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PE 1 Practice Test HVAC

Total questions: 105

Worksheet time: 53mins

Name
Class
Date
1.
What is the maximum operating pressure in an air duct system
a)
.5 in wc
b)
2.0 in wc
c)
6.0 in wc
d)
10 in wc
e)
603.3 IMC
2.
A 2000 sq. ft. Type II dry cleaning system shall be provided with an exhaust no less than:
a)
1500
b)
2000
c)
3000
d)
4000
e)
502.6.1 IMC
3.
Combustion air ducts shall have a min. cross sectional dimension of:
a)
1.5"
b)
2"
c)
2.5"
d)
3"
e)
304.6 IFGC
4.
A bathroom in a dwelling unit must be provided with a minimum intermittent exhaust of:
a)
A. 15 cfm
b)
25 cfm
c)
40 cfm
d)
50 cfm
e)
T403.3.2.3 IMC
5.
A hot water heater boiler with a 5,000,000 BTU/Hr input shall have what minimum clearance from the top of the boiler to the ceiling?
a)
2'
b)
3'
c)
7'
d)
10'
e)
T1004.3.1 IMC
6.
A 150,000 BTU residential furnace is located in a confined space where combustion is drawn from the outdoors through horizontal ducts. The minimum area for each of the 2 openings is:
a)
38 sq. in
b)
75 sq. in
c)
150 sq. in
d)
100 sq. in
e)
304.6.1 Horiz. Use 2k IFGC
7.
A heater installed in a public garage must be installed a minimum distance above the floor.
a)
5'
b)
7'
c)
8'
d)
10'
e)
304.6 IMC
8.
An acceptable method for sealing a grease duct is?
a)
Brazing
b)
Soldering
c)
Both A & D
d)
Welded
e)
506.3.2.5 IMC
9.
The burner on a gas hydronic heating system is controlled by
a)
thermostat
b)
valve solenoid
c)
Pressure gauge
d)
high—limit control
e)
1027 MR&AC
10.
A hydronic pipe system should be cleaned with water and after installation.
a)
Chlorine Bleach
b)
Silica Oxide
c)
Hydronic Sodium
d)
Trisodium Phosphate
e)
1032 MR&AC
11.
outside air exhaust and intake opening shall be located a minimum of feet from lot lines of building on the same lot.
a)
10
b)
15
c)
20
d)
25
e)
401.4(1) IMC
12.
Central HVAC systems shall have air filters installed in which of the following locations?
a)
Supply air duct
b)
Supply air plenum
c)
In an approved & convenient location
d)
Upstream from any exchanger & coil
e)
605.1 IMC
13.
An outdoor air ventilation supply system shall deliver the required rate of supply air within a common corridor of an occupied space at a min. flow rate of _ cfm per sq. ft. of floor area
a)
0.6
b)
0.1
c)
0.006
d)
0.001
e)
403.3.2.2 IMC
14.
A is used to measure relative humidity by comparing wet/dry bulb temperatures.
a)
Ohmmeter
b)
Sling Psychrometer
c)
Rheostat
d)
Humidistat
e)
670 MR&AC
15.
Any appliance in which the products of combustion, at the point of entrance to the flue, under normal operating conditions, have a temperature of 1000 degrees, is classified as a appliance
a)
High heat
b)
Medium heat
c)
Low heat
d)
None of these
e)
202 IMC
16.
The temperature for a fire damper actuating device shall not be less than:
a)
50
b)
160
c)
286
d)
350
e)
607.3.3.1(1) IMC
17.
A vent, penetrating an attic, shall be provided with a sleeve that is installed, at least how far above the top of the ceiling joists & insulation?
a)
2"
b)
8"
c)
10"
d)
12"
e)
802.8 IMC
18.
A boiler shall have an unobstructed passageway of _ around all sides.
a)
12"
b)
18"
c)
30"
d)
36"
e)
1004.3 IMC
19.
A 1 ton refrigeration system has the equivalent of _ Btu's.
a)
12000
b)
15000
c)
16000
d)
18000
e)
(4.7.2) 66 MR&AC
20.
The purpose of a suction accumulator is
a)
То prevent moisture that condenses on refrigerant lines from entering the compressor.
b)
То filter out solid particles from refrigerant that pass through the suction line
c)
То catch & hold liquid refrigerant that has passed through the evaporator coil so it does not enter the compressor.
d)
To absorb any moisture that may have contaminated the refrigerant.
e)
94 MR&AC
21.
What is the color for R-11?
a)
White
b)
Orange
c)
Blue
d)
Green
e)
167 MR&AC
22.
What is the color for R-12?
a)
White
b)
Orange
c)
Blue
d)
Green
e)
167 MR&AC
23.
Horizontal pipes in a hydronic system should
a)
Be sloped toward the boiler
b)
Be sloped away from the boiler
c)
Be level
d)
Have a vertical drop
e)
1026 F39-41 MR&AC
24.
A connector connected to a chimney flue shall be at least _ the lowest portion of the interior of the flue.
