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WorksheetsHVAC FC 08
Total questions: 66
Worksheet time: 33mins
Name
Class
Date
1.
When any Group 1 refrigerant, except CO2, is removed from a refrigerating system how shall it be discharged?
a)
to the atmosphere at an approved location
b)
from the high pressure side of the refrigerating system to the low pressure side
c)
into an approved shipping container
d)
into an empty disposable container
2.
A zero energy consuming device could be one of the following:
a)
Pneumatic solenoid
b)
A thermocouple
c)
Mechanical relay
d)
Solid state (electromechanical) controller
3.
Where a closet is designed for the installation of a clothes dryer, an opening having an area of not less than ___ for makeup air shall be provided in the closet enclosure.
a)
40 square inches
b)
65 square inches
c)
80 square inches
d)
100 square inches
4.
The _____ thermostat wire is the one approved to pass through air ducts.
a)
smoke-rated
b)
fire-rated
c)
plenum-rated
d)
shock-rated
5.
The minimum dimension of a horizontal duct that is used to introduce combustion air into a confined space must NOT be less than
a)
1 inch
b)
2 inches
c)
3 inches
d)
5 inches
6.
Give details on how a natural gas piping tracer must be installed. It must:
a)
have the radius of bends not less than 20 times the inside diameter.
b)
have the pipe joints threaded and screwed together
c)
include a minimum 18 AWG insulated copper tracer
d)
be laid on a bed of pea gravel
7.
Enthalpy is the
a)
total heat of a substance.
b)
total latent heat of a substance.
c)
total sensible heat of a substance.
d)
measured temperature difference of two substances.
8.
Make-up air shall be supplied to each room with an exhaust system. How shall the amount of the make-up air compare to the amount of air exhausted?
a)
it shall be doubled
b)
it shall be 1 1/2 times
c)
it shall be equal to it
d)
it shall be 1/2 of it
9.
Increasing the superheat tends to ___ the evaporator.
a)
disable
b)
flood
c)
starve
d)
cool
10.
The best alternative to connect Chlorinated Poly Vinyl Chloride (CPVC) pipe joints in a hydronic heating system is by ___.
a)
heat-fused fittings
b)
solvent cement
c)
brazing
d)
welding
11.
Below which surface temperature of pipe insulation must be used on any refrigerant pipe?
a)
triple point temperature
b)
liquid refrigerant temperature
c)
dew point temperature
d)
dry bulb temperature
12.
Mechanical joints, in a refrigeration system, shall not be used on annealed temper copper tube in sizes larger than ___ OD size.
a)
7/8 inch OD
b)
1 1/8 inches OD
c)
5/8 inch OD
d)
3/4 inch OD
13.
What is the term for a condition where a substance changes from a solid to a gas vapor without becoming a liquid?
a)
evaporation
b)
sublimation
c)
out gassing
d)
condensation
14.
A gas piping system must be equipped with a ___ to gather condensation
a)
a filter
b)
a sediment trap
c)
a drop
d)
an evaporator
15.
What should be done with a sticking relay?
a)
clean reminals
b)
lubricate slide
c)
file points
d)
replace it
16.
Which of the following thermosatic expansion valve sensing bulbs uses a liquid refrigerant that differs from the system's refrigerant?
a)
liquid-charged
b)
gas cross-charged
c)
liquid cross-charged
d)
absorption gas cross-charged
17.
The amount of heat required to raise the temperature of one pound of a substance 1 degree F is called
a)
latent heat
b)
super heat
c)
specific heat
d)
total heat
18.
A hydronic system requires numerous valves to function properly. Additionally, a typical hydronic system includes a variety of _____ valves to ensure that water flows in the proper direction through the system.
a)
flow-control
b)
pressure-reducing
c)
balancing
d)
mixing
19.
The time it takes for heat to travel through a substance heated on one side is called:
a)
heat source
b)
heat load
c)
heat lag
d)
heat loss
20.
According to the International Fuel Gas Code, in concealed locations where other than black pipe is installed through holes or notches in wood studs a protective plate must be used. The minimum thickness of the plate is
a)
24 gauge
b)
20 gauge
c)
16 gauge
d)
14 gauge
21.
A heat pump operates when the temperatures are at or above the balance point, and auxiliary heat is energized at what temperature above the balance point?
a)
3 degrees F
b)
4 degrees F
c)
5 degrees F
d)
6 degrees F
22.
What factors must be directly considered in the determining heat loss for a residential structure?
a)
solar effects and internal loads
b)
difference between indoor and oputdoor temperature
c)
the lowest outside temperature locally registered
d)
gross internal wall area
23.
