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Practice HVAC Licensing Exam. This exam is based on the International Mechanical and Fuel Gas Codes. Manuals J and D and NASCLA's 'Guide to Contractor's Business and Project Management'
1.
Unless otherwise approved, ducts shall not be instlalled within ____ inches of earth.
a) 4
b) 3
c) 5
d) 6
2.
(2006 IMC or earlier)When obtaining combustion air from a crawl space, the free area of the crawl space vent to the outside must be a minimum ________ the size of the combustion air opening. (2006 IMC or earlier)
a) 4 times
b) 2.5 times
c) 3 times
d) 2 times
3.
1/2" copper tubing must be supported a minimum of _______ feet when installed horizontally
a) 4
b) 10
c) 8
d) 6
4.
THE AMERICANS WITH DISABILITIES ACT APPLIES TO ALL EMPLOYERS WHO HAVE _______ OR MORE EMPLOYEES
a) 25
b) 15
c) 50
d) 10
5.
When using a test pressure of 10 psig, the test guage shall not be capable of reading pressures greater than_____PSIG
a) 100
b) 80
c) 50
d) 75
6.
A single wall low heat 6 inch diameter chimney connecter shall have a minimum thickness of ______
a) 22
b) 16
c) 26
d) 24
7.
The maximum cfm of duct leakage allowed with a air handler in place for a 1500 square foot home with .1 inch w.g. is____.
a) 75
b) 150
c) 60
d) 80
8.
Gas piping may be joined in concealed locations using which of the following methods?
a) brazing
b) compression fittings
c) unions
d) swing joints
9.
Gas piping shall be labeled at intervals not exceeding ______ feet
a) 8
b) 5
c) 4
d) 3
10.
Vented wall furnaces shall be located so that a door cannot swing within _____ inches of the air inlets or outlets of such furnace measures at right angles to the openings
a) 12
b) 18
c) 36
d) 24
11.
Copper piping shall not be used if the gas contains more than __ grains of hydrogen sulfide per 100 standard cubic feet.
a) .3
b) 3
c) .5
d) 6
12.
A plastic condensate pan must have a minimum thickness of ______ inch
a) .0250
b) .0625
c) .0375
d) .0276
13.
A CUSTOMER MOVES UP FROM AN 8 SEER TO A 13 SEER AIR CONDITIONER. WHAT WOULD HIS YEARLY SAVING BE IF HE WAS PAYING $650 PER YEAR FOR AIR CONDITIONING
a) $197
b) $325
c) $250
d) $260
14.
A floor furnace shall be placed such that a drapery can be no nearer than ______ to the register of the furnace
a) 18
b) 12
c) 6
d) 8
15.
An auxiilary drain pan must have a minimum depth of ____ inche/s
a) 1.5
b) 1
c) 1.25
d) 2
16.
Unless welded or placed in a ventilated shaft, the maximnm operating pressure of gas piping in a residence shall not exceed _______ psig
a) .5
b) 10
c) 2
d) 5
17.
Grease ducts in enclosures shall have a clearance of ________ inches to construction of non combustible gypsum attached to non combustible structures
a) 18
b) 12
c) 6
d) 3
18.
If an 6" X 10" duct is terminated with a metal louver (75% free area), the louver must be a minimum _____ square inches
a) 90
b) 60
c) 120
d) 80
19.
The minimum R value of duct insulation installed in areas other than the conditioned space or attics is _________
a) R 5
b) R 6
c) R 8
d) R 4
20.
REFRIGERANTS REMOVED FROM A SYSTEM IN ANY CONDITION WITHOUT NECESSARILY TESTING OR PROCESSING THEM ARE CALLED___________.
a) RECYCLED REFRIGERANTS
b) RECIEVED REFRIGERANTS
c) RECOVERED REFRIGERANTS
d) RECLAIMED REFRIGERANTS
21.
Brazing alloys used on gas piping shall not contain more than_____ percent phosphorus
a) .005
b) .5
c) 5
d) .05
22.
Type I grease ducts shall have a clearance of _____ inches to combustible construction
a) 18
b) 3
c) 6
d) 12
23.
THE MINIMUM INSULATION R-VALUE FOR REFRIGERANT LINES FOR A RESIDENCE IS ____.
a) R-3
b) R-2
c) 5-5
d) R-4
24.
