Quiz 6

Question 1

The Fahrenheit scale is based on boiling water having a sea level temperature of?

Answer 1

212

Question 2

Zero pounds gauge pressure corresponds to an absolute scale reading of?

Answer 2

14.696

Question 3

Hidden heat in refrigeration work is referred to as?

Answer 3

Latent heat

Question 4

Absolute zero on the Fahrenheit scale equals?

Answer 4

-460

Question 5

The heat used to change a liquid to a gas is called the latent heat of?

Answer 5

Vaporization

Question 6

A thermometer is used to measure?

Answer 6

Sensible heat

Question 7

Which of the following causes a change of state of a substance?

Answer 7

Latent heat

Question 8

Heat transfer flows from a material at a higher temperature to a lower temperature

Answer 8

True

Question 9

The amount of heat required to raise the temperature of one pound of a substance one degree Fahrenheit is?

Answer 9

Specific heat

Question 10

Convert 75 degrees Celsius to Fahrenheit

Answer 10

F = (1.8 x C) + 32

167 F

Question 11

Convert 87 degrees Fahrenheit to Celsius

Answer 11

C = .555 x (F -32)

30.525 C

Question 12

Convert -40 degrees Celsius to Fahrenheit

Answer 12

F = (1.8 x C) + 32
-40 F

Question 13

Heat being a form of energy cannot be ________

Answer 13

Destroyed

Question 14

Ice will begin to melt when it’s sensible temperature rises above

Answer 14

32 F

Question 15

Name the three states most elements and compounds may exist in

Answer 15

Solid, gas, liquid

Question 16

The device/unit used to measure the quantity of heat is the

Answer 16

BTU

Question 17

The instrument used to measure the intensity or level of heat is called

Answer 17

Thermometer

Question 18

Heat transfer will exist between two objects of the same temperature

Answer 18

False

Question 19

The boiling point of water on the Celsius scale at sea level is

Answer 19

100 C

Question 20

Atmospheric pressure would be greater on a mountain top compared to its pressure at seal level

Answer 20

True

Question 21

Approximately how many inches of mercury are equal atmospheric pressure at sea level under standard conditions

Answer 21

29.92 in HG

Question 22

Definition of a substance that takes up space and has weight

Answer 22

Matter

Question 23

In which direction does a solid exert pressure

Answer 23

Downward

Question 24

In which direction does a liquid exert pressure

Answer 24

Downward and outward

Question 25

In which direction does a gas exert pressure

Answer 25

All directions

Question 26

Heat is considered a form of energy

Answer 26

True

Question 27

Magnetism is considered a form of energy

Answer 27

True

Question 28

Electricity is purchased from the utility company and measured by the

Answer 28

Kilo-hour

Question 29

One kilowatt (KW) equals _____ BTUs

Answer 29

3413

Question 30

How many watts of electrical energy equals one horsepower

Answer 30

746

Question 31

There are three quantities needed to determine horsepower. They are weight/force, distance, and _____

Answer 31

Time

Question 32

Referring to manifold gauges, the low side gauge divisions are calculated in

Answer 32

Five pound increments

Question 33

Also referring to manifold gauges, the high side gauge division are calibrated in

Answer 33

Five pound increments

Question 34

This gauge reads pressures above and below atmospheric pressure

Answer 34

Low sided gauge

Question 35

Bonus. It would take ________ horsepower motor to lift a 2000 pound condensing unit 30 feet in 30 seconds

Answer 35

Force = Mass x Acceleration (32.2 ft/s) 2000 x 32.2 = 64400 lb ft/s 64400 x 30 ft = 1932000 lb ft Work = 1932000 Time = 30 seconds HP = 1932000 / (30s x 550) HP = 117.85