Refrigeration or air conditioning installation that places condensing unit outside or away from evaporator" fits the definition for ____.
a)
split sytem units
b)
side by side units
c)
over and under units
d)
down discharge units
24.
Ohmmeters are used to check ___, open circuits, and grounds.
a)
current
b)
charge
c)
voltage
d)
resistance
25.
What effect does rising temperature have on a container of saturated vapor and liquid refrigerant?
a)
has no effect
b)
saturated vapor volume decreases
c)
pressure increases
d)
liquid volume decreases
26.
Most tube and fitting connections for refrigeration, require the temperature to melt and flow the alloy above 840 deg. F. This technique is referred to as _____.
a)
Bonding
b)
Welding
c)
Soldering
d)
Brazing
27.
What pressure is used to create the differential to operate a mechanical oil pressure control?
a)
low-pressure side
b)
high-pressure side
c)
oil reservoir outlet
d)
receiver outlet pressure
28.
Semi rigid metallic tubing and metallic fitting of a gas connector for a domestic clothes dryer shall NOT extend MORE THAN ____ and shall be located entirely in the same room as the appliance.
a)
6 feet
b)
3 feet
c)
15 feet
d)
10 feet
29.
When pressure testing with an inert gas, never exceed
a)
350 psig
b)
manufacturer,s recommended test pressure
c)
80% of the pressure-relief valve on regulator
d)
80% of the manufacturer's recommended test pressure
30.
If an arc EXCEEDS more than ___ degrees, metallic gas pipe shall not be bent through the arc.
a)
120
b)
30
c)
60
d)
90
31.
In the ___, the liquid refrigerant is now under much reduced pressure. It will evaporate or boil very rapidly. This, in turn, cools the ___. The compressor creates a low pressure drawing the vapor from the ___. Then it compresses the vapor back into the high side. What is this component called?
a)
condenser
b)
refrigerant receiver
c)
cylinder of refrigerant
d)
evaporator
32.
An evaporative cooler supported on a platform above the ground shall be levated at least ___ inches above the adjoining ground level
a)
3
b)
4
c)
6
d)
12
33.
All refrigerant piping installations that contain more than 6.6 pounds of a refrigerant in systems using positive-displacemant compressors shall have stop valves installed at the ___.
a)
inlet of each receiver
b)
outlet of each receiver
c)
inlet of each compressor
d)
outlet of each compressor
34.
A refrigeration system located inside a building and equipped with a pressure relief device must discharge how many feet above the adjoining grade level?
a)
10
b)
12
c)
15
d)
18
35.
Which of the following is not an acceptable material for the base of a boiler?
a)
steel
b)
concrete
c)
compacted earth
d)
stone
36.
What is the most serious effect of not removing all the nitrogen used for pressure testing on an HCFC system?
a)
high head pressure
b)
high suction pressure
c)
formation of nitric acid
d)
formation of flash gas
37.
A permanent electric outlet and light fixture controlled by a switch is required for which type installation?
a)
all warm air furnace installation
b)
installation in closed closets
c)
installation of warm air furnace in attics
d)
warm air furnace installations not located under the floor
38.
Ducts installed within a single dwelling unit shall be sized in accordance with ACCA Manual ____ or other approved methods.
a)
G
b)
F
c)
E
d)
D
39.
Referring to louvers and grilles and their required size of openings for combustion, ventilation and dilution air: screens shall have a mesh size NOT SMALLER THAN ____ inches.
a)
1/2 inch
b)
3/8 inch
c)
1/8 inch
d)
1/4 inch
40.
The stirling cycle, using a three-stage system, can produce tempertures down to
a)
-110 degrees F
b)
-260 degrees F
c)
-300 degrees F
d)
-450 degrees F
41.
Specifications indicate that a 3-inch steel gas line will have approximately ___ threads to be cut.
a)
12 threads
b)
8 threads
c)
14 threads
d)
10 threads
42.
Pipes of ____ are prohibited for use in a gas piping system.
a)
Aluminum
b)
Cast iron
c)
Steel
d)
CSST
43.
When considering a belt drive motor, where the adjustable motor pulley halves are moved CLOSER together, the fan speed shall
a)
stay the same.
b)
decrease.
c)
increase
d)
double
44.
The heat absorbed from the air in a chiller will increase the water temperature by approximately
a)
8 degrees F
b)
10 degrees F
c)
12 degrees F
d)
15 degrees F
45.
