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WorksheetsHVAC FC 02
Total questions: 70
Worksheet time: 35mins
Name
Class
Date
1.
When may a replacement listed forced air furnace be installed in an existing closet which is less than 12 inches wider than the furnace and with a minimum clear working space not less than 3 inches along sides, back and top of the furnace?
a)
when approved by the authority having jurisdiction
b)
when such width is in compliance with the manufacturer"s specifications
c)
when approved by the owner
d)
when the installing contractor assumes full responsibility
2.
Piping shall be supported at distances not exceeding the spacing specified in the International Mechanical Code. The maximum interval spacing requirement for a 3/4-inch copper-alloy tubing condensate drain line, installed horizontally shall be:
a)
20 feet
b)
15 feet
c)
10 feet
d)
6 feet
3.
Some old large oil-filled capacitors (found in fluorescent lamp ballasts, and other applications) can leak and create a safety hazard. This dielectric fluid contains what type of material?
a)
Class C
b)
Carbon Dioxide
c)
Carbon Monoxide
d)
PCBs
4.
A typical psychrometric chart graphs relative humidity in percent, dry bulb and wet bulb temperatures. The dry bulb temperatures shown at the bottom of the chart range from ___.
a)
0 degrees F to 100 degrees F
b)
10 degrees F to 103 degrees F
c)
20 degrees F to 107 degrees F
d)
30 degrees F to 170 degrees F
5.
Constants for heat loads are defined in the text Modern Refrigeration and Air Conditioning for a 4 inch thick concrete slab with no finish as
a)
U=0.45; R=1.34
b)
U=0.55; R=1.44
c)
U=0.65; R=1.54
d)
U=0.75; R=1.64
6.
What is the minimum wall thickness for a 1 1/2 inch nominal carbon steel pipe with threaded couplings used to transport liquid Group A1 refrigerant?
a)
Schedule 20
b)
Schedule 40
c)
Schedule 80
d)
Schedule 120
7.
A confined space in which a natural gas appliance has a clearance of 1 inch on the sides and back, and 6 inches on the front requires to have a MINIMUM of ____ permanent ventilation openings communicating with outside air.
a)
two
b)
four
c)
one
d)
three
8.
If the compressor is exposed to cold temperatures, like an air-cooled roof unit, a good operating practice would be to use a ___ circuit during the off cycle to assist with equipment start-up.
a)
crankcase heater
b)
low pressure
c)
high pressure
d)
pressure pump
9.
As a general rule, how many cfm of fresh air per person should be provided to replace oxygen consumption?
a)
10 cfm
b)
15 cfm
c)
20 cfm
d)
25 cfm
10.
A portable refrigerant container shall not be connected to any refrigerating system longer than
a)
Necessary to charge or discharge the system
b)
12 hours
c)
24 hours
d)
48 hoiurs
11.
An air conditioning system thermostat should be placed ___.
a)
near a door or window
b)
near an air duct
c)
where there is a wide range in temperature
d)
where average temperature conditions exist
12.
According to the International Mechanical Code, mechanical joints in refrigerant piping made of annealed temper copper tube shall NOT exceed outside diameter greater than
a)
3/4 inch
b)
7/8 inch
c)
1 1/8 inch
d)
2 inches
13.
During a procedure of soldering or brazing a tube and joint fitting, all air must be removed from the tubing being brazed. This can be best done by purging the tubing with ___.
a)
Ammonia
b)
Oxygen
c)
Air
d)
Nitrogen
14.
Chimneys for residential type or low-heat appliances shall continue AT LEAST ___ above the highest point where they pass through a roof of a building.
a)
5 feet
b)
4 feet
c)
3 feet
d)
2 feet
15.
Following the refrigerant cycle: After the liquid refrigerant enters the evaporator through the refrigerant control, the liquid refrigerant pressure starts working at ___.
a)
at a lower pressure
b)
at a higher pressure
c)
at a higher temperature
d)
fully converted to gas
16.