THE MAXIMUM HORIZONTAL LENGTH OF A SINGLE WALL CONNECTOR IS ______% OF THE HIEGHT OF THE CHIMNEY OR VENT.
a) 50
b) 100
c) 75
d) 150
25.
Plastic pipe shall not be operated at pressures greater than ______ psig for LP gas
a) 100
b) 15
c) 30
d) 10
26.
The highest point of an attic must be at least ___inches in order to be used as a source for combustion air
a) 28
b) 30
c) 24
d) 36
27.
Which of the following must have a flame spread distance no greater than 5 feet when intalled in plenums.
a) pneumatic tubing
b) wiring
c) all the above
d) fire sprinkler piping
28.
Screens used to protect intake openings for ventilation may not have a mesh less than____ inch.
a) 1/16
b) 1/2
c) 1/8
d) 1/4
29.
Exhaust outlets that terminate above a roof shall have a discharge outlet not less than ___ inches above the roof surface
a) 36
b) 30
c) 48
d) 40
30.
CATEGORY I GAS EQUIPMENT MAY BE VENTED WITH WHICH OF THE FOLLOWING TYPES OF VENTS?
a) ALL THE ABOVE
b) CHIMNEY WITH CLAY LINER
c) TYPE B
d) SINGLE WALL METAL
31.
+RECLAIMED REFRIGERANTS SHALL NOT BE REUSED IN A DIFFERENT OWNERS EQUIPMENT UNLESS TESTED AND FOUND TO MEET THE PURITY REQUIREMENTS OF
a) ARI 700
b) ASTM A53
c) NFPA 54
d) ASHRAE 34
32.
A 30' X 8' PARTITION (2 X 4 STUDS, GYPSUM ON BOTH SIDES, NO INSULATION) SEPARATES TWO ROOMS HAVING A TEMPERATURE DIFERENCE OF 20 DEGREES. WHAT IS THE WINTER HEAT LOSS THROUGH THE PARTITION?
a) 3,535 BTUH
b) 15,360 BTUH
c) 1,512 BTUH
d) 2,609 BTUH
33.
THE LARGEST A BORED HOLE MAY BE IN A 2' x 9.5" joist
.33 x 9.5 =3.13
a) 2"
b) 3.13"
c) 3"
d) 2.85"
34.
The minimum ventilation rate for living area of a residence is the greater of 15 cfm per person or ____ air changes per hour
a) .5
b) .35
c) .40
d) 1
35.
When mechanically ventilating a 1500 square foot conference room in an office building, how many CFM of outdoor air are required?
a) 375
b) 1000
c) 50
d) 3000
36.
A vertical pipe supplying gas is a________
a) riser
b) leader
c) upright
d) standpipe
37.
IF A CONTRACTOR WORKS ON 15% PROFIT, WHAT WOULD HIS SALES HAVE TO BE TO MAKE $75,000?
a) $600,000
b) $112,000
c) $500,000
d) $862,500
38.
Which of the following heating systems must have its efficiecy posted on a certificate placed on or inside the electircal distribution panel of new residential construction
a) Electric baseboard
b) unvented room heater
c) gas furnace
d) electric furnace
39.
A commercial stainless steel duct must be constructed of ______ gage thickness
a) 20
b) 14
c) 18
d) 16
40.
A gas line serving a grill may be installed a minimum ______ inches beow grade as long as it is approved and not susceptible to physical damage
a) 8
b) 12
c) 6
d) 16
41.
For other than appliances installed in fireplaces, a gas shutoff valve shall be located within ___feet of the appliance
a) 3
b) 4
c) 10
d) 6
42.
Downdraft kitchen exhaust ducts may be constructed of______.
a) all of the above
b) sheet metal
c) aluminum
d) PVC
43.
Passageways in attics shall not be less than _____ inches wide
a) 24
b) 20
c) 30
d) 22
44.
A vent is not _____
a) site made
b) a passage way for carrying combustion products
c) factory made
d) listed and labeled
45.
A GAS FIRED APPLIANCE RATED AT 75,000 BTUH INPUT MUST BE PLACED IN A ROOM CONTAINING A MINIMUM ______ CUBIC FEET IF OUTDOOR COMBUSTION AIR IS NOT INTRODUCED.
a) 3750,
b) 7500
c) 1500
d) 75000
46.
