Ref. and Air Cond. Tech Unit 1

Question 1

Temperature can be through of as the level of ____ _________

Answer 1

heat intensity

Question 2

Temperature is defined as

Answer 2

heat content

Question 3

The standard conditions for water to boil at 212 degrees Fahrenheit are

Answer 3

an atmospheric pressure of 14.96psia, or 29.92 in. HG

Question 4

Fahrenheit, Celsius, Ranking, and Kelvin are

Answer 4

temperature scales

Question 5

Under standard conditions, water freezes at ______

Answer 5

0 degrees celsius

Question 6

Molecular motion stops at

Answer 6

-460 degrees fahrenheit

Question 7

One British thermal unit will raise the temperature of 1 pound of water ____________

Answer 7

1 degree fahrenheit

Question 8

In which direction does heat flow?

Answer 8

from a warmer substance to a cold substance

Question 9

Heat transfer from molecule to molecule is known as ________

Answer 9

conduction

Question 10

An increase in sensible heat causes a _______ thermometer reading

Answer 10

higher

Question 11

Latent heat causes a _______ of state

Answer 11

change

Question 12

Heat that is transferred by moving in a medium such as air or water is known as _____

Answer 12

convection

Question 13

Heat that is transferred through space without heating the space and that heats the first object that it strikes is known as

Answer 13

Radiation

Question 14

Specific heat is the amount of heat necessary to raise the temperature of 1lb of which substance 1 degree fahrenheit

Answer 14

water

Question 15

Atmospheric pressure at sea level under standard conditions is ____ inches of Mercury (Hg) or _____ pounds per square inch absolute (psia)

Answer 15

29.92 inches of Mercury (Hg) or 14.96 psia

Question 16

80 degrees fahrenheit is the equivalent of

Answer 16

26.7 degrees celsius

Question 17

22 degrees celsius is the equivalent of

Answer 17

71.6 degrees fahrenheit

Question 18

To change from psig to psia you must:

Answer 18

add 14.96 to psig

Question 19

A barometer is used to measure ________ pressure

Answer 19

atmospheric

Question 20

How much pressure is exerted downward by a 50-pound solid object that has a base area of 10 square inches?

Answer 20

5 psi

Question 21

What is the formula for finding pressure?

Answer 21

pressure = force/area

Question 22

If a 100lb solid object exerts a downward force of 200 psi, what is the area of the object’s base?

Answer 22

Area= force/pressure 200/100= 0.5square inches

Question 23

The three types of heat transfer?

Answer 23

conduction, convection, radiation

Question 24

Sensible heat is described as a change in _______

Answer 24

temperature

Question 25

Latent heat is described as a change in ______

Answer 25

state