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HVAC FC 01

Total questions: 69

Worksheet time: 35mins

Name
Class
Date
1.
Choose the correct description for scroll compressors:
a)

There is less vibration than from a reciprocating compressor.

b)

Both scrolls remain stationary during operation.

c)

There are more moving parts than in reciprocating compressors.

d)

They are noisy.

2.
When adjusting superheat setting with a thermal expansion valve, what effect does increasing the superheat have on the system?
a)

starves the evaporator

b)

floods the evaporator

c)

cools the evaporator

d)

none of the above

3.
Heat exists down to absolute zero which is measured at a temperature of
a)
-400 degrees F
b)
-420 degrees F
c)
-440 degrees
d)
-460 degrees F
4.
Return air openings for heating, ventilation and air-conditioning systems shall not be taken from a closet, bathroom, toilet room, kitchen, garage, boiler room, furnace room or unconditioned attic, however, a ___ is not prohibited.
a)

boiler room

b)

furnace room

c)

unconditioned attic

d)

bedroom

5.
As outlet ____ the crankcase pressure regulator opens?
a)

As oulet pressure decreases

b)

As outlet pressure increases

c)

As oulet temperature decreases

d)

As outlet temperature increases

6.
From the list below, select the BEST definition of a vibration absorber:
a)

It is recommended to compress the vibration absorber while installing

b)

The flexible absorber should be fastened to the unit or to a wall at the end pointing away from the vibration source

c)

Only one should be placed on line

d)

They should not be placed on compressor suction lines near the condenser

7.
An adjustable V-pulley for a belt drive motor is moved FURTHER from the other flange. This change will widen the pulley giving the effect of a smaller diameter pulley. The fan speed will
a)

decrease

b)

increase

c)

double

d)

triple

8.
Clear space above ground of the lowest portion of mechanical equipment suspended from a floor shall be AT LEAST ___ inches.
a)
6
b)
4
c)
10
d)
8
9.
What instrument measures moisture in the air?
a)

manometer

b)

hygrometer

c)

pitot tube

d)

anemometer

10.
What is any portion of a refrigerating system under condenser pressure?
a)

cooling system

b)

circulating system

c)

high side

d)

low side

11.
According to the International Mechanical Code, what minimum width unobstructed access must be provided on all sides of boilers?
a)

16 inches

b)

18 inches

c)

24 inches

d)

30 inches

12.
A permanent factory-applied nameplare (s) shall be affixed to appliances on which shall appear in legible lettering. From the list below, choose the one item that DOES NOt need to be included on the nameplate.
a)

required clearances from combustible construction

b)

type of fuel approved

c)

control schematic

d)

fuel rating in Btu/h

13.
What are the U-value and R-value of 4" thick concrete flooring, with no finish?
a)
U=0.650 R=1.54
b)
U=0.310 R=3.23
c)
U=0.136 R=7.93
d)
U=0.620 R=1.61
14.
Among the different types of eye protection, persons who wear glasses should avoid using:
a)
protective goggles with general magnification lenses
b)
spectacles with lenses that are both corrective and protective
c)
protective goggles worn over corrective spectacles
d)
corrective lenses mounted inside protective goggles
15.
Conduction is the flow of heat between parts of a substance by molecular vibrations. Heat causes solids to become liquid or gases, and conduction travels from
a)

between objects that are indirectly connected

b)

between materials that are insulated

c)

from larger to smaller objects

d)

from warmer to colder objects

16.
Air being conveyed from a heat exchanger to an area used for human habitation is defined as ____ air.
a)

return

b)

supply

c)

makeup

d)

combustion

17.
In a multiple temperature installation, which components are used to eliminate a short cycle condition due to pressure fluctuations?
a)

surge tanks

b)

check valves

c)

solenoid valves

d)

two temperature valves

18.
Chimneys and vents topic: a vent connector shall NOT BE SMALLER than the size of ___ according to the appliance manufacturer instructions.
a)

the flue collar of the appliance it serves

b)

3 inches

c)

4 inches

d)

6 inches

19.
The amount of heat conducted through a structure for a given unit of time is referred to as the
a)
U value
b)
R Value
c)
heat transfer rate
d)
infiltration rate
20.
In a residential building, the minimum wall thickness of an 8-inch round aluminum duct must be what minimum gauge thickness?
a)
24
b)
26
c)
28
d)
30
21.
Following IMC specifications, duct linings shall be ____ at the area of operation of a fire damper showing a minimum number of inches upstream and downstream of electric-resistance and fuel-burning heaters in a duct system
a)
interrupted
b)
doubled
c)
fireproofed
d)
continuous
22.
A ton of refrigeration equals
a)

240,000 BTU per day

b)

288,000 BTU per day

c)

300,000 BTU per day

d)

360,000 BTU per day

23.
What effect does a thermostatic expansion valve with a discharged power element have on an evaporator?
a)

saturates the evaporator with refrigerant

b)

liquid in suction line

c)

a high suction pressure

d)

a starved evaporator

24.
In an R-22 system, evaporator pressure is 60 pounds. What is the corresponding saturated refrigerant temperature?
a)

34 degrees F

b)

40 degrees F

c)

45 degrees F

d)

55 degrees F

25.
When louver and grill design and free area are NOT known, what design should be used for combustion openings?
a)

All louvers must have a 50% free area.

b)

All louvers must be in a fixed open position.

c)

Metal louvers will have a 25% free area and wood louvers will have a 75% free area.

d)

Wood louvers will have a 25% free opening and metal louvers will have a 75% free opening.

