Refrigeration

Question 1

Convert 32° F to °C.

Answer 1

32°F = 0 °C

Question 2

When piping a refrigeration system which pipe should be insulated?

Answer 2

Suction Line

Question 3

Define refrigeration

Answer 3

The process of transferring heat from a place it is not wanted to a place it is unobjectionable.

Question 4

How many Btu are required to raise one gallon of water from -4 °F to 240°F.

Answer 4

Question 5

What compressor has the fewest moving parts?

Answer 5

Scroll compressor

Question 6

What is the purpose of the distributor on an evaporator coil?

Answer 6

To ensure reasonably uniform flow of refrigerant to each circuit.

Question 7

Between which two points is desuperheating contained?

Answer 7

C-B

Question 8

What state of matter should the refrigerant be leaving the evaporator coil?

Answer 8

Superheated Vapor

Question 9

Name the 4 main components of a refrigeration system?

Answer 9

Compressor

Condenser

Metering device

Evaporator

Question 10

Between which two points is the condenser contained?

Answer 10

E-B

Question 11

Which side of a system is the receiver located, high or low pressure?

Answer 11

High side ( by condenser)

Question 12

Between which two points is subcooling contained?

Answer 12

E-F

Question 13

Where in a system should the sight glass be installed?

Answer 13

Liquid line

Question 14

What is superheat

Answer 14

When a Vapor is heated above its boiling point.

Question 15

Between which two points is the metering device contained?

Answer 15

E-F

Question 16

How is net oil pressure found?

Answer 16

Subtract crankcase pressure from the oil pump discharge pressure.

I didn’t verify this. If it is wrong I’m just gonna get it wrong.

Question 17

What is the purpose of a compressor in a refrigeration system?

Answer 17

Compresses the Vapor, acts as a pump for the system.

Question 18

How is compressor superheated found?

Answer 18

The difference between the actual temp of refrigerant Vapor and the saturation temp.

Question 19

Name 3 ways heat Is transferred.

Answer 19

Conduction

Convection

Radiation

Question 20

Between which two pointsnis the compressor contained?

Answer 20

A-B

Question 21

Name 2 general types of evaporators.

Answer 21

Flooded or Dry ( Direct Expansion)

Question 22

Name name 2 types of flow through a water cooled condenser?

Answer 22

Counter flow and parallel flow.

Question 23

Which type of flow in a water cooled condenser is the most efficient?

Answer 23

Counter flow

Question 24

What happens to the capacity of a system when the suction pressure goes down?

Answer 24

It decreases

Question 25

Convert -40 °C to °F

Answer 25

-40 × 9/5 + 32= -40

-40 x 9/5 = -72

-72 + 32 = -40

Question 26

Between which two points is the evaporator contained

Answer 26

F-A

Question 27

Between which two points is superheat contained?

Answer 27

F-G

Question 28

Name 3 types of compressors

Answer 28

Centrifugal compressor
Scroll compressor
Reciprocating compressor
Hermetic compressor
Semi hermetic compressor

Question 29

Convert 100°C to °F

Answer 29

212 °F

Question 30

How many BTU’s are required to raise 1 ton of water from - 40 steam.

Answer 30

You use the exact same process but you replace the 8.33 lbs for weight with 2000lbs.

Question 31

1 gallon of water weighs how many lbs?

Answer 31

8.33 lbs

Question 32

As a refrigerant is compressed, the _________ and ___________ both rise.

Answer 32

Pressure and Tenperature