Heating and Air

Question 1

The volume of a cube if one edge is 18” is?

Answer 1

3.375

Question 2

what is the best safety situation when working on electrical equipment

Answer 2

Lock out everyone

Question 3

what can be caused by warm air drawn through a raceway into a colder area?

Answer 3

condensation

Question 4

how many fans are necessary to cause 4 changes of air per hour in a 180,000 cu ft warehouse, if a fan exhausts 1,000 cu ft per min

Answer 4

12

Question 5

a micro is what fraction of an inch

Answer 5

1/25,400

Question 6

the range of velocity for human comfort in a room is which of the following?

Answer 6

25 fpm to 35fpm

Question 7

how many fans are neccessary to cause three air changes per hour in a 60,000 cu ft warehouse if a fan exhausts 250 cu ft per min

Answer 7

12

Question 8

galvanized should be used on the inside of skylights. what should be used on the outside

Answer 8

copper

Question 9

how mych potential for air infiltration is there across the surface if an 8 foot ceiling measures 20 feet by 22 feet. assume two air changes per hour?

Answer 9

3,520

Question 10

Which saw would be used to cut straight through the length of a pine board?

Answer 10

A rip Saw

Question 11

what would 2 inches be, if the scale for a set of house plans is 1/2 inch equals 1 foot?

Answer 11

4 feet

Question 12

what is a tight, solid closure of a concealed space places to prevent the spread of fire and smoke through the space known as?

Answer 12

a firestop

Question 13

which of the following has priority if there is a question about meeting “code”?

Answer 13

Local codes

Question 14

what should be done if when drilling through a stud wall, the drill motor becomes to hot?

Answer 14

shut off the drill

Question 15

which of the following wires attaches directly to the junction box?

Answer 15

the bare wire

Question 16

what would the volume be for a cylinder 6 feet high and 18 inches in diameter?

Answer 16

127.23

Question 17

if one edge of a cube is 18 inches, what is the surface area of the cube

Answer 17

13.5

Question 18

what is the perimeter of a concrete slab 30 feet by 40 feet?

Answer 18

140 feet

Question 19

what does a rectangle with a circle in the center with a cross

Answer 19

an expansion valve

Question 20

what has the greatest demand for air changes, a restaurant, garage, storage area, warehouse

Answer 20

a restaurant

Question 21

which of the following is one use for diluted muriatic acid

Answer 21

cleaning cement blocks
cleaning concrete
cleaning and repairing metal

Question 22

what should be done with a dirty disposable fiberglass filter

Answer 22

dispose of and replace

Question 23

is carbon monoxide is a toxic gas?

Answer 23

yes

Question 24

what is the depth of a riser stack between 2x4 studs

Answer 24

3 1/4 inches

Question 25

what is the safest and best way to load a 500 lb package 14 feet up?

Answer 25

hire a crane contractor

Question 26

if the scale for a set of house plans is 1/2 inch equals one foot, what does 1/8 inch equal?

Answer 26

3 inches

Question 27

downdrafts in a fireplace are caused by which of the following

Answer 27

deflected air currents or chilled flue gases

Question 28

a ventilating air opening has which size screen

Answer 28

1 sq in for every 1000 Btu/ hour input

Question 29

how many volts does a house with two wire services have?

Answer 29

120

Question 30

many gases, including oxygen, nitrogen, argon, and traces of helium, carbon dioxide and neon are in dry air over 15% of dry air is made up of what

Answer 30

oxygen

Question 31

clean air at sea level is primarily a mixture of oxygen, argon, carbon dioxide, traces of other gases and what else

Answer 31

water vapor

Question 32

what should be done if there is a downdraft in a chimney

Answer 32

extend the chimney

Question 33

which carries the most current(is heavier)

Answer 33

8 AWG

Question 34

what do the solders sliv 45, silvalay 45, easy flo 45 and sil brite 45 have in common?

Answer 34

they melt at less than 1150 degrees F

Question 35

an extended plenum duct system is usually converted to a branch system after how many feet?

Answer 35

24

Question 36

how many CFM's should blow through a collector per square foot of the collector?

Answer 36

2-3 cu ft

Question 37

if two equally priced items are purchased and a 20% discount is received on one item and a 50% discount on the other item, what is the percentage amount of discount on the final bill?

Answer 37

35%

Question 38

what is the decimal equivlent of 5/16

Answer 38

.3125

Question 39

a GFCI of GFI is required by Cal/OSHA on all 120 volt, AC, single phase, 15-20 ampere receptacles on construction sites when the receptacles are used by workers and the receptacles are not part of which type of wiring of the structure?

Answer 39

permanent

Question 40

sal ammoniac is used for which of the following?

Answer 40

cleaning soldering irons

Question 41

how many feet from work areas should portable fire extinguishers be placed?

Answer 41

75

Question 42

a factor that represents the amount of heat that flows through a building component because of a temperature difference is known as which of the following

Answer 42

a conduction factor

Question 43

how may BTU/hr of heat gain is used for appliances and cooking processes for residential cooling applications?

Answer 43

1200