Refrigeration Theory

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Question 1

Temperature is

A	The intensity of molecular motion
B	The measurement of heat in a liquid
C	. The measurement of heat in a gas
D	The measurement of heat in an object

Question 2

What are four common temperature scales?

A	Rankine, Fahrenheit, Celsius, and Centigrade
B	. Centigrade, Fahrenheit, Celsius, and Kelvin
C	Fahrenheit, Rankine, Celsius, and Kelvin
D	Absolute, Kelvin, Centigrade, and Fahrenheit

Question 3

Which of the following is the U.S. conventional standard scale?

A	Fahrenheit
B	Kelvin
C	Rankine

Question 4

Which of the following is the U.S. conventional absolute zero scale?

A	Centigrade
B	Fahrenheit
C	Kelvin
D	. Rankine

Question 5

Which temperature scale freezes water at 32 degrees, and boils water at 212 degrees?

A	Centigrade
B	Fahrenheit
C	Kelvin
D	Rankine

Question 6

To convert Fahrenheit to Rankine

A	Subtract 273 F
B	Add 273 F
C	Subtract 460 F
D	Add 460 F

Question 7

Which of the following is the SI unit standard scale?

A	Celsius
B	Fahrenheit
C	Kelvin
D	Rankine

Question 8

Which of the following is the SI unit absolute zero scale?

A	Centigrade
B	Fahrenheit
C	Kelvin
D	Rankine

Question 9

Which temperature scale freezes water at 0 degrees, and boils water at 100 degrees?

A	Centigrade
B	Fahrenheit
C	Kelvin
D	Rankine

Question 10

To convert Celsius to Kelvin

A	Subtract 273 degrees
B	Add 273 degrees
C	Subtract 460 degrees
D	Add 460 degrees

Question 11

To convert Celsius to Fahrenheit, which of the following is the correct formula?

A	(1.8 X C) + 32 = F
B	(1.8 – C) + 32 = F
C	(1.8 + C) – 32 = F
D	(1.8 X C) – 32 = F

Question 12

To convert Fahrenheit to Celsius, which of the following is the correct formula?

A	.56 X (F – 32) = C
B	.56 X (F + 32) = C
C	.56 – (F X 32) = C
D	.56 + (F X 32) = C

Question 13

What is the definition of specific heat?

A	The heat that can be measured by a thermometer
B	The amount of heat required to raise 1 lb of water 1 F
C	The amount of heat required to raise 1 lb of a substance 1 F
D	The heat used to cause a change of state

Question 14

What is the definition of sensible heat

A	The heat that can be measured by a thermometer
B	The amount of heat required to raise 1 lb of water 1 F
C	The amount of heat required to raise 1 lb of a substance 1 F
D	The heat used to cause a change of state

Question 15

What is the definition of latent heat?

A	The heat that can be measured by a thermometer
B	The amount of heat required to raise 1 lb of water 1 F
C	The amount of heat required to raise 1 lb of a substance 1 F
D	The heat used to cause a change of state

Question 16

What is the definition of a Btu

A	The heat that can be measured by a thermometer
B	The amount of heat required to raise 1 lb of water 1F
C	The amount of heat required to raise 1 lb of a substance 1 F
D	The heat used to cause a change of state

Question 17

Heat energy is measured

A	By a thermometer
B	By the temperature difference of a substance
C	In Btu’s
D	By the thermal mass of a substance

Question 18

To measure the amount of heat in a substance without the change of state, which formula is correct?

A	Temperature X weight X volume
B	Temperature X density X volume
C	. Specific heat X temperature difference X weight
D	Specific heat X volume X temperature difference

Question 19

If 2 lb of water are raised from 40 to 60 F, how many Btu’s are added to the water?

A	20
B	30
C	40
D	60

Question 20

The amount of heat that it takes to change 1 lb of 212 F water to 212 F steam is?

A	144 Btu’s
B	200 Btu’s
C	746 Btu’s
D	970 Btu’s

Question 21

The amount of heat required to change 1 lb of 32 F ice to 1 lb of 32 F water is?