Fire dampers shall have fire protection rating specified in the International Mechanical Code. If the type of penetration is a 2-hour firewall then the MINIMUM damper rating equals to:
a)
3 hours
b)
2 hours
c)
1-1/2 hours
d)
1 hour
17.
A technician needs to find out the capacity of a 2 psi, 1 1/4 inch schedule 40 natural gas line with a length of 60 feet, a pressure drop of 1.0 psi, and a gas specific gravity of 0.6 the capacity is equals to ____.
a)
6,983 cfh
b)
5,726 cfh
c)
3,821 cfh
d)
4,660 cfh
18.
To prevent the passing of a large amount of oil throughout the system a special separator must be placed in. The line in which this oil separator must go is the ___.
a)
oil
b)
equalizer
c)
suction
d)
discharge
19.
Choose the type of control used in condensing temperature.
a)
Defrost control
b)
Mullion heater
c)
Crankcase pressure regulator
d)
Fan cycling switch
20.
Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized according to the equipment capacity. What would be the minimum size if the requirement was 65 tons of refrigerant?
a)
1-1/4 inch
b)
1 inch
c)
7/8 inch
d)
3/4 inch
21.
In concealed locations, where gas piping other than black or galvanized steels is installed through holes or notches in a residence, the pipe should be protected by shield plates of AT LEAST ___ inches in thickness.
a)
1/4 inch
b)
1/8 inch
c)
1/16 inch
d)
1/32 inch
22.
Boyle"s law is the relationship between pressure and volume of gas, assuming temperature remains constant, the rule is:
a)
absolute temperature changes
b)
volume of a gas varies inversely with pressure
c)
gas state never changes with pressure
d)
absolute pressure changes
23.
Which type of fire extinguisher should be used on an electrical fire?
a)
Class A
b)
Class B
c)
Class C
d)
Class D
24.
The process of generating current in a conductor by placing the conductor in a changing magnetic field is called?
a)
induction
b)
resistance
c)
conductance
d)
capacitive reactance
25.
Which refrigerant control that will throttle the liquid refrigerant to a constant pressure on the low pressure side while the compressor is running?
a)
CPR valve
b)
EPR valve
c)
AXV valve
d)
TXV valve
26.
When a HVAC technician works on a commercial unit, all of the following, with the exception of which one, are likely causes of excessive noise?
a)
the compressor pumping excess oil.
b)
pulleys that are out of line.
c)
a squeaky bearing in the electricmotor.
d)
low head pressure.
27.
Pascal's law states
a)
pressure applied upon a confined fluid is transmitted in equal directions.
b)
a constant pressure, mass and temperature of a gas are inversely proportional.
c)
the volume and pressure of a gas vary inversely if the temperature remains the same.
d)
vapor pressure created in a container by a mixture of gasses is equal to the sum of individual vapor pressures of the gasses contained in the mixture.
28.
If you have a 150,000 BTU oputput forced air furnace, what will be the minimum unobstructed supply air opening, unless otherwise listed by the manufacturer?
a)
150 square inches
b)
300 square inches
c)
1000 square inches
d)
1500 square inches
29.
Where all combustion air is provided by a mechanical forced air system, what MINIMUM rate of combustion air shall be supplied?
a)
0.25 cfm per 1,000 Btu/hr.
b)
0.35 cfm per 1,000 Btu/hr.
c)
0.45 cfm per 1,000 Btu/hr.
d)
0.55 cfm per 1,000 Btu/hr
30.
Commercial Refrigeration is a process in which work is done to move heat from one location to another. The heat transport is traditionally by mechanical or absorption control of ___.
a)
non-cyclic cooling
b)
low-temperature absorption
c)
vapor-compression
d)
humidity and temperature
31.
Appliances located in private garages and carports shall be installed with a MINIMUM clearance of ____ feet above the floor.
a)
8 feet
b)
6 feet
c)
12 feet
d)
10 feet
32.
Propane gas measured at the gas valve outlet should have a pressure of
a)
3.5 inches wc.
b)
8.0 inches wc.
c)
10.5 inches wc.
d)
13.0 inches wc.
33.
