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WorksheetsHVAC FC 06
Total questions: 70
Worksheet time: 35mins
Name
Class
Date
1.
Which instrument measures pressure above or below atmospheric pressure?
a)
compound gauge
b)
pressure gauge
c)
barometer
d)
psychrometer
2.
Assume that a gas-fired appliance is located in a garage. Burners of such appliance must be at a distance above the garage floor AT LEAST ____.
a)
There is no minimum clearance
b)
18 inches
c)
12 inches
d)
6 inches
3.
According to Ohm's Law, the correct units for electrical current are
a)
Ohms.
b)
Watts.
c)
Volts.
d)
Amperes.
4.
Where should the air conditioning system thermostat be located?
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
5.
How can the head pressure in an air-cooled condenser be determined?
a)
by taking the operational pressure
b)
by subtracting the condenser temperature from the room temperature
c)
by subtracting 25 degrees F (13 degrees C) from the present condenser temperature
d)
by adding 30 degrees to 35 degrees F (17 degrees C to 19 degrees C) to the desired condenser temperature
6.
What pressure is R-134a at 40 degrees F?
a)
30 psig
b)
35 psig
c)
40 psig
d)
45 psig
7.
Locking refrigerant service access ports are REQUIRED on
a)
class B refrigerants
b)
class A3 refrigerants
c)
all access ports
d)
only ports located outdoors
8.
Industrial air heaters: the installation shall include adequate provision to permit direct-fired industrial air heater to operate at rated capacity by taking into account the structure's designed infiltration rate, providing properly designed ____ or an interlocked power exhaust system.
a)
relief air openings
b)
make-up water
c)
refrigerant piping
d)
ductwork
9.
Heat of fusion of water, is the heat released from a substance to change irt from a liquid state to a solid state. The heat of fusion of ice is ___ Btu per pound.
a)
144
b)
109
c)
42
d)
31
10.
The operating temperature for grease hood fire dampers shall NOT be more than ___ where located in a smoke control system.
a)
310 degrees F
b)
212 degrees F
c)
350 degrees F
d)
286 degrees F
11.
Components of the condensate disposal system shall be cast iron, galvanized steel, copper, etc. All components shall be selected for the pressure and temperature rating of the installation, and the joints and connections shall be made in accordance with the applicable provisions of Chapter 7 of the ____ relative to the material type.
a)
IFGC
b)
UMC
c)
IMC
d)
IPC
12.
Attics containing appliances shall be provided with an opening and unobstructed passageway. The passageway shall NOT be less than 30 inches high and ___ inches wide.
a)
48 inches
b)
36 inches
c)
30 inches
d)
22 inches
13.
Which instrument is used to measure the pressure drop across an air filter?
a)
anemometer
b)
hygrometer
c)
manometer
d)
psychrometer
14.
Designing and assembling scaffolding systems is a very important safety task that should be done by authorized personnel. From the list below, select the person who should be responsible of executing this task:
a)
a competent person
b)
the employer
c)
an authorized employee
d)
a professional engineer
15.
Where is hot refrigerant vapor pumped directly into, in the hot gas defrost method?
a)
compressor
b)
evaporator tubing
c)
condenser
d)
air handler
16.
Select the statement that better describes how a stud wall cavity is proposed to be used for a supply air plenum for an area of a structure:
a)
shall comply with the floor penetration requirements of the International Fire Code
b)
not allowed by code
c)
may be part of a required fire-resistance
d)
can convey air from multiple floors
17.
By referring to the "Piping Support Spacing" table, a copper tubing or 3/4 inch diameter shows a MAXIMUM horizontal spacing of ___ feet.
a)
10
b)
12
c)
6
d)
8
18.
The return air from a dwelling unit shall not be discharged through the cooling system into
a)
a mechanical room
b)
a furnace room
c)
a cooridor which opens to the exterior
d)
another dwelling unit
19.
What system problem can be avoided by correctly sizing the low-side filter drier at the compressor end of the suction line?
a)
Flood back to the compressor
b)
Expansion valve hunt
c)
Resistance to flow of the vaporized refrigerant
d)
Compressor over heating
20.
According to the International Fire Code, duct smoke detectors in heating and AC systems must be connected to what?
a)
fire department
b)
electrical supply to the building
c)
gas supply to the building
d)
the building fire alarm system
21.
According to ASHRAE 34, a commercial refrigeration system with an occupied space of 4,000 cubic feet may have up to how many pounds of R134A refrigerant?
a)
48
b)
52
c)
60
d)
90
22.
What is a by-product of incomplete combustion due to an insufficient amount of combustion air/
a)
phosgene gas
b)
benzyl bromide
c)
carbon dioxide
d)
carbon monoxide
23.
Polybutylene pipe and tubing in hydronic systems must be installed in continuous lengths or must be joined by _____ in accordance to code.
a)
solvent cement
b)
compression fittings
c)
mechanically
d)
heat fusion
24.
The operation of the thermostatic expansion valve is controlled by the temperature of the thermal expansion valve and the pressure in the evaporator. Therefore, when does the needle valve in the refrigeration system normally open?
a)
When the evaporator pressure is low and the temperature is above normal.
b)
Low evaporator pressure, and temperature is above normal.
c)
Compressor pressure is reduced in evaporator.
d)
Evaporator liquid level is excessively low.
