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An increase in the heat load to a refrigeration system will cause ______.
A.the suction pressure to decrease
B.the suction temperature to increase
C.increased ice formation on the evaporator coil
D.excessive short cycling of the compressor
参考答案
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an electric system managerB
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condenserC
expansion valveD
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单选题What is the purpose of sub cooling R-12 in the condenser?（）A
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to stop the liquid from flashingC
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单选题In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.A
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condenserC
receiverD
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单选题Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）A
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Closing of the expansion valveC
An increase in the suction pressureD
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单选题Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）A
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Heat of compressionC
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opening a drain petcock on the oil separatorC
condensing the water in the heat exchangerD
using a dehydrator cartridge
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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
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condensing refrigerant in the system condenserC
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单选题What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.A
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单选题If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.A
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单选题An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.A
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the compressor to run continuously
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单选题Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.A
compressor damage from improper lubricationB
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单选题Moisture in a refrigeration system can cause （）.A
freezing the expansion valve closedB
corrosion of system pipingC
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单选题When the heat load begins to increase, the needle valve of an expansion valve will（）A
move in an opening directionB
move in a closing directionC
either open or closeD
not move at all
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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
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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
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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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