a)
6" above
b)
6" below
c)
12" below
d)
12" above
e)
801.12 IMC
25.
A(n)_ prevents slugging in a heat pump.
a)
receiver
b)
Suction line heater
c)
accumulator
d)
Defrost thermostat
e)
1056 MR&AC
26.
In a unit controlled by a thermostat, the differential is the difference between _.
a)
A set point & the temp the switch turns on the burners
b)
The temp at which the switch turns on the burners & the temp it turns them off.
c)
A set point & the temp the switch turns off the burners
d)
A set point and the temp of the anticipator
e)
339 MR&AC
27.
An auxiliary drain pan used in a secondary drain system for an a/c system shall have a minimum depth of
a)
1"
b)
1-1/4"
c)
1-1/2"
d)
2"
e)
307.2.3 IMC
28.
Down-pipe support material must not promote
a)
Galvanic action
b)
Dielectric insulation
c)
Insulation fatigue
d)
Vibration dampening
e)
305.2 IMC
29.
Using the psychrometric chart in Modern Refrigeration, what will the wet bulb be if the dry bulb is 80 degrees, and the humidity is 30%?
a)
30 degrees F
b)
30 degrees c
c)
60 degrees C
d)
60 degrees F
e)
673 MR&AC
30.
A duct with an opening temperature of 150 degrees F shall be insulated to limit the exposed surface temperature to
a)
100 degrees F
b)
110 degrees F
c)
120 degrees F
d)
125 degrees F
e)
604.2 IMC
31.
Commercial appliance exhaust outlets that terminate above the roof shall have the discharge opening located not less than _ inches above the roof surface.
a)
20
b)
40
c)
60
d)
80
e)
506.3.13.1 IMC
32.
The minimum size access opening for equipment installed in an underfloor are is?
a)
22x30
b)
36x20
c)
30x30
d)
36x36
e)
306.4 IMC
33.
An external equalizing line should be installed downstream of the thermostatic expansion valve and connect to the at the valve.
a)
seat
b)
diaphragm
c)
capillary
d)
modulator
e)
479 IMC
34.
Materials used in plenums shall have a flame rating of
a)
25
b)
50
c)
75
d)
100
e)
602.2.1 IMC
35.
Flexible air duct connections may pass through which of the following?
a)
The floor
b)
non—rated walls
c)
The ceiling
d)
None of the above
e)
603.6.2 IMC
36.
Pipe insulation shall be used to protect refrigerant piping when the surface temperature drops below ______…
a)
The dew point
b)
The dry bulb temperature
c)
40 degrees F
d)
The liquid refrigerant temperature
e)
1107.4 MR&AC
37.
_ temperature determines the defrost termination on a heat pump using time initiated temperature.
a)
Ambient
b)
Refrigerant
c)
Outdoor coil
d)
None of the above
e)
F40-32 IFGCC
38.
What combination of material will reduce the clearance of an unlisted residential fired furnace from 18" to 6”?
a)
1” fiberglass between two sheets of sheet metal with ventilated arispace
b)
1/2" insulating board over 1" fiberglass
c)
Galvanized sheet metal spaced 1” off of the combustible assembly
d)
3.5" brick wall spaced 1: off of the combustible wall
e)
T308.2 IMC
39.
A fuel fired warm air heater is installed in a residential garage. There is no protection from vehicle impact. The ignition source of the heater must have a minimum ground clearance of
a)
18” .
b)
24"
c)
6’
d)
8'
e)
304.3 IMC
40.
The maximum vertical spacing of steel pipe is
a)
6"
b)
10’
c)
12'
d)
25'
e)
T305.4 IMC
41.
When may refrigerant be reclaimed and reused in a different owner’s equipment?
a)
When approved by the code official
b)
If recommended by the manufacturer
c)
When it meets the purity requirements of ARI 700
d)
Never
e)
1102.2.2.3 IMC
42.
A high pressure boiler shall have a shutoff valve in
a)
The supply line
b)
The return line
c)
The feed water only
d)
The supply and return lines
e)
1005.1 IMC
43.
Which of the following gauges must be equipped on hot water heating boilers?
a)
Pressure
b)
Vacuum
c)
Pressure relief
d)
Fuel
e)
1010.1 MR&AC
44.
If the air temperature is raised from 55 to 75 degrees F, the amount of moisture the air can hold
a)
Almost doubles
b)
Decreases by 20%
c)
Stays the same
d)
Increased by 20%
e)
664 IMC
45.
A heater is installed in a public garage, with 9' roll up door, must be installed a minimum distance of_above the floor.
a)
5'
b)
7'
c)
8'
d)
10'
e)
304.6 SC
46.