26.
The measurement of which flue gas is an indicator of the efficiency of the combustion process?
a)

N (nitrogen)

b)

CH4 (methane)

c)

CO (carbon monoxide)

d)

CO2 (carbon dioxide)

27.
MAXIMUM horizontal hanger spacing for steel pipe for a hydronic system is ____.
a)
16 feet
b)
20 feet
c)
8 feet
d)
12 feet
28.
A contractor is working with auxiliary drain pans in a secondary drain system for an air conditioning system. How deep should be these auxiliary drain pans, AT LEAST?
a)

1-1/2 inches

b)

1-1/4 inches

c)

2 inches

d)

1-3/4 inches

29.
What type of device senses an off limit condition, and shuts down the offending piece of equipment in order to prevent a hazardous condition?
a)

an intermittent pilot

b)

an interrupted pilot

c)

a purge

d)

an interlock

30.
Most copper tubing used in air conditioning and refrigeration work is know as ACR tubing, available om soft and hard types. According to the Modern Refrigeration and Air Conditioning textbook, what is the most common type of ACR copper tubing used in the industry today?
a)
D
b)
M
c)
K
d)
L
31.
What does a sling psychrometer measure directly?
a)

temperature and dew point

b)

heat and cold

c)

gain and drops

d)

wet bulb and dry bulb

32.
Smoke dampers, as referenced in the mechanical code, are intended to restrict the ___.
a)

spread of smoke through the duct in an air-handling system

b)

discharge of smoke through smoke-evacuation systems in atriums

c)

operating temperature of unlisted high-heat solid-fuel-burning appliances

d)

amount of smoke exhausted by commercial kitchen hood-ventilation systems

33.
A substance used to produce refrigeration by its expansion or vaporization is
a)

brine

b)

an element

c)

a refrigerant

d)

a sodium solution

34.
Grease ducts servicing Type 1 hoods shall be constructed of stainless steel having a MINIMUM thickness of ____.
a)

18 gauge

b)

20 gauge

c)

22 gauge

d)

16 gauge

35.
According to OSHA regulations, before connecting a regulator to a fuel gas cylinder valve, what must take place?
a)

Crank the seal with a metal rod.

b)

Tap the regulator with wrench to loosen any dust or dirt on it.

c)

Open the valve quickly until a cracking sound is heard.

d)

Open the valve slightly and close it immediately.

36.
Good practice demands that when a tube constrictor is used to prep a brazed joint, the tubes should be as close as ___ to each other.
a)

.003"

b)

.033"

c)

.300"

d)

.303"

37.
If an HVAC system frequently turns off and on without running the complete programmed cycle, the technician should locate the thermostat for inspection. A thermostat that is exposed to vibration may cause the system to ______.
a)

create temperature lag

b)

short cycle

c)

overshoot the intended destination

d)

overcurrent

38.
What controls the temperature difference between the cut-out and the cut-in settings in a temperature control mechanism?
a)

mercury switch

b)

range adjustment

c)

thermostatic adjustment

d)

differential adjustment control

39.
The degree-day method is used for determining fuel consumption and heating cost during a season. The method uses what indoor temperature as a standard?
a)

72 degrees F

b)

65 degrees F

c)

48 degrees F

d)

32 degrees F

40.
What is the effect of sensible heat?
a)

it changes the state of a substance without changing its temperature

b)

it changes the temperature of a substance without changing its state

c)

it changes both the state of a substance and its temperature

d)

it does not change the temperature or the state of a substance

41.
The one component that should be located between a filter-drier and a metering device is a sight glass. However, caution must be taken when brazing the sight glass as a temperature of ____ or higher can adversely affect the color-changing element.
a)

275 degrees F

b)

255 degrees F

c)

235 degrees F

d)

215 degrees F

42.
Joints between chilled water systems and other metallic piping shall be made with ___.
a)

brazed joints

b)

galvanic fittings

c)

welded joints

d)

di-electric fittings

43.
At what degrees Fahrenheit below the desired evaporator outside surface temperature should the cut out pressure of a pressure motor control be set?
a)

5

b)

10

c)

15

d)

20

44.
Scheduled or maintenance of a refrigeration system may require welding or brazing, what would be the largest concern with respect providing sufficient ventilation?
a)

the reduction of oxygen would make it hard to breath

b)

heat generated could injure personnel

c)

flourocarbons may become toxic

d)

carbon monoxide may form

45.
According to the International Mechanical Code, plans submitted for a permit from the department having jurisdiction must show in detail the scope of work, that it complies with code, the location of equipment and ______.
a)

be drawn to scale

b)

have three or more sets

c)

be submitted electronically

d)

be drawn on paper or canvas

46.
A technician is installing an electrical-powered appliance. A guardrail will be installed later on. International Mechanical Code must be implemented. The roof is 8 ft. above the grade be;ow. What would be the LEAST distance between the appliance and the roof edge?
a)
8 feet
b)
10 feet
c)
6 feet
d)
4 feet
47.
Proper thermostatic expansion valve sensing bulb placement is dependent on
a)

line size and refrigerant type.

b)

refrigerant type only.

c)

line size only.

d)

oil type only.

