单选题A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an ().Aevaporator pressure decreaseBevaporator coil over-feedCevaporator capacity increaseDexpansion valve diaphragm rupture
单选题
A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an ().
A
evaporator pressure decrease
B
evaporator coil over-feed
C
evaporator capacity increase
D
expansion valve diaphragm rupture
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When replacing a thermostatic expansion valve sensing bulb, it is necessary toA.apply a light film of oil to increase heat transferB.apply a light film of oil to prevent oxidationC.apply a heavy coating of grease to function as a heat sinkD.carefully coat the device with silicone sealant to reduce the effects of convective cooling
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
单选题During working, thermostatic expansion valve should be ().Aeither all the way open or all the way closedBnormally fully openCthrottled depending on loadDcontrolled by liquefied pressure
单选题The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the ().AcompressorBcooling coilsCcondenserDreceiver
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单选题A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water ().Aaround the engineBaround the coolerCto the expansion tankDoverboard
单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in ()Aa low level in the engine expansion tankBexcessively high coolant pressureCimproper temperaturesDmalfunctioning of the jacket water heater
单选题A ruptured diaphragm in a thermostatic expansion valve will cause the valve to ().AopenBcloseCremain in its positionDflood the evaporator with refrigerant
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单选题What is the function of thermostatic expansion valve in a compression refrigeration system?()AnonexistentBfor controlling pressureCfor controlling superheatDfor controlling the solenoid valve
单选题Thermostatic expansion valve are ().Aeither all the way open or all the way closedBnormally openCthrottled depending on loadDcontrolled by suction pressure
单选题Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?()AThe liquid receiver functions to collect and remove non-condensable gasesBA thermostatic expansion valve is used to control refrigerated space temperatureCRefrigerant temperature in an evaporator is directly related to refrigerant pressureDDehydrators must be used continuously in a refrigeration system
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Which of the following would not cause high suction pressure?()Ainsufficient refrigerationBleaky suction valvesCexpansion valve stuck openDsuction valve not adjusted properly
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
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单选题A cracked diaphragm in a thermostatic expansion valve will cause the valve to ().Areturn to a neutral positionBflood the evaporatorCopenDclose
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