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单选题
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
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考题
The temperature of the refrigerant in the evaporator coil depends mostly upon the ___.A.refrigerant pressure in the evaporatorB.cooling water temperature to the condenserC.heat load in the refrigerator compartmentD.solenoid valve in the liquid line
考题
A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/anA.evaporator pressure decreaseB.evaporator coil over-feedC.evaporator capacity increaseD.expansion valve diaphragm rupture
考题
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 compressorB.the suction line will be hot due to a reduced amount of refrigerant returning to the compressorC.the temperature of the refrigerant within the condenser will remain the sameD.the temperature of the refrigerant passing through the sub-cooler will decrease
考题
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
考题
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
dryB
wetC
super-cooledD
superheated
考题
单选题A refrigerant boils and vaporizes in the （） in a compression refrigeration system.A
liquid receiverB
compressorC
condenserD
cooling coil
考题
单选题The refrigerant flows through the evaporator, where it （） heat from the refrigerated space.A
extractsB
releasesC
gives noD
absorbs no
考题
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 pipingB
air and non-condensable gases in the condenserC
water in the refrigerantD
flooding back of liquid refrigerant from the evaporator
考题
单选题Refrigerant is normally sub-cooled in a refrigeration or air conditioning system condenser to （）.A
maintain adequate coil back pressureB
prohibit flashing in the liquid lineC
reduce refrigerant volume in the systemD
reduce compressor discharge line loading
考题
单选题The heat gained per pound of refrigerant in the evaporator is known as the（）.A
latent heat of vaporizationB
sensible heatC
refrigerating effectD
specific heat of vaporization
考题
单选题The bulb for the thermal expansion valve is located（）A
in the middle of evaporator coilsB
near the evaporator coil outletC
near the evaporator coil inletD
on the bottom row of evaporator coils
考题
单选题Because the expansion valve is just （） way open, the refrigerant is under low pressure in the evaporator.A
littleB
fewC
a littleD
a few
考题
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
考题
单选题Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）A
The liquid receiver functions to collect and remove non-condensable gasesB
A thermostatic expansion valve is used to control refrigerated space temperatureC
Refrigerant temperature in an evaporator is directly related to refrigerant pressureD
Dehydrators must be used continuously in a refrigeration system
考题
单选题A refrigerant gives up heat when it goes through （）.A
condenserB
regurgitateC
evaporatorD
boil coil
考题
单选题A refrigerant with oil in solution has a （）.A
higher boiling temperature for a given pressure than does a pure refrigerantB
lower boiling temperature for a given pressure than does a pure refrigerantC
boiling pressure equal to that of a pure refrigerant at a given pressureD
boiling point will not be affected by entrained oil
考题
单选题In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）A
its pressure and temperature are both loweredB
its pressure and temperature are both raisedC
its pressure is lowered and its temperature is raisedD
its pressure is raised and its temperature is lowered
考题
单选题Both the temperature and the pressure of the refrigerant are increased in the （）.A
compressorB
condenserC
evaporatorD
expansion valve
考题
单选题The thermal expansion valve reacts directly to the （）A
temperature in the space being cooledB
liquid refrigerant pressure at the solenoid valveC
pressure drop across the evaporator coilsD
refrigerant gas superheat at the coil outlet
考题
单选题The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.A
sub-cooled liquidB
high temperature liquidC
oil saturated liquidD
superheated vapor
考题
单选题The refrigerating agent can （） at low temperature in the evaporator.A
expandB
evaporateC
condenseD
distil
考题
单选题If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.A
increase the capacity of the coilB
increase the superheat at the bulbC
deliver more refrigerant to the coilD
decrease the capacity of the coil
考题
单选题In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly （）.A
saturatedB
super-cooledC
wetD
superheated
考题
单选题Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its （）.A
freezing pointB
floc pointC
condensing temperatureD
compression temperature
考题
单选题Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）A
solenoid valveB
low pressure cutout switchC
king valveD
thermal expansion valve
考题
单选题If the compressor-discharge temperature is higher than the receiver temperature（）A
increase the amount of cooling water to the condenserB
decrease the amount of cooling water to the condenserC
add more refrigerant to the systemD
remove some of the refrigerant from the system
考题
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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