48.
AT Least, how many clearance space should be available for the supply and return air ducts for a warm-air furnace?
a)
6 square feet/1,000 Btu/h
b)
6 square inches/1,000 Btu/h
c)
2 square feet/1,000 Btu/h
d)
2 square inches/1,000 Btu/h
49.
What control device de-energizes the compressor when the pressure falls below set point?
a)

low pressure

b)

low ambient control

c)

discharge relief valve

d)

crankcase pressure regulator

50.
Of the three types of condensers used in HVACR applications, which one is MOST affected by low ambient temperature?
a)

water cooled condenser

b)

air cooled condenser

c)

evaporative condenser

d)

coil and shell condenser

51.
What is the applied voltage across an electric heater with a total current draw of 22 amperes and a resistance of 11 ohms?
a)
230
b)
240
c)
242
d)
248
52.
Which instrument is used to obtain air velocity values?
a)

hydrometer

b)

pedometer

c)

odometer

d)

anemometer

53.
What will be the result ia a thermostatic expansion valve is oversized for a system?
a)

The evaporator will frost.

b)

The evaporator will have a colder temperature.

c)

The evaporator will have a warmer temperature.

d)

The evaporator will alternately be overfed and starved.

54.
Absorption systems are used successfully for air conditioning comfort cooling installations. MOST of these systems use ___ as the refrigerant, and various chemicals as the absorber.
a)

freon

b)

helium

c)

water

d)

nitrogen

55.
What would be the approximate Dry Bulb temperature of a system, given a wet bulb temperature of 65 degrees F, and a relative humidity of 60%?
a)
65 degrees
b)
70 degrees
c)
75 degrees
d)
80 degrees
56.
Select the LEAST unobstructed area of supply and return ducts approved for a warm air furnace.
a)
6 square inches/1,000 Btu
b)
6 square feet/1,000 Btu
c)
2 square inches/1,000 Btu
d)
2 square feet/1,000 Btu
57.
Capillary tube capacity is determined by the pressure difference, length of the tube, and inside diameter of the tube. What size length tube would be required given the following: -high-temperature R-22 system -1/2-horsepower compressor
a)
108-inch length and .064 ID.
b)
98-inch length and .052 ID.
c)
88-inch length and .040 ID.
d)
78-inch length and .031 ID.
58.
For occupancy safety compliance, how are refrigeration systems classified?
a)
application
b)
type of refrigerant
c)
toxicity of refrigerant
d)
degree of probable leakage
59.
The ____ shall be separated from the plenum by a thermal barrier complying with the International Building Code.
a)

fire sprinkler piping

b)

foam plastic insulation

c)

pneumatic tubing

d)

wiring

60.
When starting up a new unit, what proceedure should be done first?
a)

open service valves and liquid line valve

b)

charge system

c)

check voltage

d)

jumper out low pressure control

61.
A 2,000-square foot dry cleaning area utilizing a Type II dry cleaning system requires a MINIMUM exhaust air of ___.
a)
4,000 cfm
b)
5,000 cfm
c)
3,000 cfm
d)
2,000 cfm
62.
In a boiler system, the discharge piping from safety valves and safety relief valves shall
a)

be securely anchored and supported

b)

have no more than 2 elbows

c)

terminate within 60 inches of the floor

d)

have a minimum diameter of 1"

63.
To cool down 20 pounds of water from 85 degrees F to 45, how much heat must be removed?
a)
1,600 Btu.
b)
1,500 Btu.
c)
1,200 Btu.
d)
800 Btu.
64.
How many floors are unlisted, single wall metal chimney (connectors) permitted to pass through?
a)

0

b)

1

c)

2

d)

3

65.
In order to balance the system pressure and crankcase in a hermitically sealed compressor unit what must be done?
a)

Shut system down.

b)

Install a thermostatic expansion valve.

c)

Cycle system several times.

d)

Service the evaporator.

66.
A service technician is trying to fix a STICKING relay. What should be done in this situation?
a)

file points

b)

replace it

c)

lubricate slide

d)

clean terminals

67.
Which of the following refrigerant control devices cannot be adjusted?
a)

electric solenoid valve

b)

capillary tube

c)

automatic expansion valve

d)

thermostatic expansion valve

68.
The thicker the insulation the less heat will flow through it. If the insulation thickness is doubled (i.e. 1" to 2" thick), what will be the resultant heat flow?
a)

1/4 the amount of heat

b)

1/3 the amount of heat

c)

3/8 the amount of heat

d)

1/2 the amount of heat

69.
Flexible air ducts, both metallic and non-metallic, shall be ____.
a)

not be limited in length

b)

limited to 6 feet in length

c)

limited to 12 feet in length

d)

limited to 15 feet in length

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