compressor and systemC
lube oil viscosity being reduced by refrigerant dilutionD
compressor suction pressure suddenly increasing
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单选题If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.A
refrigerant overchargeB
overfeeding by the expansion valveC
a restricted suction strainerD
due to short cycling of the compressor
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单选题In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.A
increasing refrigerant pressure in the coilB
increasing chilled water flow through the coolerC
sub-cooling the refrigerant in the condenserD
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单选题An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.A
oil foaming in the compressorB
higher than normal suction and discharge pressures with a higher box temperatureC
higher than normal discharge pressure with a normal box temperatureD
the compressor to run continuously
考题
单选题Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.A
liquidB
dry saturated gasC
wet saturated gasD
superheated vapor
考题
单选题The sensing line for the low pressure cutout switch to a refrigeration system is located （）.A
in the chill boxB
before the receiverC
on the suction side of the compressorD
on the discharge side of the compressor
考题
单选题“Flooding back” is a condition where the liquid refrigerant （）.A
vaporizes in the condenserB
reaches the compressor through the suction lineC
flashes in the liquid lineD
condenses in the receiver
考题
单选题The purpose of the low pressure cut-out switch is to （）.A
maintain liquid refrigerant at the suction of the compressorB
maintain a preset suction pressure to the compressorC
start and stop the compressor at preset operating pressuresD
operate at minimum efficiency
考题
单选题A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the （）.A
condition of the expansion valveB
moisture in the systemC
condition of the compressor suction valvesD
condenser temperature
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单选题Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.A
carbon deposits on the compressor suction valvesB
the evaporator temperature to increaseC
rapid corrosion of the thermal expansion valveD
no operating problems
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