25.
What is respiration?
a)
sweating on cooler walls
b)
air leaks at cooler doors
c)
heat evolved from life process of fruits and vegatables
d)
formation of moisture due to evaporator effect
26.
Area or zone in a climate or psychrometric chart described as: "the range of generally comfortable temperature, humidity, and sometimes air movement" is known as the ___.
a)
safety zone
b)
dalton zone
c)
leo zone
d)
comfort zone
27.
Liquid receivers for a commercial system should be selected to be what percent larger than the total volume of liquid in the system?
a)
0.1
b)
0.12
c)
0.15
d)
0.25
28.
Which occupancy classification is BEST used to describe that portion of premises where people transact business, receive personal service, or purchase food and other goods?
a)
mixed occupancy
b)
commercial occupancy
c)
public assembly accupancy
d)
large mercantile occupancy
29.
A technician is working on an exterior wall doing some notching. This wall is of nominal 2" x 6" wood stud. This means this wall must be notched every ___.
a)
2 inches
b)
3/4 inch
c)
1 inch
d)
1-3/8 inch
30.
Exposed optical-fiber raceways installed in concealed spaces above suspended ceilings used as air plenums shall ___.
a)
NOT be permitted by the 2003 International Mechanical Code
b)
have a maximum flame-spread index of 25
c)
exhibit a flame travel/spread of five feet or less
d)
have a maximum smoke-developed rating of 50
31.
Drain pipe materials must be sizes according to the International Mechanical Code. What would be the required size of a condensate pipe that has a cooling capacity of 55 tons of refrigerant?
a)
1 1/16 inch
b)
1 1/8 inch
c)
1 1/4 inch
d)
1 3/4 inch
32.
Venting systems shall NOT extend into or pass through any fabricated ___ or furnace plenum.
a)
crawl space
b)
attic space
c)
enclosed chase
d)
air duct
33.
The burner on a gas-fired hydronic heating system is controlled by the:
a)
Pressure gauge
b)
Thermometer
c)
High-limit control
d)
Temperature sensor
34.
Concerning reversing valves, select the element that works as the temperature-terminated defrost control and on a heat pump.
a)
Outdoor coil
b)
Ambient
c)
Refrigerant
d)
Suction line
35.
Duct systems serving a Type I hood/grease hood shall slope not less than how much per lineal foot toward the hood?
a)
1 inch
b)
1/4 inch
c)
3/4 inch
d)
1/2 inch
36.
How can you explain the definition for Differential Adjustment control?
a)
It is the set point and the temperature at which the switch turns the system off
b)
It is the set point and the temperature at which the heat anticipator begins to produce heat
c)
It is the set point and the temperature at which the switch turns the system on
d)
Temperature at which the switch turns the system on and the temperature at which it turns it off
37.
A technician is fixing a leak on a silver soldered joint in a refrigerant pipe. He must do what?
a)
light oil the ends of the tubing inside and out.
b)
debur the ends of the tubing.
c)
apply flux to the outside of the tubing.
d)
clean the inside of the fittings with emery cloth.
38.
Standard installation practice calls for an HVACR appliance located on a roof top to be securely fastened on a:
a)
pressure treated lumber frame
b)
metal supporting structure
c)
concrete slab and anchors
d)
level platform
39.
Slowing the velocity of water through an evaporator will have what effect on the evaporator?
a)
increase
b)
decrease
c)
no change
d)
slightly improve
40.
MAXIMUM screen opening size approved for fresh air ventilation caps in commercial applications is ___ inches.
a)
0.75"
b)
0.25"
c)
1.00"
d)
0.50"
41.
Where all combustion air is provided by a mechanical air supply system, the combustion air shall be supplied from the outdoors at a minimum rate of ___ of the total input rating of all appliances located within the space.
a)
0.15 cubic feet per minute per 1,000 Btu/h
b)
0.25 cubic feet per minute per 1,000 Btu/h
c)
0.35 cubic feet per minute per 1,000 Btu/h
d)
0.45 cubic feet per minute per 1,000 Btu/h
42.
Where gypsum products are exposed in ducts or plenums, the air temperature shall NOT exceed ___ degrees F.
a)
100
b)
125
c)
150
d)
175
43.
Exhaust duct size for a domestic clothes dryer shall be how many inches in diameter?
a)
3
b)
4
c)
5
d)
6
44.
According to the International Mechanical Code, all refrigerating piping, fittings, suction line, etc., during normal operation, will reach a surface temperature below the dew point of the surrounding air, and are located in spaces or areas where it could cause a safety hazard. Therefore insulation is used to ____.
a)
reduce the amount of vibration and noise of the system
b)
decrease the superheat of the system
c)
increase the superheat of the system
d)
prevent condensation in these spaces and areas
45.
Sauna heaters shall be installed according to the manufacturer's instruction, and must be equipped with a thermostat which will limit room temperature to what degrees F?
a)
194
b)
175
c)
162
d)
128
46.
