The device installed to prevent liquid refrigerant from returning to the compressor during system operation
is the _____.
a. filter-drier
b. evaporator pressure regulator
c. crankcase heater
d. suction line accumulator
[Ques. 2] A device used to prevent the reverse flow of a liquid is a(n) _____.
a. flow switch
b. pressure-relief valve
c. check valve
d. evaporator pressure regulator
[Ques. 3] To close the control circuit and start a system, a remote bulb thermostat depends on a _____.
a. bimetal strip that expands or contracts
b. refrigerant-filled bulb that responds to temperature changes
c. mercury-filled bulb that responds to temperature changes
d. thermocouple that changes its resistance as the temperature changes
[Ques. 4] Which of the following control devices is often used in both a primary and a secondary control role?
a. Pressure switches
b. Humidistats
c. Rupture disks
d. Condenser water valves
[Ques. 5] Which of the following metering devices responds to changes in the superheat of the refrigerant vapor
leaving the evaporator?
a. Low-side float valve
b. High-side float valve
c. Automatic expansion valve
d. Thermostatic expansion valve
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