Unit 1-10 Test (1020)

Question 1

The purpose of a TEV is to maintain a nearly constant _____ with varying loads on the evaporator.

Answer 1

superheat

Question 2

The TEV feeds _____ refrigerant with an increase in load.

Answer 2

more

Question 3

When the coil is flooded with refrigerant, the superheat is:

Answer 3

low

Question 4

When a coil is starved for refrigerant, the superheat is:

Answer 4

high

Question 5

The adjustment stem on a TEV would be turned _____ to increase superheat.

Answer 5

clockwise

Question 6

The TEV sensing bulb is connected to the _____ of the evaporator coil.

Answer 6

outlet

Question 7

Which of the following does not have a direct affect on the TEV’s operation?

Answer 7

Outdoor ambient temperature

Question 8

Which type of system is considered to have a “Critical Charge”?

Answer 8

Cap Tube

Question 9

A restriction in a cap tube can cause the evaporator to _____ when properly charged.

Answer 9

starve

Question 10

A pump down procedure is started when the _____ valve is front seated.

Answer 10

liquid line

Question 11

Which of the following could not be serviced when a system is pumped down?

Answer 11

Condenser

Question 12

What may be used on an air cooled condenser with a fan to prevent the head pressure from becoming too low in mild weather?

Answer 12

Fan cycling or fan speed control (head pressure control system)

Question 13

What does the compressor amperage when the head pressure rises?

Answer 13

Increase

Question 14

What would the head pressure do if the condenser fan motor quit running?

Answer 14

Increase

Question 15

A dirty evaporator coil would cause a ____ superheat.

Answer 15

High

Question 16

An R22 system is operating with a low side pressure of 50 psig and high side pressure of 210 psig. The temperature at the outlet of the evaporator is 38 degrees Fahrenheit. What is the superheat?

Answer 16

12

Question 17

Which type of compressor would not be for residential applications?

Answer 17

Centrifugal

Question 18

A compressor designed so that suction gas flows around and through the motor would be considered primarily air cooled.

True or False?

Answer 18

False

Question 19

Boiling temperature is _____ side pressure converted to temperature.

Answer 19

low

Question 20

Condensing temperature is _____ side pressure converted to temperature.

Answer 20

high

Question 21

A liquid receiver must be used with a capillary tube system.

True or False?

Answer 21

False

Question 22

Which metering device is more economical and has no moving parts?

Answer 22

Cap Tube

Question 23

Low superheat could cause:

Answer 23

both A and B (valve damage in compressor and rod or piston damage in compressor)

Question 24

All TEV’s are adjustable.

True or False?

Answer 24

False

Question 25

The point in an operating cap tube when the pressure drops, and the refrigerant temperature causes the liquid to flash is called the _____ point.

Answer 25

Bubble