RACT Unit 25 Practice Test

Question 1

The two forces that control the EPR valve are the _______________

a) valves spring pressure and liquid line press
b) suction line press and evaporator press
c) liquid line press and suction line press
d) evaporator press and valves spring press

Answer 1

d) evaporator pressure and valves spring pressure

Question 2

Refrigerant relief valves come in two different types, ___________

a) electronic and mechanical
b) spring loaded and electronic
c) mechanical and one-type
d) spring-loaded and one-time

Answer 2

d) spring loaded and one-time

Question 3

A ___________ has a magnetic coil, can be normally open or normally closed, and is frequently used to control fluid flow (liquid or vapour)

a) crankcase pressure regulator
b) evaporator pressure regulator
c) variable frequency drive
d) solenoid valve

Answer 3

d) solenoid valve

Question 4

Pressure switches are used to start and stop electrical current flow to refrigeration components

TRUE OR FALSE

Answer 4

True

Question 5

A control that can be used as either a low-charge protection or to control space temperature is a _________

a) thermostat
b) low-pressure switch
c) high-pressure switch
d) low ambient control

Answer 5

b) low-pressure switch

Question 6

During an automatic pumpdown, the refrigerant is stored in the ________

a) evaporator
b) receiver
c) condenser and receiver
d) evaporator and suction line

Answer 6

c) condenser and receiver

Question 7

A __________ is used to keep the compressor from operating with high head pressure

a) fan-cycling control
b) low-pressure control
c) head pressure regulator
d) high-pressure control

Answer 7

d) high pressure control

Question 8

Net oil pressure is the pressure that can be measured at the discharge or outlet of the oil pump

TRUE OR FALSE

Answer 8

False

Question 9

Any evaporator they operates below 32F _____________

a) should have a check valve at its outlet to keep up pressure during off-cycle
b) requires some form of defrost
c) must have and EPR and a TXV
d) should have a heater in the evaporator to ensure proper oil return

Answer 9

b) requires some form of defrost

Question 10

A __________ can be used to improve the capacity of the evaporator by sub cooling the liquid refrigerant entering it

a) filter drier
b) refrigerant distributor
c) heat exchanger
d) check valve

Answer 10

c) heat exchanger