Filters with what MERV rating capture 0.3 to 1.0 microns?
a)
1 through 4
b)
5 through 8
c)
9 through 12
d)
13 through 16
34.
Heat leakage can be computed using the ___ of the structure, and is known as the R value, and is the reciprocal of conductance or the overall heat transfer.
a)
thermal transfer
b)
thermal coeffficient
c)
thermal resistance
d)
thermal gain
35.
An appliance which derives all of its combustion air from the outside atmosphere and discharges all flue gases to the outside atmosphere is defined as a ___.
a)
duct furnace
b)
sealed unit furnace
c)
direct vent appliance
d)
sealed combustion vessel
36.
Circulating air for a heating system shall not be taken from an area, the volume of which is less than
a)
25% of the entire volume served by such system
b)
25% of the volume of the building
c)
10% of the entire volume served by such system
d)
10% of the volume of the building
37.
To ____ the bleed-off from a water tower is used.
a)
decrease the amount needed to be evaporated from the tower
b)
reduce the possibility of freezing of the water
c)
distribute the water more evenly
d)
keep water hardness to a minimum
38.
For nail salons, the requiored exhaust shall include ventilation tables or other systems that capture the contaminants and odors at their source and are capable of exhausting a minimum of how many CFMs per station?
a)
125
b)
100
c)
75
d)
50
39.
According to the International Mechanical Code, the minimal thickness of an auxillary condensate drain pan manufactured from non-metallic materials shall be
a)
0.2500 inch
b)
0.0625 inch
c)
0.0312 inch
d)
0.0156 inch
40.
Dealing with Type I hoods and combustible construction: select the correct MINIMUM separation between the grease duct system and the exhaust equipment.
a)
16 inches
b)
12 inches
c)
20 inches
d)
18 inches
41.
A device that separates the low pressure liquid side of a refrigeration system from the high pressure liquid side is called the
a)
receiver
b)
expansion valve
c)
compressor
d)
condenser
42.
What is the component that releases heat from a mechanical refrigeration system?
a)
condenser
b)
evaporator
c)
compressor
d)
metering device
43.
As a technician you are responsible to select and to handle refrigerants. From the list below, name the type of refrigerant oils you must avoid:
a)
Oils that react chemically with refrigerant
b)
Oils that are dry and moisture-free
c)
Oils that are fluid at low temperature
d)
Oils that are stable at high temperature
44.
A steel piping in a hydronic system needs to be installed. Indicate the MAXIMUM vertical spacing in accordance with MSS.
a)
18 feet
b)
15 feet
c)
12 feet
d)
9 feet
45.
When a portable step ladder is required to reach mechanical equipment for repair or inspection, and an access panel which is secured by screws must be removed to get to the equipment, the equipment would be considered _____.
a)
concealed
b)
accessible
c)
inaccessible
d)
readily accessible
46.
What drives the ammonia in an absorption refrigeration system?
a)
generator
b)
compressor
c)
liquid ammonia
d)
heat from the burner
47.
Compared to an air-to-air pump, geothermal heat pumps can reduce energy consumption by over
a)
0.1
b)
0.2
c)
0.3
d)
0.4
48.
Suspended ventilating ceiling material shall have a flame-spread index on ___.
a)
both sides
b)
the top side only
c)
the bottom side only
d)
either the top or bottom sides
49.
If the pressure of the vapor going into the compressor decreases, what will happen to the system capacity
a)
Compressor output will decrease.
b)
Compressor output will increase
c)
Compressor performance is unaffected.
d)
There is no effect on the system.
50.
When adjusting a thermostatic expansion valve, how much time should be allowed between adjustments?
a)
1 to 3 minutes
b)
4 to 9 minutes
c)
10 to 15 minutes
d)
16 to 20 minutes
51.
Why must liquid and suction line piping be sized large enough?
a)
to prevent oil breakdown
b)
to prevent flooding the evaporator
c)
a suction line as large as the liquid line would cause flash gas
d)
to handle the amount of the liquid or vapor required
52.
