单选题The thermal expansion valve reacts directly to the （）Atemperature in the space being cooledBliquid refrigerant pressure at the solenoid valveCpressure drop across the evaporator coilsDrefrigerant gas superheat at the coil outlet
单选题
The thermal expansion valve reacts directly to the （）
A
temperature in the space being cooled
B
liquid refrigerant pressure at the solenoid valve
C
pressure drop across the evaporator coils
D
refrigerant gas superheat at the coil outlet
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单选题The bulb for the thermal expansion valve is located（）Ain the middle of evaporator coilsBnear the evaporator coil outletCnear the evaporator coil inletDon the bottom row of evaporator coils
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单选题What separate the high pressure side from the low pressure side in a refrigeration system?（）ACondenser and thermal expansion valveBKing and solenoid valvesCCompressor and thermal expansion valveDCondenser and solenoid valve
单选题The thermal expansion valve reacts directly to the （）Atemperature in the space being cooledBliquid refrigerant pressure at the solenoid valveCpressure drop across the evaporator coilsDrefrigerant gas superheat at the coil outlet
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单选题（） pistons have low inertia and high coefficient of thermal expansion.ACast ironBCast steelCForged steelDAluminum
单选题When the heat load begins to increase, the needle valve of an expansion valve will（）Amove in an opening directionBmove in a closing directionCeither open or closeDnot move at all
单选题A solenoid valve used in a refrigeration system should be installed （）.Awith the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valveBupright, sensing temperature of the box, and upstream of the thermal expansion valveCupright, sensing temperature of the box, and downstream of the thermal expansion valveDupright, sensing heat of the tail coil, and upstream of the thermal expansion valve
单选题A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.Areturn to a neutral positionBflood the evaporatorCopenDclose
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 （）.Aincrease the capacity of the coilBincrease the superheat at the bulbCdeliver more refrigerant to the coilDdecrease the capacity of the coil
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