What is the formula for ohms law?

(a)  

47.

Before a regulator to a fuel gas cylinder valve is connected, what should be done to the valve?

(a)  

48.

When a torch is used, what fire prevention method should be used?

(a)  

49.

What is the minimum distance between scaffolding and insulated lines less than 300 volts?

(a)  

50.

In what situation would a horizontal lifeline be used?

(a)  

51.

What is the maximum height of a guardrail?

(a)  

52.

Employees should be given a means of egress at a minimum of every feet when working in a trench at least 4’ deep?

(a)  

53.

How often should atmospheric levels be tested when employees work in a trench greater than 4’ deep?

(a)  

54.

Each employee in an excavation shall be protected from cave-ins by an adequate protective system or sloping when excavations are greater than how many feet deep?

(a)  

55.

What is a safe point of anchorage for vertical lifelines for a personal fall arrest system?

(a)  

56.

What is the required pocket depth for button punch snap lock on a 24-gauge galvanized sheet metal?

(a)  

57.

Which of the following duct joints are not required to be sealed? Helical (spiral) seam,

(a)  

58.

What type of ignition uses a silicon carbide igniter?

(a)  

59.

What is the process of expanding or enlarging a copper tube to receive another copper tubing?

(a)  

60.

What determines defrost termination on a heat pump system using time initiated, temperature terminated defrost cycle.

(a)  

61.

White smoke from an oil burner; what does it indicate?

(a)  

62.

Compound gauge reads 248 psig; actual line temp is 100°F. the unit has R—22 refrigerant. What is the subcooling?

(a)  

63.

What kind of circuit has infinite resistance and no current? Open, closed, shorted, grounded.

(a)  

64.

How many BTUs is required to heat 20 lbs. of water from 45°F to 85°F?

(a)  

65.

What is the method of heat transfer that is characterized by the movement of heat from one place to another by way of fluid?

(a)  

66.

What is the highest temperature at which a substance may be liquifled?

(a)  

67.

The low side of a refrigeration system is characterized by;

(a)  

68.

What prevents slugging in the compressor?

(a)  

69.

The condenser does what to the refrigerant?

(a)  

70.

What increases the capacity of the compressor?

(a)  

71.

What controls an automatic expansion valve?

(a)  

72.

What is the purpose of an automatic expansion valve?

(a)  

73.

The capacity of a TEV varies according to all the following except: Orifice of the refrigerant … liquId line, external equalizer

(a)  

74.

What electrical device converts alternating current to direct current?

(a)  

75.

What is the latent heat load in BTUh of air at 1500 cfm and the absolute humidity difference is 28 grains.

(a)  

76.

Sensible heat is a measure of?

(a)  

77.

What electromagnetic device with non-moveable parts transfers from high voltage into variations of voltage in a secondary circuit? electrical energy

(a)  

78.

What gas may be used to purge a copper line while brazing? Nitrogen, Ammonia, Oxygen, Air.

(a)  

79.

The thermostat calls for heat, the draft inducer turns on, the pressure switch closes, the flame ignites but fails to stay lit. What is the problem?

(a)  

80.

What is the possible cause of a yellow flame?

(a)  

81.

Where is the oil pressure safety cutout located?

(a)  

82.

A relay is sticking. How do you fix it?

(a)  

83.

Liquid refrigerant entering the evaporator is suddenly at?

(a)  

84.

When are duct type smoke detectors required?

(a)  

85.

What is prohibited from being installed within a plenum?

(a)  

86.

When a boiler is installed, what must the installer provide to the owner? inspection, control diagram, warranty.

(a)  

87.

What is the maximum air temperature within non-metallic ducts?

(a)  

88.

What is the maximum smoke-developed rating for hydronic piping insulation?

(a)  

89.

What is the minimum test time for hydronic piping?

(a)  

90.

What is the maximum temperature in which the fire damper actuating device is engaged?

(a)  

91.

Schematic of a commercial kitchen hood with roof-mounted exhaust fan.

(a)  

92.

Chilled water pipes should be protected with a vapor barrier to prevent the formation of what to the piping?

(a)  

93.

What is the exhaust ventilation rate for a 35 sq.ft. public bathroom if it is one water closet and one lavatory?

(a)  

94.

What is the minimum size mesh for combustion air openings for fuel burning appliances?

(a)  

95.

What is the minimum number of openings communicating with outside air required to ventilate a confined space where a gas appliance has a clearance of 1" on both sides and the back and 6" in the front?

(a)  

96.

A gas fired unit heater in a warehouse must have how much clearance from the wall?

(a)  

97.

When installing a recirculation direct-fired industrial air heater, what provisions must be made?

(a)  

98.

Gas vent terminates through roof with 12/2 pitch, not at peak of roof. What is the minimum height from the roof to the lowest discharge opening?

(a)  

99.

What is the minimum test pressure for a gas pipe?

(a)  

100.

What is the minimum pipe that can be used on a 165' piping system designed to carry 900 cfh of gas at 1/" wc?

(a)  

101.

Which of the following shall not be used for joints on metallic gas pipe?

(a)  

102.

What is the appropriate vent required for a Cat. I - 125,000 btu. Appliance with “Туре 8" double wall vent if using a natural draft with a height of 15‘ and a lateral run of 2‘?

(a)  

103.

A fan assisted 125,000 bw appliance is placed into a room with а 65,000 but natural draft water heater. What is the common “8 type“ vent size required if the vent is 23’ high?

(a)  

104.

What is the equivalent length in feet of pipe for two 6” 45° elbows and one 6" gate valve?

(a)  

105.

How far shall the unneeded portion of piping outlets extend through floors?

(a)  

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