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单选题
During working, thermostatic expansion valve should be （）.
A
either all the way open or all the way closed
B
normally fully open
C
throttled depending on load
D
controlled by liquefied pressure
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单选题Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）A
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单选题A solenoid valve used in a refrigeration system should be installed （）.A
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upright, sensing temperature of the box, and downstream of the thermal expansion valveD
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单选题A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.A
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考题
单选题The thermostatic valve has a throttling action, that is to say the valve can（）A
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单选题Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）A
At the designed operating temperature, the liquid refrigerant charge has changed to a vaporB
The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivityC
The sensing bulb is empty of liquid refrigerant charge at the designed operating temperatureD
The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
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单选题When the refrigeration demand is small,（）A
the expansion valve will move toward the wide open positionB
the expansion valve will move toward the closing positionC
the feeler bulb will conveys the high temperatureD
the superheat degree will raise
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单选题After passing through the expansion valve the refrigerant should be in the state of （）.A
vaporB
liquidC
solidD
None of the above is tree
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单选题To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to （）.A
re-adjust the discharge pressureB
clean the expansion valve screenC
add refrigerantD
adjust the expansion valve
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单选题The low pressure side of a refrigeration system is considered to exist from the （）.A
expansion valve to the compressorB
receiver to the expansion coilC
expansion valve to the evaporatorD
condenser to the expansion valve
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low differential setting on the H-PcutoutC
blown fuse in the motor circuitD
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