Shield plates placed on studs to protect gas piping shall extend _____ inches to each side of the stud.
a) 1.5
b) 3
c) 4
d) 2
47.
Close dryers exhausting more than ____ cfm must be provided with make up air
a) 150
b) 100
c) 200
d) 75
48.
A 2 inch diameter gas pipe must be purged with an inert gas before opening if it is greater than _____feet long.
a) all of the above
b) 30
c) 50
d) 40
49.
The unthreaded portion of a gas piping outlet shall not extend less then ______inches through a slab floor
a) 1.5
b) 3
c) 2
d) 1
50.
Equipment, appliances or material included in a list published by a nationally recognized testing laboratory concerned with product evaluation and states that the above item meets recognized standards is said to be _____________
a) approved
b) listed
c) certified
d) tested
51.
The maximum size unvented gas heater that may be installed in a residential bathroom measuring 1600 cubic feet is________bthu
a) 8000
b) 4000
c) 3000
d) 6000
52.
IF A GALLON OF OIL CONTAINING 140,000 BTU'S SELLS FOR $1.25, HOW MUCH WILL 1,000,000 BTU'S COST WHEN USED IN AN 80% AFUE OIL FURNACE
a) $8.93
b) $11.16
c) $14.00
d) $12.78
53.
A type I hood is not required for _______>
a) griddles
b) hot dog cookers
c) fryers
d) broilers
54.
A location that cannot be accessed without damageing permanent parts of a building is called a/an _____ location
a) unaccessible
b) assessible
c) concealed
d) ready access
55.
section 309 IMC
A home must be provided with a space heating system capable of maintaing a minimum indoor temperature of _____ degree at a point 3 feet obove the floor level on a design heating day
a) 78
b) 70
c) 75
d) 68
56.
The minimum allowable HSPF rating of an air cooled residential heat pump is _________
a) 7.0
b) 8.2
c) 8.8
d) 7.7
57.
THE VELOCITY OF 250 CFM OF AIR IN A FLEXIBLE, SPIRAL WIRE HELIX CORE DUCT SIZED AT .08" WC STATIC PRESSURE IS ______.
a) 500 FPM
b) 900 FPM
c) 400 FPM
d) 750 FPM
58.
A label shall be afixed to a gas appliance with all the following information except _______
a) BTUH rating
b) manufacture date
c) type of fuel used
d) minimum clearances
59.
Where holes or notches for gas tubing are less than 1.5 inches from the nearest edge of a wood stud, they must be protected by metal shields not less than ____inch thick.
a) 1/8
b) 1/32
c) 1/16
d) 1/4
60.
Appliances install ei public garages, shall be no less than _____ above the floor
a) 8 ft.
b) 18 inches
c) 7 ft.
d) 6 ft.
61.
THE DISTANCE FROM A METER TO A NATRUAL GAS WATER HEATER (40,000 BTUH) IS 30 FEET. 20 FEET FURTHER DOWN THE LINE IS A FURNACE (120,000 BTUH). WHAT IS THE MINIMUM PI[E SIZE THAT MUST BE USED BETWEEN THE WATER HEATER AND FURNACE? (PRESSURE LESS THAN 2 LBS, PRESSURE DROP = .05)?
a) 1/2"
b) 3/4"
c) 1"
d) 3/8"
62.
THE MAXIMUM ALLOWABLE HORIZONTAL LENGTH OF A CATEGORY I APPLIANCE SINGLE WALL VENT CONNECTOR IS _______% OF THE HEIGHT OF THE VENT
a) 50
b) 25
c) 75
d) 100
63.
Duct insulation shall have the R value printed every_________ inches
a) 60
b) 36
c) 48
d) 24
64.
A 12" ROUND DUCT HAS A RECTANGULAR EQUIVALENT OF
a) 16 X 8
b) 15 X 8
c) 14 X 8
d) 17 X 8
65.
Which of the following gas piping materials shall not be used in exterior locations or underground
a) steel
b) plastic
c) brass
d) aluminum
66.
Appliance pits greater than 12 inches deep shall be lined with masonry extending ___inches above the adjoining grade
a) 4
b) 2
c) 3
d) 6
67.
