unit 2 quiz

Question 1

one watt of electrical energy is equal to
a. 3.3146 btu
b. 3.1416 btu
c. 3.3416 btu
d. 3.413 btu

Answer 1

d. 3.413 btu

Question 2

the volume of gas varies inversely with the absolute pressure, provided the temperature remains constant. this is called
a. toms law
b. boyles law
c. charles law
d. daltons law

Answer 2

b. boyles law

Question 3

a solid material exerts a pressure or force
a. in all directions
b. outward and downward
c. outward only
d. downward only

Answer 3

d. downward only

Question 4

how many watts of electrical power are equal to 1 horsepower
a. 15000
b. 660
c. 746
d. 33000

Answer 4

c. 746

Question 5

if the temperature remains constant and the volume that a gas occupies increases, the pressure will
a. increase
b. decrease
c. cannot be determined from the information given
d. remain the same

Answer 5

b. decrease

Question 6

a vapor material exerts a pressure or force
a. outward and downward
b. in all directions
c. downward only
d. outward only

Answer 6

b. in all directions

Question 7

at a constant pressure, the volume of a gas varies as to the absolute temperature and at a constant volume the pressure of the gas caries directly with the absolute temperature. this is known as
a. daltons law
b. boyles law
c. toms law
d. charles law

Answer 7

d. charles law

Question 8

the unit used to measure electrical power is the
a. watt
b. volt
c. ampere
d. ohm

Answer 8

a. watt

Question 9

a helicopter is lifting an 800-pound unit at a rate of 200 feet per minute. how many horsepower of work energy is the helicopter using in the process
a. 3.863 hp
b. 4.517 hp
c. 4.848 hp
d. 5.209 hp

Answer 9

c. 4.848 hp

Question 10

a liquid material exerts a pressure or force
a. outward only
b. in all directions
c. downward only
d. outward and downward

Answer 10

d. outward and downward

Question 11

the total pressure of a confined mixture of gases is the sum of the pressures of each of the gases in the mixture. this is known as
a. boyles law
b. daltons law
c. toms law
d. charles law

Answer 11

b. daltons law

Question 12

t/f a law of conservation of energy states that energy is neither created nor destroyed

Answer 12

true

Question 13

t/f as heat is applied to a closed container containing a gas, the pressure inside the container will decrease

Answer 13

false

Question 14

t/f an example of a fossil fuel is hydrogen

Answer 14

false

Question 15

t/f specific volume is the term used to indicate the space a weight of gas will occupy

Answer 15

true

Question 16

t/f heat is a form of energy because of the motion of molecules

Answer 16

true

Question 17

the law that states that “energy is neither created or destroyed, but can be converted from one form to another” is called the

Answer 17

law of conservation of energy

Question 18

one horse power of work energy equals the amount of work done when lifting ___ pounds to the height of ___ foot in ___ minute

Answer 18

33,000lbs > 1ft > 1min

Question 19

most of the energy we use comes from something we already have on earth. the only new energy we get comes from the ___

Answer 19

sun

Question 20

a material that occupies space and has mass is called ___

Answer 20

matter

Question 21

the unit of measurement of electrical power is the ___

Answer 21

watt/kw

Question 22

the three basic states of matter are ___, ___, and ___

Answer 22

solid, liquid, gas

Question 23

___ ft/lb of work is accomplished when an 800-lb. condensing unit is lifted to the top of a 40ft building

Answer 23

32,000 ft/lb

Question 24

define power

Answer 24

force x distance

Question 25

define a molecule

Answer 25

molecule is a matter that occupies space and has mass

Question 26

one pound of ice at 20F exerts its force downward. after absorbing 200btus, what directions will the force be exerted after absorbing 2000 btus

Answer 26

outward then all directions

Question 27

define an atom

Answer 27

atom is a molecule

Question 28

define density

Answer 28

how compact something is

Question 29

define specific gravity

Answer 29

density of substance / density of water

Question 30

define specific volume

Answer 30

1 / density

Question 31

___ is a method of converting electron flow to usable energy

Answer 31

magnetism

Question 32

how many btu of heat can be produced by 18kw electric heater

Answer 32

61/434 btu

Question 33

on a 410a manifold gauge what is the max working pressure of the high side gauge

Answer 33

800

Question 34

the density of water is ___
the specific gravity of water is ___

Answer 34

62.4 lb/ft3
1

Question 35

air at standard atmospheric conditions has a density of 0.0075 lbs/ft3 what would the specific volume be

Answer 35

13.33 lbs/ft3

Question 36

heat energy will travel from a ___ temperature substance to a ___ temperature substance

Answer 36

warm > cold

Question 37

t/f in 1990 president george bush signed the clean oil act amendment that initiated production freezes and bands on certain popcorn oils

Answer 37

false

Question 38

if we have an oil or gas furnace that has an output capacity of 175,000btu/hr and want to replace it with electric heater how many kw electric heat system would be required

Answer 38

51.27kw

Question 39

how many classmates are in your class

Answer 39

23

Question 40

too much humidity in a home during the summer causes ___,___,___, this is why it is important to have a properly sized ___

Answer 40

mold > mildew> fungi > ac unit