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单选题
In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the（）
A
pressurestat
B
high pressure cutout
C
solenoid valve
D
low pressure cutout switch
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nonexistentB
for controlling pressureC
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overfeeding of the expansion valveB
damage to the condenserC
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单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by （）.A
passing it through the expansion valveB
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单选题Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）A
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单选题What separate the high pressure side from the low pressure side in a refrigeration system?（）A
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Compressor and thermal expansion valveD
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单选题When the refrigeration demand is small,（）A
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单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to （）.A
change the expansion valve adjustmentB
readjust the water regulating valve to increase the flow of waterC
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单选题Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）A
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单选题The low pressure side of a refrigeration system is considered to exist from the （）.A
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单选题Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）A
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The king valve and the solenoid valveC
The compressor and the expansion valveD
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考题
单选题A pressure drop in the liquid line of a refrigeration system may cause（）A
the solenoid valve to seizeB
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flash gas to form in the liquid lineD
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