海船船员考试
单选题The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.A increase the refrigerating effect, by decreasing the amount of flash gasB allow the refrigerant to enter the throttling device in a saturated c
题目
increase the refrigerating effect, by decreasing the amount of flash gas
allow the refrigerant to enter the throttling device in a saturated condition
increase the refrigerating effect by increasing the amount of flash gas
minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side
参考答案和解析
相似问题和答案
第1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
第2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
第3题：
If the refrigeration compressor crankcase is sweating, the cause may be due to
A.a shortage of refrigerant
B.the compressor running continuously
C.liquid refrigerant returning to the compressor
D.the compressor short cycling on the high pressure cutout
第4题：
maintain adequate coil back pressure
prohibit flashing in the liquid line
reduce refrigerant volume in the system
reduce compressor discharge line loading
第5题：
a shortage of refrigerant in the system
air in the system
an accumulation of liquid refrigerant in the crankcase
a shortage of oil in the crankcase
第6题：
If liquid refrigerant accidentally comes in contact with the eyes, _____ immediately.
A.rub the eyes
B.irritate the eyes
C.wash the eyes with a heavy boric acid solution
D.obtain medical help
第7题：
Proper refrigerant charge
Faulty expansion valve
Insufficient refrigerant
Solenoid valve stuck open
第8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
第9题：
restriction in refrigerant piping
air and non-condensable gases in the condenser
water in the refrigerant
flooding back of liquid refrigerant from the evaporator
第10题：
too much refrigerant in the system
oil entrained in the refrigerant
less than a full charge of refrigerant in the system
ice crystals forming in the refrigerant