Appliances installed on roofs greater than ______ feet high must have a permanent means of access.
a) 18
b) 20
c) 16
d) 24
68.
For 3/4 inch steel gas pipe hangers or supports shall be spaced not farther than _____feet apart
a) 10
b) 4
c) 8
d) 6
69.
Which of the following is not required for a heat pump installation
a) load calculation
b) programmable thermostat
c) a permit
d) a means of controling electric resistance heat from operating when the heat pump can handle the load
70.
A HOUSE HAS A HEAT LOSSS OF 48,000 BTUH AT 20-DEGREE OUTDOOR TEMPERATURE. WHAT IS THE HEAT LOSS AT 40-DEGREE OUTDOOR TEMPERATURE?
a) 18,000 BTUH
b) 124,000 BTUH
c) 19,200 BTUH
d) 28,800 BTUH
71.
A system desgned to shut off the gas supply to the burners if the oxygen in the surrounding atmosphere is reduced to a predetermined level is called a ___________
a) carbon dioxide detector
b) oxygen depletion shutoff system
c) automatic shut of valve
d) air regulator system
72.
A FUEL FIRED FURNACE, MEASURING 22 CUBIC FEET MUST BE PLACED IN A ROOM GREATER THAN __________ CUBIC FEET IF IT IS NOT APPROVED FOR CLOSET INSTALATION. Note: this provision not in 2021 Code
a) 264
b) 352
c) 220
d) 564
73.
Unless protected by approved area smoke detectors, smoke dedectors are required in the return air duct or plenum on any system with a design capacity greater than _______cfm.
a) 1500
b) 2000
c) 4000
d) 3000
74.
FLEXIBLE GAS APPLIANCE CONNECTORS SHALL NOT PASS THROUGH WHICH OF FOLLOWING.
a) WALLS
b) CEILINGS
c) APPLIANCE HOUSINGS
d) FLOORS
75.
The minimum gage for a 14 inch round galvanized air duct is ___.
a) 30
b) 28
c) 26
d) 24
76.
section 307 IMC
Condensate piping must no be less than _____ inch diameter
a) 3/4
b) 1/2
c) 5/8
d) 1
77.
FOR A BUILDING TO BE MAINTAINED AT 70 F, HOW MANY BTUH ARE REQUIRED TO OFFSET 300 CFM OF 20 F OUTDOOR VENTILATION?
a) 16,500
b) 6,600
c) 6,000
d) 1.400
78.
A DOUBLED UP STUD IN A LOAD BEARING WALL MAY HAVE A HOLE BORED UP TO ______% OF IT DEPTH
a) 25
b) 40
c) 60
d) 15
79.
When cutting threads, a 3/4 inch pipe shall have approximately _______ treads cut
a) 12
b) 11
c) 10
d) 13
80.
A NON LOAD BEARING STUD MAY BE NOTCHED ______% OF ITS DEPTH.
a) 30
b) 40
c) 25
d) 15
81.
WHAT IS THE VELOCITY OF 1400 CFM OF AIR IN A DUCT MEASURING 12" X 30"?
a) 467 FPM
b) 560 FPM
c) 3.8 FPM
d) 360 FPM
82.
Gas piping installed underground beneath buiding may not be incased in _________.
a) cement
b) steel pipe
c) plastic pipe
d) wrought iron conduit
83.
Pressure sensitve tapes used on flexible ducts shall be marked ______
a) UL 181 A
b) UL 181-FX
c) UL 181 A-P
d) UL 181 B-FX
84.
An appliance that causes a positive vent pressure and produces excessive condensation in the vent is a Catagory ______ appliance
a) II
b) IV
c) I
d) III
85.
Sauna heaters shall have a thermostat that limits the room temperature to _______ degrees F
a) 194
b) 144
c) 114
d) 120
86.
The maximum operating pressure of LP gas systems shall not exceed ____ unless the building or area is constructed according to NFPA 58, Chapter 10
a) 10
b) .5
c) 5
d) 20
87.
The control side of a floor furnce must have a minimum _____inches clearance
a) 24
b) 18
c) 20
d) 12
88.
A ventilation system in a 20,000 squire foot enclosed parking garage shall be capable of producing a minimum of _____ cfm at full load.
a) 15,000
b) 20,000
c) 5000
d) 10,000
89.