Voltmeters are always connected in ___ with the circuit when measuring for proper voltage.
a)
Parallel
b)
Series
c)
Delta
d)
Crossover
46.
Equipment that require access and appliances that are installed on roofs or elevated structures shall be at a height MORE THAN ____ feet; and such access shall be provided by a permanent approved means of access.
a)
6 feet
b)
16 feet
c)
20 feet
d)
30 inches
47.
Choose the type of fittings NOT ALLOWED when dealing with steel gas piping.
a)
bushings.
b)
flange.
c)
couplings
d)
unions
48.
Ducts and air transfer openings that penetrate fire partitions are approved when they are ____.
a)
protected with an approved fire damper
b)
covered with fireproof wrap
c)
are never approved
d)
sealed with fire rated caulk
49.
According to the International Mechanical Code, which type of refrigeration system may be tested and proved tight after installation with air as the test gas?
a)
R-718
b)
R-717
c)
R-125
d)
R-124
50.
With proper care, nitrogen or carbon dioxide may be used safely when pressure testing for leaks. What safety precaution must be followed when pressure testing for leaks?
a)
use a pressure reducing device that has both a pressure regulator and a pressure relief valve.
b)
pre-test each device prior to installation.
c)
use refrigerant in system to test for leaks.
d)
test for negative pressure at the start of testing.
51.
To test a natural gas piping system for tightness, the test medium shall be air, nitrogen, carbon dioxide or ___.
a)
inert gas
b)
LP gas
c)
water
d)
oxygen
52.
Geothermal heat pumps are considered the most efficient conditioning systems available. These pumps can reduce energy consumption and emissions by over ____ compared to air source heat pumps.
a)
0.15
b)
0.25
c)
0.4
d)
0.7
53.
Liquid line receivers for a commercial system should be selected to be what percentage larger than the total volume of liquid in the system?
a)
0.1
b)
0.12
c)
0.15
d)
0.25
54.
The minimum cross serctional dimension of any combustion air duct shall not be less than how many inches?
a)
1 inch
b)
2 inches
c)
3 inches
d)
4 inches
55.
Which of the following is not included in air conditioning and refrigeration maintenance?
a)
repair work
b)
service work
c)
replacement of part of systems
d)
installation or replacement of complete systems
56.
Name the 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
57.
What would be the calculated resistance of a circuit's load, given that the load draws a total current of 20 amperes, and the circuit source operating voltage is 240 VAC?
a)
3
b)
6
c)
12
d)
24
58.
What type of motor can use a hard start kit to increase torque?
a)
PSC
b)
CSIR (capacitor start induction run)
c)
three phase
d)
shaded pole
59.
The air removed by every mechanical exhaust system shall be discharged into the ___ to prevent any nuisance.
a)
crawl space
b)
attic
c)
outdoors
d)
return duct
60.
Commercial kitchen grease ducts shall be designed for the type of cooking appliance and hood served. If the installation calls for a Type 1 Hood, the grease duct must be a minimum thickness steel gage of ___.
a)
18 gage
b)
16 gage
c)
14 gage
d)
12 gage
61.
Some packaged air conditioners using full hermetic type compressors are fitted with a thermostatic expansion valve with an internal bleed port. What is the purpose of the bleed port?
a)
maintain full flow through distributor
b)
keep evaporator from frosting
c)
increase evaporator pressure during off-cycle
d)
to equalize condenser temperature
62.
A thermostatic expansion valve is oversized for a system. Which of the following results will take place?
a)
the evaporator will have a colder temperature
b)
the fuses are likely to blow
c)
the evaporator will have a warmer temperature
d)
the evaporator will alternately be overfed and starved
63.
The absolute pressure in a gauge pressure of 112.7 psig is _____.
a)
130.1 psia
b)
127.4 psia
c)
112.7 psia
d)
122.7 psia
64.
Commercial air-cooled outdoor units require about ___ of condenser air circulation per horsepower, and are considerably less expensive to operate than indoor units.
a)
400 CFM
b)
700 CFM
c)
1,000 CFM
d)
1,200 CFM
65.
What characteristic establishes the classification of industrial heating equipment for the purpose of determining if it is a low-, medium-, or high-heat appliance?
a)
the fuel it uses
b)
the physical size of the appliance
c)
the pressure at which it operates
d)
the temperature of the combustion gases at the equipment flue outlet
66.
According to the International Fuel Gas Code, ducts for combustion air shall not serve more than one ___.
a)
story
b)
residence
c)
appliance enclosure
d)
room
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