Clothes dryer exhaust systems shall be independent of all other systems. An installation exhausting more than ___ must be provided with makeup air by an approved means.
a)
50 CFM
b)
100 CFM
c)
150 CFM
d)
200 CFM
53.
A sediment trap is not incorporated as part of the appliance. Where should this trap be installed?
a)
every 25 feet
b)
at the outlet of the meter
c)
they are not required if the gas supply is clean and dry
d)
as close to the inlet of the equipment as practical
54.
Class 0 and Class 1 flexible air ducts shall be listed labeled to which of the following standards?
a)
UL: 181
b)
UL 181A
c)
UL 181B
d)
UL 555C
55.
What does a frosted suction line indicate?
a)
dirty condenser
b)
evaporator fan not running
c)
restricted liquid line drier
d)
leaking compressor intake valve
56.
When a re-inspection is to determine maintenance compliance requirements of a mechanical system, it shall be performed according to
a)
ASHRAE/ACCA/ANSI Standard 15.
b)
ASHRAE/ACCA/ANSI Standard 170.
c)
ASHRAE/ACCA/ANSI Standard 180.
d)
ASHRAE/ACCA/ANSI Standard 183
57.
What type of spaces labeled OSHA as areas of limited egress that are subject to the accumulation of toxic or flammable contaminants or an oxygen deficient atmosphere?
a)
confined spaces
b)
void spaces
c)
non-accessible spaces
d)
limited spaces
58.
Piping in solid floors shall be laid in channels in the floor and covered in a manner that will allow access to the piping with a minimum of damage to the building. In cases where the pipe emerges from the floor, the conduit shall extend NOT LESS than ___ inches.
a)
2
b)
1
c)
2.5
d)
1.5
59.
For the installation of listed fuel-burning appliances, the required clearance from combustible surfaces should be found ____.
a)
in the mechanical code
b)
on the nameplate of the appliance
c)
on the approved plans and specifications for the building
d)
by using a calculation based on the Btu/h output rating of the appliance
60.
The parts of a refrigeration system under evaporator pressure are referred to as the
a)
high side
b)
low side
c)
liquid side
d)
pressure side
61.
Pressure relief valves of a commercial system, located within the machinery room shall terminate ___ at a location not less than 15 feet above the adjoining grade level.
a)
inside the drain
b)
outside
c)
at the sump pump
d)
near the exhaust system
62.
A good refrigerant oil should maintain sufficient body to
a)
lubricate at high temperature and flow at low temperature
b)
react chemically with the refrigerant
c)
evaporate at high temperature
d)
freeze at low temperature
63.
It is required that combustion air enetering and leaving a furnace to be keeped as clean as possible. Combustion air opening that do not terminate in the attic space should have a ____ installed.
a)
a fine mesh screen
b)
back draft damper
c)
fire damper
d)
volume damper
64.
According to the International Mechanical Code, within how many working business days after emergency equipment or appliance replacements/repairs must a permit application be submitted?
a)
1
b)
7
c)
14
d)
30
65.
Attics containing appliances shall be provided with an access point passageway large enough to allow removal of the largest appliance. This passageway shall not be less than ___ in length from the opening to the appliance.
a)
24 feet
b)
22 feet
c)
20 feet
d)
18 feet
66.
An evaporator pressure regulator (EPR) is used in systems with
a)
chilled water systems
b)
low suction pressure
c)
multiple evaporators
d)
high head pressure
67.
What safety switch on a gas furnance is manually reset and will interrupt the voltage to a gas valve?
a)
high limit
b)
low limit
c)
pressure
d)
rollout
68.
Return air ductwork should be approximately how much larger than the supply duct?
a)
0.1
b)
0.15
c)
0.2
d)
0.25
69.
A worker is soldering copper piping for a hydronic system. This is being done from the plastic-to-metal adapter. The MINIMUM separation between piping and adapter should be ____ inches.
a)
24 inches
b)
18 inches
c)
12 inches
d)
6 inches
70.
Energy that is stored is referred to as?
a)
conductive energy
b)
kinetic energy
c)
latent energy
d)
potential energy
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