A HEAT PUMP IN A RESIDENCE MUST BE CONTROLLED BY WHICH OF THE FOLLOWING?
a) A PROGRAMABLE THERMOSTAT
b) A DEVICE TO PREVENT SUPPLEMENTARY HEAT FROM COMING ON IF HEAT PUMP CAN HANDLE THE LOAD ALONE
c) A DEVICE THAT ALLOWS SUPPLEMENTARY HEAT OPERATION DURING DEFROST CYCLES EXCEEDING 15 MINUTES
d) A FOSSIL FUEL KIT
90.
The maximum length allowed fo a 4 inch dryer duct with two 90 degree bends is ______ feet
a) 25
b) 35
c) 30
d) 40
91.
NEED HELP WITH THIS PRACTICE TEST? CHECK OUT www.hvaclicensing.com
a) WELDED
b) MECHANICAL
c) BRAZED
d) SOLDERED
92.
Duct insulation installed within ____inches of a type I hood shall be noncombustibl orf be listed for the the application
a) 18
b) 6
c) 12
d) 24
93.
Exhausted environmental air must be _____ feet from mechanical intakes
a) 12
b) 8
c) 3
d) 10
94.
A 500 SQUARE FOOT CONFERENCE ROOM REQUIRES _______CFM OF OUTDOOR VENTILATION
a) 500
b) 250
c) 750
d) 150
95.
hvac practice test
A tracer wire buried with plastic gas piping shall be minimum ___AWG
a) 16
b) 14
c) 18
d) 20
96.
A sauna room shall have a vent opening above the door at least 4 inches by ____ inches
a) 6
b) 12
c) 10
d) 8
97.
FUEL FIRED APPLIANCES SHALL NOT BE LOCATED IN _______.
a) BASEMENTS
b) BEDROOMS
c) LIVING ROOMS
d) KITCHENS
98.
The miminum size supply line to an oil furnace shall be _______ inch.
a) 1/8
b) 1/16
c) 3/8
d) 1/4
99.
A type I hood, 5 foot long, wall mounted canapy, serving medium-duty appliances shall have a minimum capacity of _____ CFM
a) 1000
b) 2500
c) 500
d) 1500
100.
Which of the follow shall not share a typeI hood
a) charcoal grille
b) griddle
c) deep fat fryer
d) pzza oven
101.
A CEILING HAS A TOTAL U-VALUE OF .07. WHAT IS THE NEW R-VALUE IF R-19 IS ADDED?
a) 33.28
b) 32.28
c) 30.28
d) 31.28
102.
A location that cannot be accessed without damageing permanent parts of a building is called a/an _____ location
a) concealed
b) assessible
c) unaccessible
d) ready access
103.
A gas regulator that reduces incoming pressure between .5 and 5 psig to a lower pressure is called a __________.
a) low pressure regulator
b) service entrance regulator
c) high pressure regulator
d) medium pressure regulator
104.
If natural ventilation is used, a building, measuring 3000 square feet, must have a minimum openable area of ______ square feet.
a) 120
b) 150
c) 300
d) 450
105.
Floor registers must support ______lbs consetrated load on a 2 inch disk appliedati its most critical area
a) 100
b) 250
c) 150
d) 200
106.
Liquid adhesive used on air filters shall have a flash point no lower than ______ degrees F
a) 230
b) 275
c) 250
d) 325
107.
The verical distance between the front lower lip of a type I or II hood and the surface of the appliance shall not extend more than ______ feet
a) 3.6
b) 4
c) 2
d) 3
108.
Duct lining shall be interupted _____ inches downstream of a duct heater
a) 6
b) 12
c) 10
d) 4
109.
This question eliminated
a) ?
b) ?
110.
Underfloor accesses must be a minimum 22 inches high by _______ inches wide
a) 30
b) 24
c) 28
d) 36
111.
IF PROTETION FROM VEHICLE IMPACT IS NOT PROVIDED, APPLIANCES INSTALLED IN PRIVATE GARAGES MUST BE INSTALLED _____ FEET ABOVE THE FLOOR.
a) 7
b) 6
c) 8
d) 5
112.
Flexible air ducts______.
a) shall not be limited in length
b) shall be limited to 14 feet in length
c) shall be labeled 181-B
d) May convey air at up to 275 degres
113.
