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Practice hvac licensing test. This quiz is based on the International Mechanical and Fuel Gas Codes, ACCA's Manual j and D and NASCLA's Contractor Business book.Click on the [i] just in front of each question for answer explanation
1.
Table 305.4 IMC
1/2" copper tubing must be supported a minimum of _______ feet when installed horizontally
a) 4
b) 10
c) 8
d) 6
2.
NASCLA business book or look up ADA
THE AMERICANS WITH DISABILITIES ACT APPLIES TO ALL EMPLOYERS WHO HAVE _______ OR MORE EMPLOYEES
a) 25
b) 15
c) 50
d) 10
3.
section 406 (5 x test pressure)
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
4.
section N1103.3.6 energy code
1500 sq. ft. / 100 = 15
15 x 4 =60 cfm
NOTE: the 2009 and earlier codes state 6 cfm/1000 sq.ft.
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
5.
section 909 IMC
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
6.
section 402.7 IFGC
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
7.
section 506 Grease duct enclosure
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
8.
section 709 ( 6 x10 = 60 sq. in., 60/.75 = 80 sq. in.)
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
9.
503.10.9._ gas code
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
10.
404 Limitations. IFGC
Plastic pipe shall not be operated at pressures greater than ______ psig for LP gas
a) 100
b) 15
c) 30
d) 10
11.
Table 404 IMC
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
12.
Section 506 IMC
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
13.
still air surface = .68
gypsum = .45
air space = .91
gypsum = .45
still air surface = .68
Total R = 3.17
U = 1/3.17 = .315
wall is 240 square feet (30 x 8)
BTUH = area x U x td
240 x .315 x 20 = 1512 (close enough)
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
14.
302 mech code
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"
15.
Tablle 403.3 IMC (1500/1000 = 1.5, 1.5 x 50 people = 75 people, 75 x 5 cfm/person = 1500 cfm)
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
16.
$75,000/.15 = $500,000
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
17.
section 506 IMC
A commercial stainless steel duct must be constructed of ______ gage thickness
a) 20
b) 14
c) 18
d) 16
18.
404.9.1 gas code
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
19.
section 306 IMC
Passageways in attics shall not be less than _____ inches wide
a) 24
b) 20
c) 30
d) 22
20.
304.5.1 GAS CODE
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
21.
section 504 IMC
Close dryers exhausting more than ____ cfm must be provided with make up air
a) 150
b) 100
c) 200
d) 75
22.
table 406.7.1 gas code
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
23.
use friction chart or duculator
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
24.
Only R values can be added or subtracted, therefore, convert the U value to R value (1/.07 = 14.28).
add R 19 + R 14.28 = R 33.28
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
25.
ACCA Manual D
Room cfm = HF X room heat lose
HF factor = 1200/48,000
HF= .025
Therefore: .025 x 5200 = 130 cfm
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
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PURCHASE 150 QUESTION PRACTICE TEST