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单选题The saturation temperature of the refrigerant must be （） that required in the evaporator refrigerated space.A aboveB belowC equal toD None of the above

题目
单选题
The saturation temperature of the refrigerant must be （） that required in the evaporator refrigerated space.
A

above

B

below

C

equal to

D

None of the above

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相似问题和答案

第1题：

Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its ______.

A.freezing point

B.floc point(浊点)

C.condensing temperature

D.compression temperature


正确答案：C

第2题：

单选题
When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be （）.
A

dry

B

wet

C

super-cooled

D

superheated


正确答案： C
解析： 暂无解析

第3题：

The temperature of the refrigerant in the evaporator coil depends mostly upon the ___.

A.refrigerant pressure in the evaporator

B.cooling water temperature to the condenser

C.heat load in the refrigerator compartment

D.solenoid valve in the liquid line


正确答案：A

第4题：

单选题
If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.
A

a shortage of compressor oil

B

warm food in the refrigerator

C

excessive condenser cooling water

D

a shortage of refrigerant


正确答案： A
解析： 暂无解析

第5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6题：

Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.

A.carbon deposits on the compressor suction valves

B.the evaporator temperature to increase

C.rapid corrosion of the thermal expansion valve

D.no operating problems


正确答案：B

第7题：

单选题
When you adjust a thermostatic expansion valve, （）.
A

refrigerant must be bled off the sensing line before adjustments are made

B

all refrigerant must be pumped into the receiver before adjustments are made

C

time must be allowed for conditions to stabilize in the evaporator before further adjustments are made

D

all refrigerant must be routed through the dehydrator while changing the superheat setting


正确答案： B
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
Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.
A

the more

B

the higher

C

the lower

D

the highest


正确答案： B
解析： 暂无解析

第10题：

单选题
In a vacuum distillation system, the case is the higher the pressure, （）.
A

the saturation temperature is higher

B

the higher the saturation temperature

C

the higher is the saturation temperature

D

the saturation temperature is more high


正确答案： A
解析： 暂无解析

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