Old copper tubing that has become brittle would require ____ before it can be flared satisfactorily?
a)
clean and de-burr
b)
double flare
c)
slightly swage
d)
annealing
47.
It is required that combustion air entering and leaving a furnace to be keep 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
48.
Authorized personnel must inspect excavations, when is it necessary to inspect such excavations?
a)
at least every other day
b)
for flagging
c)
after every rainstorm
d)
at least once a week
49.
The absorption of heat takes place in which component of a mechanical refrigeration system?
a)
evaporator
b)
condensor
c)
compressor
d)
metering
50.
The main function of an electric defrost termination thermostat is to
a)
setr the amount of defrost time
b)
prevent evaporator overheating
c)
start the evaporator fan
d)
restart the compressor
51.
How is a fan motor connected electrically to the compressor (for an outdoor fan motor)?
a)
In parallel and controlled by refrigerant control.
b)
In parallel and controlled by thermostat.
c)
In series and controlled by refrigerant control.
d)
In series and controlled by thermostat.
52.
The installation of dryer exhaust, of commercial clothes dryers, shall have ducts with a cleatance of AT LEAST ____ inches to combustible materials.
a)
3 inches
b)
1/2 inchh
c)
12 inches
d)
6 inches
53.
Heat leakage can also be computed using the thermal resistance of a structure. Thermal resistance known as the ____.
a)
F
b)
K
c)
U
d)
R
54.
In a ___ refrigerant system, two or more refrigerating systems are connected. In this type of system, both the evaporator and the condenser, operate at the same time.
a)
supercool system
b)
recoil system
c)
cascade system
d)
multiflow system
55.
What would happen if the valve on a refrigerant cyclinder is slowly opened and the rate of flow was increased?
a)
pressures of the liquid refrigerant will raise
b)
the increase in the rate of evaporation raises the temperature of the refrigerant and the cylinder
c)
more molecules are escaping from the the liquid into the vapor and the temperature will stay low
d)
the number of molecules flying into the vapor state and returning into the liquid, and the liquid molecules flying into the vapor state are equal.
56.
Condensate from all cooling coils and evaporators shall be conveyed from the drain pan outlet to an approved place of disposal. Such piping shall maintain a minimum horizontal slope in the direction of discharge of NOT LESS than ___ unit vertical in 12 units horizontal.
a)
1/4 inch
b)
3/8 inch
c)
1/8 inch
d)
1/10 inch
57.
Select the number of psi, without going over the limit, an acetylene manifold pressures must be at.
a)
5 psi
b)
20 psi
c)
15 psi
d)
10 psi
58.
Friction loss is typically expressed in units of inches of water column per
a)
50 feet of duct.
b)
75 feet of duct..
c)
100 feet of duct.
d)
150 feet of duct.
59.
Most commercial refrigerating systems use hot gas mufflers for comfort cooling in air conditioning. Mufflers are usually installed near the condenser, usually vertically. A muffler that is not installed correctly could trap what?
a)
refrigerant
b)
dangerous vapors
c)
oil
d)
hot suction gasses
60.
It is important to remember that heating output, in air-to-air heat pump, is directly related to _____.
a)
atmospheric pressure
b)
water temperature
c)
heat strip amps
d)
ambient temperature
61.
Equipment and appliances having an ignition source shall be elevated such that the source of ignition is not less than ___ above the floor in hazardous locations and public garages, and motor fuel-dispensing facilities.
a)
6"
b)
12"
c)
18"
d)
20" or more
62.
What determines the temperature at which a refrigerant will vaporized?
a)
volume
b)
temperature
c)
pressure
d)
enthalpy
63.
A flame on one end heats an iron bar. By what means does the heat travel through the bar?
a)
convection
b)
conduction
c)
radiation
d)
microwave
64.
Absolute pressure equals gauge pressure plus atmospheric pressure, therefore which formula is correct?
a)
psi + 10 = psia
b)
psi - 10 = psia
c)
psi +15 = psia
d)
psi - 15 = psia
65.
What is the function of a receiver-drier?
a)
to separate oil
b)
to store refrigerant
c)
to condense refrigerant
d)
to absorb heat
66.
The passing of outside air into a building or cabinet through doors, cracks around windows, and other openings are examples of
a)
radiation
b)
ventilation
c)
transmission
d)
infiltration
67.
Combustion is a chemical process of rapid oxidation in which fuel and oxygen produce
a)
energy.
b)
water vapor.
c)
carbon dioxide.
d)
heat and light
68.
When a roof-mounted furnace requires a working platform, the sides of the platform facing roof edge below shall be protected by a substantial railing having a minimum height of ___ inches.
a)
24
b)
30
c)
36
d)
42
69.
When a fire damper is installed in an air duct, it shall be provided with ___.
a)
a tight fitting access door
b)
a minimum of three inch insulation on all sides
c)
a minimum of 26 gauge sheet metal on all sides
d)
an alarm to a central system indicating activation
70.
Which of the following can help reduce infiltration?
a)
tint windows
b)
increase roof overhang
c)
inside positive pressure
d)
increase thermal conductivity insulation
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