Ref. and Air cond. Tech Unit 2

Question 1

Matter is a substance that occupies space and has

Answer 1

mass

Question 2

Solid, liquid, gas are the most common states of ______

Answer 2

matter

Question 3

In what direction does a solid exert force?

Answer 3

downward

Question 4

In what direction does liquid exert force?

Answer 4

outward and downward

Question 5

Vapor exerts its pressure in what direction?

Answer 5

outward, downward, and upward

Question 6

The weight per unit volume of a substance is defined as

Answer 6

density

Question 7

The density of a substance compared to the density of water is known as

Answer 7

specific gravity

Question 8

The volume occupied by one pound of fluid is known as

Answer 8

specific volume

Question 9

The density of tungsten is 1210lb/ft3. What would be in its specific volume?

Answer 9

1/1210 = 0.000826 ft3/lb

Question 10

The specific volume of red brass is 0.001865 ft3/lb. What would be its density?

Answer 10

1/0.001865 = 536.193029 lb/ft3

Question 11

Aluminum has a density of 171lb/ft3. What would be its specific gravity?

Answer 11

171 lb/ft3 / 62.4 lb/ft3 = 2.740lb/ft3

Question 12

What is the density of water?

Answer 12

62.4lb/ft3

Question 13

Whose law states that the volume of a gas varies inversely with the absolute pressure as long as the temperature remains constant?

Answer 13

Boyles law

Question 14

At a constant pressure, how does a volume of gas vary with respect to the absolute temperature?

Answer 14

it will expand when heated and contract when cold

Question 15

Whose law states that the total pressure of a confined mixture of gases is the sum of the pressures of each of the gases in the mixture?

Answer 15

daltons law

Question 16

What are the two types of energy most frequently used or considered in this industry?

Answer 16

solar and fossil fuels

Question 17

The time rate of doing work is called

Answer 17

power

Question 18

Force x distance =

Answer 18

work

Question 19

If an air conditioning compressor weighing 300lb had to be lifted 4 ft to be mounted on a base, how much work, in ft/lb, must be done?

Answer 19

1200 ft/lb of work

Question 20

How many watts of electrical energy are equal to 1hp?

Answer 20

746W

Question 21

What unit of energy does the power company charge the consumer for?

Answer 21

kilowatt-hour

Question 22

specific volume refers to the volume that

Answer 22

each pound of gas occupies