When aluminum foil is used as a vapor retarder for duct insulation it must be minimum
_____ mils thick
a) 4
b) 2
c) 1
d) 6
114.
The vent cap of an oil tank must have a screen mesh no finer than No. _______
a) 10
b) 4
c) 6
d) 8
115.
IN A ROOM THAT IS LARGE IN COMPARISON WITH THE SIZE OF THE EQUIPMENT, AN APPLIANCE THAT REQUIRES 18" CLEARANCE ON ITS SIDES, MAY HAVE ITS CLEARANCE REDUCED TO ______ IF .024" SHEETMETAL WITH A VENTILATED AIR SPACE IS USED TO PROTECT THE COMBUSTIBLE SURFACE.
a) 6"
b) MAY NOT HAVE CLEARANCE REDUCED
c) 12"
d) 9"
116.
The minimum distance between the cooking surface and a grease filter serving burners with flames is _____ feet
a) 1
b) 3.5
c) .5
d) 2
117.
A fire damper install at a 2 hour fire rated wall shall have a minimum rating of _______ hours
a) 2
b) 1.5
c) 3
d) 1
118.
Unless otherwise specified by the manufacturer,B vents shall terminate not less than ______feet above the highest connected appliance
a) 12
b) 10
c) 8
d) 5
119.
Grease ducts shall provide an air velocity not less than _______ feet per minute
a) 400
b) 750
c) 250
d) 500
120.
The minimum cross-sectional dimension of a combustion air duct shall be ________ inches
a) 3
b) 8
c) 4
d) 6
121.
Unless protected fom vehicle impact, appliances shall be installed a minimum ______ feet above the floor of a private garage
a) 6
b) 5
c) 8
d) 9
122.
Duct smoke detectors shall comply with______.
a) UL 268
b) UL 181
c) ASTM 34
d) NFPA 72
123.
TWO NATURALLY VENTILATED APPLIANCES WITH A COMBINED CAPACITY OF 130,000 BTUH ARE CONNECTED TO A COMMON B-VENT, 18' HIGH WITH TWO 90-DEGREE ELBOWS. WHAT SIZE COMMON VENT SHOULD BE USED?
a) 5"
b) 7"
c) 4"
d) 6"
124.
section 504 IMC
Transition ducts used to connect commercial dryers to exhaust duct shall be limited to ___ feet in length
a) 4
b) 3
c) 6
d) 8
125.
WHAT IS THE DESIGN FRICTION RATE WHEN THE AVAILABLE STATIC PRESSURE FOR THE DUCT SYSTEMIS .36" WC AND THE RUN WITH THE LONGEST EFFECTIVE LENGTH IS 375 FEET?
a) .05" WC
b) .08" WC
c) .15" WC
d) .10" WC
126.
AN AIR CONDITIONER HAS HIGH SUCTION AND A LOW HEAD PRESSURES. WHAT WOULD BE A LIKELY CAUSE?
a) DIRTY CONDENSER COIL
b) DIRTY FILTERS
c) CLOGGED METERING DEVICE
d) BAD OR WEAK COMPRESSOR VALVES
127.
section 506 IMC ( 24 / 12 = 2, 2 x 1/4" = 1/2")
The slope of a 24 foot horizontal grease duct must be at least ___ inch.
a) 1/8
1/8
b) 1/4
c) 3/4
d) 1/2
128.
If a water level detection device is used in an auxiliary drain pan it must conform to_______.
a) ASTM 243
b) UL 508
c) UL 181
d) ASI 84
129.
Access points for inspecting and servicing fire dampers shall be labeled FIRE DAMPER with letters no tess than _____ inch/s high
a) .5
b) .75
c) 2
d) 1
130.
A gas regulator that reduces incoming pressure between .5 and 5 psig to a lower pressure is called a __________.
a) service entrance regulator
b) low pressure regulator
c) high pressure regulator
d) medium pressure regulator
131.
The use of gypsum boards to for plenums shall be limited to systems where the temperature does not exceed _______ degrees F and the temperature of the conveyed air is kept above the dew point
a) 125
b) 110
c) 250
d) 95
132.
Which rooftop appliance does not require guardrail protection?
a) one located 3 feet form roof edge
b) one located 6 feet from roof edge
c) one located 4 feet from roof edge
d) one locate 8 feet from roof edge
133.
