WorksheetsHVAC FC 04
Total questions: 70
Worksheet time: 35mins
Name
Class
Date
1.
The ___ is the temperature below which water vapor in the air will start to condensate.
a)
wet bulb point
b)
dry bulb point
c)
dew point
d)
sensible point
2.
Why is it necessary to be cautios when handling contaminanted refrigerant oil?
a)
It may contain PCBs
b)
It may be acid
c)
It is highly Flammable
d)
It is known carcinogen
3.
When pressure testing hydronic systems, the pressure shall be maintained for a MINIMUM of
a)
15 minutes
b)
30 minutes
c)
45 minutes
d)
1 hour
4.
The ____ measures the rate of flow of current.
a)
volt
b)
ampere
c)
power
d)
watt
5.
Which types of gauges are used to check pressures on an absorption system?
a)
steel manifold gauges
b)
brass manifold gauges
c)
copper manifold gauges
d)
aluminum manifold gauges
6.
A crankcase heater installed in a Heat Pump System is being used to _____.
a)
protect the compressor from "freeze-up"
b)
provide supplemental heat
c)
prevent liquid refrigerant build-up in the compressor
d)
produce supplemental vapor
7.
Previous step to connecting a regulator to a fuel-gas cylinder valve is:
a)
to crack the seal with a metal rod
b)
to open the valve quickly until a cracking sound is heard
c)
to tap the regulator with a wrench to loosen any dust or dirt on it
d)
to open the valve slightly and close it immediately
8.
According to the International Mechanical Code, which method is approved to prevent grease from pooling in Type 1 grease duct cleanouts located on the bottom duct?
a)
bridging
b)
curbing
c)
daming
d)
draining
9.
The ___ is a thermal device that opens its contacts when a motor heater coil uses too much current.
a)
relief relay
b)
fuse
c)
thermal relay
d)
control relay
10.
At what head pressure should the regulating valve be set to open with an inlet water temperature of 75 degrees F that is installed on a water-cooled condenser using R-22?
a)
144 psig
b)
152 psig
c)
160 psig
d)
173 psig
11.
Which of the following is NOT NEEDED for a high-efficiency gas furnace?
a)
chimney for removal of exhaust gases
b)
PVC piping for combustion air
c)
individual venting
d)
condensate drain line
12.
To ensure a trouble-free start-up of an air cooled roof unit in the spring, which circuit should be activared first?
a)
low pressure circuit
b)
high pressure circuit
c)
low ambient circuit
d)
crankcase heater circuit
13.
Regarding motors: ONE horsepower equals to ___.
a)
30.0 ohms
b)
27.8 amps
c)
746.0 watts
d)
120.0 volts
14.
Volume dampers or other means of ___ adjustment shall be provided in the branch ducts or at each individual duct register, grille or diffuser.
a)
manifold vent
b)
supply air duct
c)
furnace vent
d)
combustion vent
15.
Insulation applied to the exterior surface of ducts located inside a building, other than dwellings or apartments, shall have a flame spread rating of not more than
a)
25
b)
50
c)
100
d)
200
16.
The thermal conductivity (k) of a material is a measure of
a)
thickness of a material
b)
insulation
c)
solar gain
d)
how quickly heat can travel through it
17.
What is the MINIMUM temperature required to melt MOST brazing fillers?
a)
450 degrees F.
b)
840 degrees F.
c)
1,000 degrees F.
d)
1,800 degrees F.
18.
Which is common type of motor system used on hermetically-sealed compressors?
a)
induction two-phase and polyphase
b)
repulsion-start, induction-run
c)
capacitor-start, induction-run
d)
induction run
19.
Every portion of Type I hood shall have clearance from unprotected combustible construction of not less than
a)
6 inches
b)
12 inches
c)
18 inches
d)
24 inches
20.
Annealed copper tubing has
a)
less rigidity
b)
more rigidity
c)
thicker walls
d)
smaller internal diameter
21.
Where multiple air-handling systems share common supply or return air ducts with a combined design capacity greater than ___ shall be provided with smoke detectors in accordance to IMC.
a)
a shut-down detector is not required
b)
15,000 cfm
c)
2,000 cfm
d)
5,000 cfm
22.
When working with tubing in fuel gas system, what is the maximum distance allowed between supports for horizontal 1/2 inch O.D.?
a)
10 feet.
b)
8 feet.
c)
6 feet.
d)
4 feet.
23.
Which type of oil is suitable for use with R-410A?
a)
mineral
b)
polyolester
c)
alkyl benzene
d)
polyalkylene glycol
24.
How would you handle defects in gas piping or fittings?
a)
be repaired with epoxy
b)
not be repaired
c)
be repaired by brazing
d)
be repaired by welding
25.
Identify, by its color, a cylinder carrying R-22 refrigerant. It should be ____.
a)
white
b)
green
c)
pink
d)
orange
26.