A	144 Btu’s
B	200 Btu’s
C	746 Btu’s
D	970 Btu’s

Question 22

The three states of matter are?

A	Solid, vapor, and gas
B	Solid, liquid, and gas
C	Solid, fluid, and liquid
D	Fluid, vapor, and solid

Question 23

Boyle’s law states that

A	At a constant pressure, the volume of a gas varies directly with an absolute temperature
B	The total pressure of a confined mixture of gases is the sum of the pressures of each of the gases in the mixture
C	The volume of a gas varies indirectly with an absolute temperature.
D	A volume of gas varies inversely with the absolute pressure, if the temperature remains constant

Question 24

Charles law states that

A	At a constant pressure, the volume of a gas varies directly with an absolute temperature
B	The total pressure of a confined mixture of gases is the sum of the pressures of each of the gases in the mixture
C	The volume of a gas varies indirectly with an absolute temperature.
D	A volume of gas varies inversely with the absolute pressure, if the temperature remains constant

Question 25

Dalton’s law states that

A	At a constant pressure, the volume of a gas varies directly with an absolute temperature
B	The total pressure of a confined mixture of gases is the sum of the pressures of each of the gases in the mixture
C	The volume of a gas varies indirectly with an absolute temperature.
D	A volume of gas varies inversely with the absolute pressure, if the temperature remains constant

Question 26

The calculation for work is

A	Time X distance
B	Mass X force
C	Force X distance
D	Force X rate

Question 27

One horse power is equal to

A	33,000 ft lb of work in 1 min
B	12,000 ft lb of work in 1 min
C	746 ft lb of work in 1 min
D	200 ft lb of work in 1 min

Question 28

One horse power is equal to

A	33,000 watts
B	746 watts
C	200 watts
D	3.41 watts

Question 29

One watt is equal to

A	33,000 Btu
B	746 Btu
C	200 Btu
D	3.41 Btu

Question 30

Which method of heat transfer is known as conduction?

A	The transfer of heat from liquids to vapor
B	The transfer of heat from one molecule to another
C	The transfer of heat from one place to another by a fluid, commonly air or water
D	The transfer of heat from the heat source to a solid object through space

Question 31

Which method of heat transfer is known as convection?

A	The transfer of heat from liquids to vapor
B	The transfer of heat from one molecule to another
C	The transfer of heat from one place to another by a fluid, commonly air or water
D	The transfer of heat from the heat source to a solid object through space

Question 32

Which method of heat transfer is known as radiation?

A	The transfer of heat from liquids to vapor
B	The transfer of heat from one molecule to another
C	The transfer of heat from one place to another by a fluid, commonly air or water
D	The transfer of heat from the heat source to a solid object through space

Question 33

One ton of refrigeration is

A	33,000 btu per hour
B	12,000 btu per hour
C	746 btu per hour
D	200 btu per hour

Question 34

What type of heat is absorbed or extracted from a substance when the substance changes state?

A	Specific heat
B	Latent heat
C	Sensible heat
D	Superheat

Question 35

When a substance changes from a liquid to a gas, this is known as

A	Latent heat of condensation
B	Sensible heat of a vapor
C	Latent heat of sublimation
D	Latent heat of vaporization

Question 36

When a substance changes from a gas to a liquid, this is known as

A	Latent heat of condensation
B	Sensible heat of a vapor
C	Latent heat of sublimation
D	Latent heat of vaporization

Question 37

When a substance changes from a solid to a gas this is known as

A	Latent heat of condensation
B	Sensible heat of a vapor
C	Latent heat of sublimation
D	Latent heat of vaporization

Question 38

In a refrigeration system, heat is absorbed by

A	The latent heat of condensation in the condenser
B	The latent heat of vaporization in the evaporator
C	The latent heat of vaporization in the condenser
D	The latent heat of condensation in the evaporator

Question 39

In a refrigeration system, heat is rejected by

A	The latent heat of condensation in the condenser
B	The latent heat of vaporization in the evaporator
C	The latent heat of vaporization in the condenser
D	The latent heat of condensation in the evaporator

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Refrigeration Theory

Refrigeration Theory

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