Factory built fireplaces must be listed and labeled according to __________.
a) UL 348
b) UL127
c) UL 187
d) UL 124
134.
Closets containing close dryers must have a make up air opening not less than ____ square inches
a) 75
b) 100
c) 150
d) 50
135.
When combustion air is mechanically forced into a room, a minumum rate of 1 cfm per _____ btu/h of combined input rating of all installed appliances must be supplied. (2006 and earlier code)
a) 2400
b) 3400
c) 1000
d) 2000
136.
A 75,000 BTUH (INPUT RATING) 80% AFUE FURNACE HAS A TEMPERATURE RISE OF 45-DEGREES. WHAT IS THE CFM?
a) 1667
b) 1212
c) 1515
d) 1175
137.
___________ pipiing may only be used for gas piping outside and underground.
a) Aluminum
b) Copper
c) Steel
d) Plastic
138.
A CONTRACTOR PAYS $750 FOR A FURNACE PLUS 7% TAX. WHAT WOULD HIS SALES PRICE BE IF HE WISHED TO MAKE 30% GROSS PROFIT?
a) $1028
b) $1146
c) $1043
d) $975
139.
The minimum return opening to an 80,000 btuh (output rating) forced air furnace shall be _____ square inches.
a) 160
b) 80
c) 140
d) 100
140.
The minimum diameter of a close dryer duct shall be ______ inches
a) 6
b) 5
c) 3
d) 4
141.
IN ORDER TO SUPPLY OUTDOOR COMBUSTION AIR USING THE TWO OPENING METHOD WITH HORIZONTAL DUCTS, WHAT DUCT SIZE BELOW WOULD BE THE MINIMUM NEEDED TO HANDLE A 140,000 BTUH FURNACE
a) 3.5" X 10"
b) 8.5" X 10"
c) 7" X 10"
d) 14' X 10"
142.
THE MAXIMUM BTUH RATING OF AN UNVENTED GAS HEATER INSTALLED IN A 15 X 20 ROOM WITH 8 FOOT CEILINGS IS (infiltraion rate is greater than .40 ACH)?
a) 48,000
b) 40,000
c) 24,000
d) 6,000
143.
The ignition source of an appliance shall be elevated not less than _____ unless it is lisred as flammable ignition resistant
a) 6 feet
b) 18 inches
c) 4 feet
d) 24 inches
144.
A single wall oil heat chimney connector shall have ______ clearance from combustibles
a) 9
b) 18
c) 36
d) 12
145.
When bending metallic gas pipe, the inside radius shall not be less than _____ times the diameter
a) 6
b) 10
c) 5
d) 25
146.
A label shall be affixed to the gas appliance with all the following information except _______
a) BTUH rating
b) type of fuel used
c) manufacture date
d) minimum clearances
147.
A HOUSE HAS A HEATING LOAD OF 48,000 BTUH. HOW MANY CFM ARE REQUIRED FOR A ROOM WITH A HEAT LOAD OF 5200 BTUH, USING A FURNACE WITH A 1200 CFM BLOWER?
a) 468
b) 112
c) 130
d) 1112
148.
Cleanouts located on horizontal grease ducts shall be placed not more than ____feet apart
a) 100
b) 15
c) 20
d) 10
149.
A BLOWER WITH AN EXTERNAL STATIC PRESSURE OF .55" WC IS CONNECTED TO A 70 FT. LONG DUCT. THE SYSTEM INCLUDES REGISTERS AND GRILLS (.03" WC EACH), A COOLING COIL (.15" WC) AND FILTER (.10" WC). WHAT IS THE TOTAL AVAILABLE STATIC PRESSURE REMAINING FOR SIZING THE DUCT?
a) .15" WC
b) .17" WC
c) .30" WC
d) .24" WC
150.
Shield plates on studs must be a minimum ____ - inch thick
a) .087
b) .025
c) .075
d) .062
151.
Semi-ridgid metallic tubing used as appliance connectors shall not exceed ___ feet
a) 8
b) 3
c) 6
d) 5
152.
Corridors are generaly not permitted to be used as return ducts, however the hallway of a tenant space ______ square feet or less may be used for return air.
a) 1200
b) 500
c) 750
d) 1000
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