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单选题
The effect of high vapor superheat in a refrigeration system, is a/an （）.
A
increased capacity of the compressor
B
more efficient operation of the thermal expansion valve
C
decreased capacity of the compressor
D
loss of receiver capacity
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high pressure vapor lineD
low pressure vapor line
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单选题What separate the high pressure side from the low pressure side in a refrigeration system?（）A
Condenser and thermal expansion valveB
King and solenoid valvesC
Compressor and thermal expansion valveD
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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
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单选题One cause of high head pressure occurring in a refrigeration system can be （）.A
insufficient cooling water flow to the condenserB
a low refrigerant charge in the systemC
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单选题In the refrigeration compressor the temperature of the vapor is （） by compression.A
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单选题It should be ensured that only （） vapor is handled by the refrigeration compressor.A
humidityB
dryC
steamD
oil
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单选题Crankcase sweating in a refrigeration system is caused by （）.A
a stuck solenoid valveB
a shortage of refrigerantC
too much oil in circulationD
too much superheat
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sub-cooled liquidB
high temperature liquidC
oil saturated liquidD
superheated vapor
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单选题The accumulation of air and other non-condensable gases in a refrigeration system will （）.A
cause a loss of the liquid sealB
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suction service valve as a liquidC
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单选题Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.A
liquidB
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单选题Which of the listed statements is correct concerning refrigeration systems?（）A
Dehydrators must be used continuously in a refrigeration systemB
A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hoursC
A thermostatic expansion valve is used to control refrigerated space temperatureD
The liquid receiver functions to collect and remove non- condensable gases
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单选题When the refrigeration demand is small,（）A
the expansion valve will move toward the wide open positionB
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the feeler bulb will conveys the high temperatureD
the superheat degree will raise
考题
单选题Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）A
solenoid valveB
low pressure cutout switchC
king valveD
thermal expansion valve
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单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.A
increase the amount of cooling water to the condenserB
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单选题If you change from a low pour point lubricant to a high pour point lubricant in a refrigeration system, （）.A
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oil will not leave the crankcaseC
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单选题The thermal expansion valve responds to the（）A
amount of superheat in the vapor leaving the coilB
amount of superheat in the liquidC
temperature in the evaporator coilsD
pressure in the evaporator coils
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单选题The sensible heat of air is dependent upon the （）.A
dry bulb temperatureB
wet bulb temperatureC
saturation temperatureD
water vapor superheat
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