unit 1 review(book)

Question 1

temperature is defined as
a. heat content
b. the level of heat
c. the british thermal unit
d. the absence of cold

Answer 1

b. the level of heat

Question 2

the standard conditions of water to boil at 212ºF are
a. an atmospheric pressure of 14.696psig
b. an atmospheric pressure of 0psia, or 29.92 in. hg
c. an atmospheric pressure of 0psig, or 29.92 in. hg
d. an atmospheric pressure of 14.696 psia, or 29.92 in. hg

Answer 2

d. an atmospheric pressure of 14.696 psia, or 29.92 in. hg

Question 3

Fahrenheit, Celsius, Rankine, Kelvin are
a. temperature scales
b. pressure scales
c. btu measurements
d. heat transfer methods

Answer 3

a. temperature scales

Question 4

under standard conditions, water freezes at
a. 0ºC
b. 10ºC
c. 20ºC
d. 32ºC

Answer 4

a. 0ºC

Question 5

molecular motion stops at
a. 212ºF
b. -32ºF
c. -460ºF
d. 0ºF

Answer 5

c. -460ºF

Question 6

one british thermal unit will raise the temperature of
a. 1 gallon of water 1ºF
b. 1 pound of water 1ºF
c. 1 pound of water 1ºK
d. 1 gallon of water 1ºC

Answer 6

b. 1 pound of water 1ºF

Question 7

in which direction does heat flow
a. from a cold substance to a cold substance
b. from a cold substance to a warm substance
c. from a warm substance to a warmer substance
d. from a warm substance to a cold substance

Answer 7

d. from a warm substance to a cold substance

Question 8

8. heat transfer from molecule to molecule is known as
   a. radiation
   b. convection
   c. conduction
   d. evaporation

Answer 8

c. conduction

Question 9

an increase in sensible heat causes
a. a higher thermometer reading
b. a lower thermometer reading
c. no change of the thermometer reading
d. ice to melt

Answer 9

a. a higher thermometer reading

Question 10

latent heat causes
a. a higher thermometer reading
b. temperature to rise
c. a change of state
d. temperature to fall

Answer 10

c. a change of state

Question 11

heat that is transferred by moving in a medium such as air or water is known as
a. radiation
b. convection
c. conduction
d. evaporation

Answer 11

b. convection

Question 12

heat that is transferred through space without heating the space and that heats the first solid object that it strikers is known as
a. radiation
b. convection
c. conduction
d. evaporation

Answer 12

a. radiation

Question 13

specific heat is the amount of heat necessary to raise the temperature of 1lb of which substance 1ºF
a. water
b. air
c. refrigerant
d. any substance

Answer 13

d. any substance

Question 14

atmospheric pressure at sea level under standard conditions is ___ inches of mercury(hg) or ___ pounds per square inch absolute(psia)
a. 14.696, 29.92
b. 29.92,14.494
c. 0.92, 0
d. 29.99, 0

Answer 14

b. 29.92, 14.696

Question 15

80ºF is the equivalent of
a. 26.7ºC
b. 35.4ºC
c. 41.2ºC
d. 48.6ºC

Answer 15

a. 26.7ºC

Question 16

22ºC is the equivalent of
a. 26.7ºF
b. 34.5ºF
c. 71.6ºF
d. 81.4ºF

Answer 16

c. 71.6ºF

Question 17

to change from psig to psia, you must
a. add 29.92 to psig
b. add 14.696 to psig
c. subtract 0.925 from psig
d. subtract 3.1416 from psig

Answer 17

b. add 14.696 to psig

Question 18

10 in. hg is equivalent to
a. 10 psia
b. 20 psia
c. 25 psia
d. 30 psia

Answer 18

a. 10 psia

Question 19

2 psia is equivalent to
a. 29 in. hg
b. 28 in. hg
c. 27 in. hg
d. 26 in. hg

Answer 19

d. 26 in. hg

Question 20

125 psig is equivalent to
a. 14.696 psia
b. 135 psia
c. 139.7 psia
d. 147.7 psia

Answer 20

c. 139.7 psia

Question 21

a barometer is used to measure
a. atmospheric pressure
b. gauge pressure
c. absolute pressure
d. stratospheric pressure

Answer 21

a. atmospheric pressure

Question 22

what size heater will be required to heat the water in a swimming pool from 70ºF to 72ºF in 1 hour if the appliance is 100% efficient and the pool holds 20,000 gallons of water
a. 166,000 btu/h
b. 332,000 btu/h
c. 86,000 btu/h
d. 224,000 btu/h

Answer 22

b. 332,000 btu/h

Question 23

what size heater will be required to heat the water in a swimming pool from 70ºF to 80ºF in 5 hours if the appliance is 100% efficient and the pool holds 20,000 gallons of water
a. 166,000 btu/h
b. 830,000 btu/h
c. 332,000 btu/h
d. 1,660,000 btu/h

Answer 23

b. 830,000 btu/h

Question 24

how much pressure is exerted downward by a 50 pound solid object that has a base area of 10 square inches
a. 50 psi
b. 25 psi
c. 10 psi
d. 5 psi

Answer 24

a. 50 psi

Question 25

if a 100lb solid object exerts a downward force of 200 psi, what is the area of the objects base
a. 0.25 square inches
b. 0.50 square inches
c. 2 square inches
d. 4 square inches

Answer 25

b. 0.50 square inches