When installing semi-rigid metallic tubing and metallic fittings for a gas furnace, the lengths shall not exceed ___ and shall be located entirely in the same room as the appliance.
a)
3 feet
b)
6 feet
c)
9 feet
d)
12 feet
27.
What should be called a room where fuel-burning appliances are working and its volume is NO MORE than 50 cubic feet per 1,000 Btu/h rating?
a)
Boiler room
b)
Furnace room
c)
Confined space
d)
Mechanical room
28.
What is the maximum percentage refrigerant cylinders should be filled? (Liquid volume)
a)
0.5
b)
0.7
c)
Add Question
29.
The ____ is better described as the section of air distibution system to which one or more ducts are connected.
a)
register
b)
duct system
c)
plenum
d)
grille
30.
On down flow units, a water-level monitoring device shall be installed inside the ____.
a)
auxiliary drain pan
b)
primary drain pan
c)
auxiliary drain line
d)
primary drain line.
31.
In low temperature applications, lubricants should have
a)
low pour points
b)
high wax content
c)
high hydro-carbons
d)
a low viscosity rating
32.
What divides the point between high and low pressure refrigerants?
a)
liquid line
b)
evaporator inlet
c)
condenser outlet
d)
refrigerant control
33.
Heat pump systems operate with AT LEAST ____ metering devices.
a)
3
b)
2
c)
1
34.
Of the following locations, where are air vents best placed, in a hot water heating system using a closed expansion tank?
a)
at the high point of a radiator
b)
on the discharge side of the pump
c)
near the last coil in the system
d)
at the lowest point
35.
A Btu is defined as the amount of heat necessary to raise
a)
the temperature of one pound of water 1 degree F at sea level
b)
the temperature of a product 1 degree F at sea level
c)
the temperature of one cubic foot of air 1 degree F at sea level
d)
one pound of ice at 32 degree F to one pound of water at 32 degrees F
36.
What device prevents slugging in a heat pump system?
a)
A receiver
b)
A suction line heater
c)
A suction line accumulator
d)
A defrost thermostat
37.
Which type of compressor requires a crasnkshaft seal?
a)
a semi-hermetic compressor
b)
a scroll compressor
c)
an open compressor
d)
a hermetic compressor
38.
The minimum working space along the firebox-opening side of a warm-air furnace is ___ inches in depth.
a)
6
b)
12
c)
18
d)
30
39.
Identify the type of protection needed. -Equipment: gas-fired -Clearance wall requirement: 18 inches -Minimum side clearance desired: 6 inches Best protection would be:
a)
24-gauge sheet metal with no ventilated air space
b)
3 1/2-inch masonry wall with no ventilated air space
c)
1/2-inch noncombustible insulation board over 1-inch glass fiber with no air space
d)
1/2-inch noncombustible insulation board with ventilated air space
40.
Specifications indicate that a 3-inch steel gas will have approximately ___ threads to be cut.
a)
12 threads
b)
8 threads
c)
14 threads
d)
10 threads
41.
A contractor walks into a room where three unmarked gas cylinders were stored for more than 3 days. The room temperature has been about 80 degrees F. What he remembers is that one of the cylinders is R-12, the other is R-22, and another is R-500. They all are half-full. How can the contractor differentiate between the R-22 cylinder and the others?
a)
The cylinder that gives a gauge reading of 84 pounds
b)
There is no way to tell if not marked
c)
The cyclinder that gives a gauge reading of 145 pounds
d)
The cylinder that gives a gauge reading of 103 pounds
42.
A worker needs to install a steel gas pipe underground through a foundation wall. He must provide a (an):
a)
insect guard
b)
protective pipe
c)
fire caulking
d)
metal pipe flange
43.
Take into consideration the following information to solve for the MAXIMUM horizontal length vent connector. A single wall connector for a single fuel gas appliance is being used.-Vertical vent length: 20 feet
a)
15 feet
b)
25 feet
c)
10 feet
d)
20 feet
44.
No portion of a venting system shall extend into or pass through any _____.
a)
above ceiling spaces
b)
mechanical draft systems
c)
concealed spaces with positive pressure
d)
circulating air duct or furnace plenums
45.
The units of thermal conductivity are BTU/SQ.FT./degrees F./HR. It is the measure of ___.
a)
how quickly heat can travel through material
b)
thickness of a materials R-rating
c)
the efficiency of the heat conductance
d)
U-value of the insulation
46.
Grease filters shall be installed at an angle of NOT LESS than ___ degrees from the horizontal and shall be equipped with a drip tray beneath the lower edge of the filters.
a)
90 degrees
b)
60 degrees
c)
45 degrees
d)
30 degrees
47.
Ceiling dampers protecting an opening in a fire-rated ceiling shall conform to which of the following standards?
a)
UL 555
b)
UL 555A
c)
UL 555C
d)
UL NFPA 90A
48.
Unvented fuel-burning room heaters are NOT permitted in a group _____ occupancy.
a)
A
b)
F
c)
S
d)
U
49.
