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Badly leaking refrigeration compressor discharge valves will cause ______.
A.overfeeding of the expansion valve
B.damage to the condenser
C.constant running of the compressor
D.flooding of the receiver
参考答案
更多 “ Badly leaking refrigeration compressor discharge valves will cause ______.A.overfeeding of the expansion valveB.damage to the condenserC.constant running of the compressorD.flooding of the receiver ” 相关考题
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If the refrigeration compressor crankcase is sweating, the cause may be due toA.a shortage of refrigerantB.the compressor running continuouslyC.liquid refrigerant returning to the compressorD.the compressor short cycling on the high pressure cutout
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If the suction pressure at the refrigeration compressor is below normal, the cause can beA.refrigerant overchargeB.overfeeding by the expansion valveC.a restricted suction strainerD.due to short cycling of the compress
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The sensing line for the low pressure cutout switch to a refrigeration system is located ______.A.in the chill box(冰箱)B.before the receiverC.on the suction side of the compressorD.on the discharge side of the compressor
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If the suction pressure for an operating refrigeration compressor is below normal, the cause may be ______.A.an excess of liquid refrigerantB.the expansion valve overfeedingC.a fouled compressor suction strainerD.the compressor short cycling
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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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What is the most probable cause of reduced capacity in a reciprocating air compressor ________．A.Carbon on cylinder headsB.Faulty unloaderC.Leaking air valvesD.Plugged air cooler
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单选题Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）A
Closing of the solenoid valveB
Closing of the expansion valveC
An increase in the suction pressureD
Decreasing the suction pressure
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
考题
单选题If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.A
system was overcharged with refrigerantB
high pressure switch was improperly adjustedC
expansion valve strainers were fouledD
suction valves were leaking slightly
考题
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If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.A
system was overcharged with refrigerantB
system was low on refrigerantC
suction valves were leaking slightlyD
relief valve was leaking slightly
考题
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
考题
单选题Badly leaking refrigeration compressor discharge valves will cause（）.A
overfeeding of the expansion valveB
damage to the condenserC
constant running of the compressorD
flooding of the receiver
考题
单选题If the discharge valves on a refrigeration compressor are leaking badly, the compressor should （）.A
run continuouslyB
not startC
have high discharge pressureD
short cycle on the high pressure switch
考题
单选题The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch， One reason for this could be the （）.A
system is low on refrigerantB
high pressure cutout switch is improperly adjustedC
discharge valves are leaking slightlyD
discharge valves are leaking excessively
考题
单选题If a refrigeration compressor will not start, the reason may be （）.A
the pressure regulating valve is not closingB
an excessive lack of refrigerant in the systemC
badly leaking discharge valvesD
worn piston rings
考题
单选题If the refrigeration compressor crankcase is sweating, the cause may be due to （）.A
a shortage of refrigerantB
the compressor running continuouslyC
liquid refrigerant returning to the compressorD
the compressor short cycling on the high pressure cutout
考题
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
考题
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The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）A
system is overcharged with refrigerantB
system is low on refrigerantC
discharge valves are leaking excessivelyD
discharge valves are leaking slightly
考题
单选题Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.A
compressor damage from improper lubricationB
refrigerant absorption by the lubricantC
increased viscosity in the lubricantD
carbon deposit on the compressor suction valves
考题
单选题Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? （） (1) faulty condensing (2) too few refrigerant (3) high discharge pressureA
any of (1) and (3)B
any of (1) and (2)C
any of (2) and (3)D
any of (1), (2) and (3)
考题
单选题The purpose of the refrigeration system low pressure cutout switch is to （）A
protect the compressor from liquid flood backB
protect the compressor from low discharge pressureC
start and stop the compressor upon system demandD
start the compressor after a drop in the evaporator pressure
考题
单选题An increase in the heat load to a refrigeration system will cause （）.A
the suction pressure to decreaseB
the suction temperature to increaseC
increased ice formation on the evaporator coilD
excessive short cycling of the compressor
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Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.A
leaky discharge valves on the LP cylinderB
leaky discharge valves on the HP cylinderC
insufficient intercooler coolingD
low ambient air pressure
考题
单选题Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）A
Thermal expansion valve frozen openB
Suction gas heat exchanger bypassedC
Condenser clogged or fouledD
High pressure cutout switch inoperative
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