海船船员考试

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

题目
单选题
“Flooding back” is a condition where the liquid refrigerant （）.
A

vaporizes in the condenser

B

reaches the compressor through the suction line

C

flashes in the liquid line

D

condenses in the receiver

参考答案和解析
正确答案： A
解析： 暂无解析
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相似问题和答案

第1题：

单选题
A positive displacement pump is that where the volume of the pump chamber is alternately increased to （） and then decreased to （）.
A

draw the liquid in；force the liquid out

B

force the liquid out；draw the liquid in

C

suction；draw

D

deliver；outlet


正确答案： C
解析： 暂无解析

第2题：

单选题
A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.
A

a shortage of refrigerant in the system

B

air in the system

C

an accumulation of liquid refrigerant in the crankcase

D

a shortage of oil in the crankcase


正确答案： C
解析： 暂无解析

第3题：

To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the_______ .

A.suction service valve as a vapor

B.suction service valve as a liquid

C.discharge service valve as a vapor

D.charging valve as a liquid


正确答案：A

第4题：

单选题
A pressure drop through the refrigerant liquid line may cause （）.
A

solenoid valve to seize

B

compressor to hunt

C

formation of flash gas in the liquid line

D

expansion valve to freeze open


正确答案： B
解析： 暂无解析

第5题：

单选题
Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.
A

maintain adequate coil back pressure

B

prohibit flashing in the liquid line

C

reduce refrigerant volume in the system

D

reduce compressor discharge line loading


正确答案： A
解析： 暂无解析

第6题：

单选题
Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）
A

Proper refrigerant charge

B

Faulty expansion valve

C

Insufficient refrigerant

D

Solenoid valve stuck open


正确答案： C
解析： 暂无解析

第7题：

单选题
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
A

restriction in refrigerant piping

B

air and non-condensable gases in the condenser

C

water in the refrigerant

D

flooding back of liquid refrigerant from the evaporator


正确答案： C
解析： 暂无解析

第8题：

If the superheat value of a thermostatic expansion valve is set too low, the _.

A.the suction line will be abnormally cold and liquid may slug back to the compressor

B.the suction line will be hot due to a reduced amount of refrigerant returning to the compressor

C.the temperature of the refrigerant within the condenser will remain the same

D.the temperature of the refrigerant passing through the sub-cooler will decrease


正确答案：A

第9题：

单选题
If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.
A

too much refrigerant in the system

B

oil entrained in the refrigerant

C

less than a full charge of refrigerant in the system

D

ice crystals forming in the refrigerant


正确答案： A
解析： 暂无解析

第10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 oil

B

liquid refrigerant flooding the compressor and system

C

lube oil viscosity being reduced by refrigerant dilution

D

compressor suction pressure suddenly increasing


正确答案： C
解析： 暂无解析

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