Copper tubing, in a hydronic piping system, shall be joined by ___ with filler metals having a melting point of not less than 1,000 F degrees.
a)
Electro fusioning
b)
Brazing
c)
Threading
d)
Soldering
50.
Which refrigerant is NOT composed of CFC's
a)
R-11
b)
R-12
c)
R-22
d)
R-113
51.
Enthalpy is the measure of the heat content of a substance, determined by both the temperature and the pressure of the substance. The correct formula for enthalpy is :
a)
H = Sp.Ht. x delta T
b)
H = m x sp.ht. x delta T
c)
H = m x delta T
d)
H = m x (Sp.Ht. / delta T)
52.
Which of the following could be the result of an insufficient amount of combustion air?
a)
phosgene gas
b)
stoichiometric condition
c)
burner flames with blue tips
d)
burner flames with yellow tips
53.
The installation of smoke dampers comply with recognized standards is ___.
a)
NOT addressed by the IMC
b)
require only in Group A, E and I occupancies
c)
regulated by the IBC but NOT by the IMC
d)
addressed by the IMC when required by the IBC
54.
Carbon monoxide is a colorless, odorless, and poisonous gas that is produced when carbon fuels are
a)
under firing of the gas burners.
b)
fresh air is blown into the vent stack.
c)
incomplete combustion of fuel.
d)
extinguished with an excess of fresh air.
55.
In the heating cycle, a thermostat with a heat anticipator will remain about how many degrees warmer than the conditions?
a)
1
b)
1.5
c)
2.0
d)
2.5
56.
Sheet metal ducts shall be horizontally supported with approved hangers at intervals NOT exceeding ___ feet or by other duct support systems designed in accordance with code.
a)
14 feet
b)
16 feet
c)
12 feet
d)
10 feet (supported in accordance with the manufacturer's instructions.)
57.
Appliances serving different areas of a building other than where they are installed shall be ___. Example: refrigeration condensing untis located outside and their respective evaporators located at different areas inside a building.
a)
units must be permanently marked
b)
unit line sets must not cross
c)
units must be within 20 feet of each other
d)
unit evaporators must be above condensing
58.
Starting relays are used in hermetic compressor motors to drop which of the following out of the circuit?
a)
run capacitor
b)
start windings
c)
start capacitor
d)
run windings
59.
According to the International Mechanical Code, building with permanently installed roof access ladders shall maintain a minimum unobstructed clearance at the base of the landing measuring?
a)
48" x 48"
b)
36" x 36"
c)
30 x 36"
d)
30" x 30"
60.
A thermostat is a device that detects what?
a)
sensible temperature conditions
b)
latent temperature conditions
c)
enthalpy conditions
d)
psychrometric conditions
61.
The installation and use of gas turbine powered equipment and appliances shall meet the requirements of
a)
NFPA31
b)
NFPA37
c)
UL391
d)
UL2162
62.
A motor starter is necessary for single-phase AC motors more than:
a)
1.0 horsepower
b)
1.5 horsepower
c)
3,.0 horsepower
d)
5.0 horsepower
63.
Which of the following is not a factor in heat loads for a structure?
a)
solar radiation through glass
b)
heat transmitted through wall exposed to outside air
c)
heat transmitted through ceilings from the attic
d)
heat produced by the outside walls
64.
Occupants of space will feel a draft if air is moving at velocities more than how many feet per minute
a)
5 to 10
b)
15 to 20
c)
25 to 30
d)
35 to 40
65.
To ensure a trouble free start up of a refrigeration unit, which of the following circuits should be activated first?
a)
low pressure circuit
b)
high pressure circuit
c)
low ambient circuit
d)
crankcase heater circuit
66.
Certain refrigerants cause a flame to turn green when passing over a hot copper strip. What tool uses this effect to detect leaks?
a)
A welding torch
b)
An infra red torch
c)
An ultraviolet torch
d)
A halide torch
67.
To check the air delivery and balancing of an air conditioning system, you would most likely use
a)
a velocimeter
b)
a psychrometer
c)
a continuity tester
d)
an air gauge
68.
According to the International Mechanical Code, when an exhaust fan used in a commercial kitchen, this exhaust system must be designed to install ___.
a)
a hinged and removable motor
b)
a motor with adjustable pulleys
c)
the motor outside the air stream
d)
an insulated motor
69.
On chimney connectors for residential-type appliances which pass through a combustible wall, the concealed metal part that comes in contact with flue gases shall be of material that resists corrosion, softening, or cracking up to ____ degrees F.
a)
1000
b)
1400
c)
1800
d)
2000
70.
Exhaust outlets shall be located NOT LESS than ___ feet horizontally from above the air intake openings into any building. Example: a commercial cooking exhaust outlets and air intakes.
a)
25 feet
b)
20 feet
c)
15 feet
d)
10 feet
100 %
