unit 2 review(book

Question 1

matter is a substance that occupies space and has
a. color
b. texture
c. temperature
d. mass

Answer 1

d. mass

Question 2

solid, liquid, and gas are the most common
a. states of matter
b. specific volumes
c. gravitational forces
d. fossil fuels

Answer 2

a. states of matter

Question 3

in what direction does a solid exert force
a. outward
b. upward
c. downward
d. outward, upward, downward

Answer 3

c. downward

Question 4

in what direction does a liquid exert force
a. outward
b. upward
c. downward
d. downward and outward

Answer 4

d. downward and outward

Question 5

vapor exerts pressure in what direction
a. outward
b. upward
c. downward
d. outward, upward, downward

Answer 5

d. outward, upward, downward

Question 6

the weight per unit volume of a substance is defined as
a. mass
b. density
c. work
d. specific gravity

Answer 6

b. density

Question 7

the density of a substance compared to the density of water is known as
a. specific gravity
b. specific volume
c. mass
d. weight

Answer 7

a. specific gravity

Question 8

the volume occupied by 1 pound of a fluid is known as
a. specific gravity
b. specific volume
c. mass
d. weight

Answer 8

b. specific volume

Question 9

the density of tungsten is 1210 lb/ft3. what would be its specific volume
a. 0.0826 ft3/lb
b. 0.00826 lb/ft3
c. 0.000826 lb/ft3
d. 0.000826 ft3/lb

Answer 9

c. 0.000826 lb/ft3

1/1210

Question 10

the specific volume of red brass is 0.001865 ft3/lb. what would be its density
a. 53.61 lb/ft3
b. 56.19 lb/ft3
c. 536.19 lb/ft3
d. 536.19 ft3/lb

Answer 10

c. 536.19 lb/ft3

0.001865/1

Question 11

aluminum has a density of 171 lb/ft3. what would be its specific gravity
a. 2.74
b. 27.4
c. 4.72
d. 47.2

Answer 11

a. 2.74

171/62.4

Question 12

four pounds of a gas occupy 10ft3. what would be its density and specific gravity
a. 0.4 ft3/lb
b. 0.4 lb/ft3
c. 4.0 lb/ft3
d. 4.0 ft3/lb

Answer 12

b. 0.4 lb/ft3

4/10

Question 13

whose law states that the volume of a gas varies inversely with the absolute pressure, as long the temperature remains constant
a. charles
b. boyles
c. newtons
d. daltons

Answer 13

b. boyles

Question 14

at a constant pressure, how does a volume of gas vary with respect to the absolute temperature
a. it will expand when its heated or cooled
b. it will remain constant
c. it will expand when cooled or contract when heated
d. it will expand when heated or contract when cooled

Answer 14

d. it will expand when heated or contract when cooled

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
a. charles
b. boyles
c. newtons
d. daltons

Answer 15

d. daltons

Question 16

what are the two types of energy most frequently used or considered in the industry
a. solar and fossil fuels
b. nuclear and wind
c. nuclear and solar
d. wind and solar

Answer 16

a. solar and fossil fuels

Question 17

the time rate of doing work is called
a. weight
b. distance
c. power
d. force

Answer 17

c. power

Question 18

force x distance is used to determine
a. weight
b. work
c. power
d. volume

Answer 18

b. work

Question 19

if an air-conditioning compressor weighing 300lb had to be lifted 4ft to be mounted on a base, how much work, in ft-lb, must be done
a. 12,000 lb/ft3
b. 1200 ft3/lb
c. 120 foot-pounds
d. 1200 foot-pounds

Answer 19

b. 1200 ft3/lb

300x4

Question 20

how many watts of electrical energy are equal to 1hp
a. 1492
b. 746
c. 74.6
d. 373

Answer 20

b. 746

Question 21

what unit of energy does the power company charge the consumer for
a. kilowatt-hour
b. watt-hour
c. btu/h
d. therm

Answer 21

a. kilowatt-hour

Question 22

if 3000ft3 of air is crossing an evaporator coil and is cooled from 75F to 55F, what would be the volume of air, in ft3, exiting the evaporator coil
a. 288.7 ft3
b. 28.7 ft3
c. 2887.8 ft3
d. 1392.2 ft3

Answer 22

c. 2887.8 ft3

Question 23

a gas is compressed inside a compressors cylinder. when the piston is at its bottom dead center, the gas is initially at 10 psig, 65F, and 10.5 in3. After compression and when the piston is at top dead center, the gas is 180F and occupies 1.5in3. what would be the new pressure of the gas in psig
a. 196
b. 19.6
c. 1.96
d. 1960

Answer 23

a. 196

Question 24

how many btu/h would be produced in a 12kw electric heater
a. 4095 btu/h
b. 40,956 btu/h
c. 400,956 btu/h
d. 495 btu/h

Answer 24

b. 40,956 btu/h

Question 25

how many btu of heat can be produced by 4kwh of electricity
a. 136,520 btu/h
b. 136 btu/h
c. 1365 btu/h
d. 13,652 btu/h

Answer 25

d. 13,652 btu/h

Question 26

why does an object weigh less on the moon than on the earth
a. gravity isnt as strong as on the moon compared to earth

Answer 26

a. gravity isnt as strong as on the moon compared to earth

Question 27

why is information regarding the specific volume of gases important to the designer of air-conditioning, heating and refrigeration equipment
a. when storing gas, need to understand how pressure builds up

Answer 27

a. when storing gas, need to understand how pressure builds up

Question 28

describe horsepower and list 3 quantities needed to determine horsepower
a. rate of doing work, height, weight, time

Answer 28

a. rate of doing work, height, weight, time

Question 29

explain how specific volume and density are related to each other
a. specific volume = 1 / density/density = 1 / specific volume

Answer 29

a. specific volume = 1 / density/density = 1 / specific volume

Question 30

state the law of conservation of energy and explain its importance with regards to accounting for energy
a. energy can be neither created nor destroyed

Answer 30

a. energy can be neither created nor destroyed

Question 31

explain how heat energy flows between a substance at -125F and a substance at -175F
a. substance with high temp will flow to lower temp

Answer 31

a. substance with high temp will flow to lower temp

Question 32

explain how magnetism can be used to help convert electrical energy to mechanical energy
a. magnetic fields turns motors to create energy

Answer 32

a. magnetic fields turns motors to create energy