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WorksheetsHVAC FC 05
Total questions: 70
Worksheet time: 35mins
Name
Class
Date
1.
What is required for a rated safety relief valve installed on a hot water heating or supply boiler?
a)
it must be the designated minimum size and pressure rating
b)
it must be the designated maximum size and pressure rating
c)
it must relieve pressure at no more than 125% of the maximum allowable operating pressure of the boiler
d)
it must be set to relieve at or within 6% of the maximum allowable working pressure of the boiler
2.
What is the maximum percentage of refrigerant cylinders should be filled/ (liquid volume)
a)
50 percent
b)
60 percent
c)
70 percent
d)
80 percent
3.
Materials within plenums shall be noncombustible or shall have a smoke-developed index of NOT MORE THAN ____ when tested in accordance with ASTME E 84.
a)
450
b)
250
c)
50
d)
25
4.
Decide which of the following statements are TRUE about the installation of vertical lifelines, independent support lines, and suspension ropes:
a)
must be attached to the same point on the scaffold
b)
must be attached independently of the scaffold
c)
must be attached to each other
d)
must use the same point of anchorage
5.
What determines air pressure at the Earth's surface?
a)
altitude
b)
humidity in the atmosphere
c)
weight of the air above the earth
d)
current weather conditions
6.
Items such as ___ use Desiccants to get the job done.
a)
gauge glasses if combined with moisture indicators
b)
strainers
c)
driers
d)
moisture indicators
7.
Appliances located in public garages, for example a suspended duct heater, shall be installed a MINIMUM of _____ feet above the floor.
a)
10
b)
6
c)
7
d)
8
8.
The heat absorbing ability of a refrigeration unit is 2,880,000 Btus per 24 hours. What is its to rating?
a)
5.0 tons
b)
7.5 tons
c)
10.0 tons
d)
15.0 tons
9.
An outside-air inlet serving a nonresidential portion of a building may be covered with screen the size of the openings in this screen mesh must be greater than what size?
a)
1/8 inch
b)
1/4 inch
c)
1/2 inch
d)
3/4 inch
10.
What is the dry bulb temperature line range on a normal, medium range psychrometric chart?
a)
20 degrees F to 107 degrees F
b)
0 degrees F to 212 degrees F
c)
0 degrees C to 100 degrees C
d)
20 degrees C to 107 degrees C
11.
If an under floor space is supplied with warm air from a furnace, what type of controller system is generally used?
a)
An adjustable control set at 165 deg F.
b)
Thermostatic blower control set to 140 deg. F
c)
A circulating fan control which starts at no higher than 150 deg. F
d)
A furnace cut off switch with an automatic controller that is set to 120 Deg. F
12.
When a central furnace is installed under a floor and supported from above, what is the minimum clearance above finished grade required?
a)
3 inches
b)
4 inches
c)
5 inches
d)
6 inches
13.
The refrigerant of a mechanical refrigerating system is conveyed by soft annealed copper tubing. When can the tubing be enclosed without visual inspection by the building official?
a)
when no fittings or joints are concealed
b)
when all joints are brazed
c)
when pressures do not exceed 300 psi.
d)
when all joints have mechanical fittings
14.
One of the most popular types of the hermetically sealed compressors are the reciprocating compressors, these systems typically use what type of motor?
a)
Three phase asynchronous
b)
Permanent split capacitor
c)
Capacitor start and run
d)
Induction run
15.
In minor repairs of mechanical equipment, defective parts shall be replaced or repaired such that they will ___.
a)
allow the equipment to be resold
b)
preserve the original approval or the listing
c)
preserve the efficiency of the equipment
d)
allow the equipment to operate like new
16.
Which type of ice maker is used to make ice flakes?
a)
Auger
b)
Electrical grid
c)
Evaporative scraper
d)
Flat plate
17.
A ____ fits perfectly this definition: "Electrical control that is operated by changing humidity."
a)
transformer
b)
dehumidifier
c)
humidistat
d)
humidifier
18.
Which refrigerant control device CANNOT be adjusted?
a)
Electric solenoid valve
b)
Capillary tube
c)
Automatic expansion valve
d)
Thermostatic expansion valve
19.
The amount of refrigerant in the system must be carefully calibrated when charging and using which metering device?
a)
high side float
b)
low side float
c)
capillary tube
d)
expansion valve
20.
Explain how to prepare duct linings where an electric duct heater is at. These linings need to be:
a)
doubled
b)
uninterrupted at the heater
c)
cut back 6 inches upstream and downstream
d)
fireproofed
21.
A cooling system with a sewer vent concluding at 18 inches above the intake shall have MINIMUM horizontal distance between the sewer vent and fresh air intake of ____ feet.
a)
no minimum distance is required
b)
10 feet
c)
5 feet
d)
2 feet
22.
Electrical device for converting ac to dc is better known as a:
a)
transducer
b)
rectifier
c)
transistor
d)
inverter
23.
The ___ control automatically shuts off the gas if the water temperature or pressure get too high in a gas-fired hydronic system.
a)
thermostat
b)
pressure relief valve
c)
primary stack control
d)
high limit
24.
The difference between the pressure in a piping system and atmospheric pressure is measured in
a)
pounds per square inch gauge
b)
absolute pressure
c)
total pressure
d)
inches of vacuum
25.
In many condensing unit applications, it is necessary to heat the compressor to evaporate liquid refrigerant trapped in the oil. Most large compressors for commercial applications are manufactured and equipped to handle this situation using a ___.
a)
crankcase heater
b)
low temperature heating circuit
c)
high temperature cooling circuit
d)
off cycle oil pressure reducer
26.
Cooper tubing used in air conditioning and refrigeration systems and is available in soft and hard types, as well as different wall thicknesses. In commercial refrigeration, most of the ACR tubing currently being used is of what type?
a)
Type C
b)
Type S
c)
Type K
d)
Type L
27.
Tags were placed to identify equipment on which some work is being done. Also, this equipment must not be operated until further notice. According to OSHA, the tags shall be attached to:
a)
all points where the equipment can be energized
b)
the place where the equipment is being worked on
c)
the point where the main source of energy is connected
d)
all places where the equipment touches the ground
28.
A technician is working in an air conditioning system. Ductwork is being installed in a non-conditioned attic. The tech must do what to these ducts?
a)
installed level
b)
insulated
c)
weatherproofed
d)
sloped to the furnace
29.
The ____ is a metal sleeve with fabric connection used to reduce noise in an exhaust system.
a)
Vibration isolator
b)
Dampening collar
c)
Muffler
d)
Transition fitting
30.
A contractor is covering up a gas piping in a wall.This pipe is NOT black or galvanized steel. It is installed from edge of a stud and is not using a shield plate. What must be the appropiate MINIMUM distance between the stud and the pipe?
a)
1-1/2 inches
b)
2 inches
c)
1/2 inch
d)
1 inch
31.
Identify the location for pressure connections in an oil pressure safety cutout. They are at the:
a)
liquid line pressure/suction
b)
high side pressure/oil pump
c)
hot gas pressure/suction
d)
low side pressure/oil pump
32.
If required, where are refrigerant relief valves usually located?
a)
evaporator
b)
compressor crankcase
c)
condenser coil
d)
liquid receiver
33.
You were asked to supervise the setup of air ducts for a gas-fired appliance with an input of 240,000 BTU/h. Ducts have to release combustion air through an opening to the outdoors. As you were checking the finished work, you noticed ducts were not up to code because they were size:
a)
30" X 2"
b)
15" X 4"
c)
12" X 5"
d)
10 X 6"
34.
All of the following statements are true regarding causes of high noise while servicing a commercial unit, WITH THE EXCEPTION OF:
a)
a squeaky bearing in the electric motor
b)
low head pressure
c)
pulleys that are out of line
d)
the compressor pumping excess oil
35.
What establishes the low side pressure in the evaporator?
a)
the refrigerant control
b)
length of refrieration tubing
c)
size of refrigeration tubing
d)
the compressor
36.
According to the International Fuel Gas Code, when bonding corrugated stainless steel gas pipe to the electrical service grounding electrode system, the AWG copper wire size shall NOT be less than
a)
12
b)
10
c)
8
d)
6
37.
While servicing a furnace, the technician identified a yellow-tipped flame while burning fuel gasses. This is a possible cause of:
a)
insufficient primary air
b)
sufficient primary air
c)
insufficient secondary air
d)
sufficient secondary air
38.
As a technician you already know equalizers compensate for any pressure drop through the evaporator while the compressor is running. If the pressure drops between the inlet and outlet MORE THAN ___psi, an equalizer line should be used.
a)
3.0 psi
b)
2.5 psi
c)
6.0 psi
d)
4.0 psi
39.
The measurement of efficiency for furnaces is the ___.
a)
heat transfer coefficient rating
b)
heat fuel performance factor
c)
seasonal energy efficiency rating
d)
annual fuel utilization efficiency
40.
According to the International Mechanical Code, the access opening to a furnace unit located in an attic space must be at least as large as the largest piece of the furnace, but the minimum dimensions of such access opening shall not be less than
a)
24" by 24"
b)
22' by 36"
c)
24" by 30"
d)
20" by 30"
41.
Gas pipe made of ___ is the one approved to use in underground applications only.
a)
aluminum
b)
steel
c)
copper
d)
plastic
42.
The best description for a ___ is: a continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment.
a)
plenum
b)
duct system
c)
furnace room
d)
common corridor
43.
Condensate shall not discharge into a street, alley or other areas so as to cause a nuisance. However, shall be conveyed from the drain pan outlet to an approved place of disposal such as:
a)
sidewalk or alleyway
b)
driveway or vacant lot
c)
roof drain systems that discharges into open space
d)
sanitary sewer drain, storm sewer drain or approved french drain
44.
Fuel gas pipe shall be marked at each end of each length indicating code compliance. However, what type of pipe shall NOT be used in exterior locations or underground?
a)
aluminum pipe
b)
steel pipe
c)
copper pipe
d)
wrought iron pipe
45.
The "R" value of material is its
a)
thermal resistance
b)
heat transfer coefficient
c)
heat transfer rate
d)
internal film coefficient
46.
An HVAC technician must NOT use ___ to pressurize appliances (in a refrigeration system) to check for leaks, because when mixed with compressor oil, an explosion may occur.
a)
nitrogen
b)
carbon dioxide
c)
oxygen
d)
carbon monoxide
47.
The 2003 International Mechanical Code states that for a heating system in an office building which provides air in excess of ___ CFM, automatic shutoff shall be provided for by smoke detectors.
a)
1000
b)
2000
c)
5000
d)
10000
48.
The minimum size for an access openings for fire dampers shall be___.
a)
18" X 24"
b)
the same as the dimension of the duct
c)
one half the diagonal of the duct
d)
adequate to permit maintenance and resetting of the damper
49.
During inspection duct linings at the area of operation of a fire damper were not approved. To pass next inspection, the duct linings must be:
a)
interrupted
b)
cut back 4 inches
c)
fireproofed
d)
doubled
50.
Test on refrigerant piping shall be performed with an inert dried gas, such as ____.
a)
hydrogen
b)
compressed air
c)
nitrogen
d)
oxygen
51.
FRom the expansion valve, an external equalizer line usually runs to the
a)
condenser
b)
compressor
c)
inlet of the evaporator
d)
outlet of the evaporator
52.
A 10-inch diameter duct used to pass on abrasive materials should have a MINIMUM nominal thickness of:
a)
14 gage
b)
16 gage
c)
18 gage
d)
20 gage
53.
Where infrared heaters are installed, the minimum CFM of ventilation air per 1,000 Btu/h input shall be
a)
2
b)
4
c)
6
d)
8
54.
According to the International Mechanical Code, for clothes dryers, makeup air shall be provided for all installations exhausting more than
a)
100 CFM
b)
200 CFM
c)
300 CFM
d)
400 CFM
55.
What device can limit a compressor current draw?
a)
crankcase pressure regulator
b)
flow check piston
c)
rollout switch
d)
thermostat
56.
The diameter of a belt riding on a pulley is measured at the
a)
inside of a belt.
b)
center of the belt.
c)
outside of the belt.
d)
outside of the pulley.
57.
Where may condensate drain or be collected and discharged?
a)
driveway or alleyway
b)
sanitary sewer drain, storm sewer drain or approved French drain
c)
roof drain, concrete pad, or other location if the unit is larger than three tons
d)
sidewalk
58.
In a medium temperature application, the major resistance to heat transfer in the evaporator is the film of refrigerant oil. How may this be reduced?
a)
increasing the velocity of refrigerant flow
b)
adjusting the super-heat
c)
raising the condensing pressure
d)
lowering the condensing pressure
59.
Which device is NOT considered a pressure relief valve?
a)
valve disk
b)
rupture disk
c)
fusible plug
d)
spring loaded valve
60.
The minimum unobstructed total area of the return-air ducts from a 300,000 Btu/h (output rating) blower-type furnace is ___ square inches.
a)
60
b)
150
c)
300
d)
600
61.
Which of the following options is FALSE about uncoated metallic ducts installed under concrete slabs:
a)
sloped to an accessible plenum for drainage
b)
accessible for cleaning
c)
encased on all sides with a minimum of 2 inches of concrete
d)
properly sealed and secured prior to encasement
62.
Ducts shall NOT be constructed of ___.
a)
fiberglass
b)
sheet metal
c)
PVC
d)
asbestos
63.
Where equipment replacements and repairs are required to be performed in an emergency situation, the permit application shall be submitted within ___ to the department of inspection.
a)
5 working days
b)
1 working day
c)
next working day
d)
same working day
64.
If a vessel of AT LEAST ____ deep with an open top is labeled a confined space.
a)
8 feet
b)
6 feet
c)
4 feet
d)
2 feet
65.
Welded fittings used in steam piping systems must be
a)
solvent welded PVC
b)
schedule 40 galvanized steel
c)
black steel
d)
cast iron
66.
A ___ should not be set up inside a plenum
a)
pneumatic tubing
b)
steel water piping
c)
fuel fired appliance
d)
wiring
67.
Every pressure relief valve on a mechanical refrigerating system shall be connected to the refrigerant discharge pipe of the compressor it serves. Where shall these releif valves be located?
a)
between the compressor and condenser
b)
between the condenser and liquid storage tank
c)
between the liquid storage tank and liquid shutoff valve
d)
between the compressor and the first shutoff valve at the condenser
68.
A direct vented appliance rated at 50,000 Btu/h shall be located so that a minimum clearance of ____ is maintained between vent terminals and from any openings through which combustion products enter the building.
a)
9 inches
b)
6 inches
c)
3 inches
d)
2 inches
69.
Which types of circulator pumps are typically used in hydronic systems?
a)
Positive displacement pumps
b)
Centrifugal pumps
c)
Rotary vane pumps
d)
Piston pumps
70.
When sizing an air conditioning or refrigeration system, which component is based on the total heat of rejection?
a)
compressor
b)
condenser
c)
evaporator
d)
metering device
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