Practice HVAC exam

1. A LICENSEE MAY HAVE HIS LICENSE REVOKED FOR WHICH OF THE FOLLOWING:

a) MISCONDUCT
b) GROSS NEGLIGENCE
c) INCOMPETENCY
d) ALL THE ABOVE

2. IF A CONTRACTOR WORKS ON 15% PROFIT, WHAT WOULD HIS SALES HAVE TO BE TO MAKE $75,000?

a) $500,000
b) $112,000
c) $862,500
d) $600,000

3. 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) $1043
c) $975
d) $1146

4. THE MINIMUM INSULATION THICKNESS FOR REFRIGERANT LINES FOR A RESIDENCE IS ____.

a) 1/4"
b) 3/8"
c) 1/2"
d) 5/8"

5. 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 DROP = .05)?

a) 3/8"
b) 1/2"
c) 3/4"
d) 1"

6. 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) 124,000 BTUH
b) 28,800 BTUH
c) 19,200 BTUH
d) 18,000 BTUH

7. A CEILING HAS A TOTAL U-VALUE OF .07. WHAT IS THE NEW R-VALUE IF R-19 IS ADDED?

a) 30.28
b) 31.28
c) 32.28
d) 33.28

"Guide to Passing the HVAC Exam"

8. 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) 15,360 BTUH
b) 3,535 BTUH
c) 1,500 BTUH
d) 2,609 BTUH

9. A 75,000 BTUH (INPUT RATING) 80% AFUE FURNACE HAS A TEMPERATURE RISE OF 45-DEGREES. WHAT IS THE CFM?

a) 1212
b) 1667
c) 1515
d) 1175

10. 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) $325
b) $260
c) $197
d) $250

11. A HEATPUMP 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

12. 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) 9
b) 6
c) 12
d) MAY NOT HAVE CLEARANCE REDUCED

13. WHAT IS THE VELOCITY OF 1400 CFM OF AIR IN A DUCT MEASURING 12" X 30"?

a) 360 FPM
b) 467 FPM
c) 3.8 FPM
d) 560 FPM

14. CATEGORY I GAS EQUIPMENT MAY BE VENTED WITH WHICH OF THE FOLLOWING TYPES OF VENTS?

a) SINGLE WALL METAL
b) TYPE B
c) CHIMNEY WITH CLAY LINER
d) ALL THE ABOVE

15. 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) 4"
b) 5"
c) 6"
d) 7"

16. THE MAXIMUM ALLOWABLE HORIZONTAL LENGTH OF A CATEGORY I APPLIANCE VENT CONNECTOR IS _______ FEET FOR EACH INCH OF ITS DIAMETER.

a) 1/2
b) 1
c) 1-1/2
d) 2

17. THE MAXIMUM HORIZONTAL LENGTH OF A SINGLE WALL CONNECTOR IS ______% OF THE HIEGHT OF THE CHIMNEY OR VENT.

a) 50
b) 75
c) 100
d) 150

18. 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) 7" X 10"
b) 3.5" X 10"
c) 14' X 10"
d) 8.5" X 10"

19. 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) $14.00
c) $12.78
d) $11.16

20. THE MAXIMUM BTUH RATING OF AN UNVENTED GAS HEATER INSTALLED IN A 15 X 20 ROOM WITH 8 FOOT CEILINGS IS?

a) 48,000
b) 40,000
c) 24,000
d) 6,000

21. GAS APPLIANCE CONNECTORS SHALL NOT PASS THROUGH ANY OF THE FOLLOWING EXCEPT

a) WALLS
b) APPLIANCE HOUSINGS
c) FACTORY BUILT FIREPLACES
d) FLOORS

22. RECLAIMED REFRIGERANTS SHALL NOT BE REUSED IN A DIFFERENT OWNERS EQUIPMENT UNLESS TESTED AND FOUND TO MEET THE PURITY REQUIREMENTS OF

a) ASHRAE 34
b) NFPA 54
c) ASTM A53
d) ARI 700

23. AN AIR CONDITIONER HAS HIGH SUCTION AND A LOW HEAD PRESSURES. WHAT WOULD BE A LIKELY CAUSE?

a) DIRTY FILTERS
b) BAD OR WEAK COMPRESSOR VALVES
c) CLOGGED METERING DEVICE
d) DIRTY CONDENSER COIL

24. 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) 1112
b) 112
c) 133
d) 468

25. 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) .10" WC
b) .08" WC
c) .05" WC
d) .15" WC

26. 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) .24" WC
b) .17" WC
c) .30" WC
d) .15" WC

27. A 12" ROUND DUCT HAS A RECTANGULAR EQUIVALENT OF

a) 14 X 8
b) 15 X 8
c) 16 X 8
d) 17 X 8

28. THE VELOCITY OF 250 CFM OF AIR IN A FLEXIBLE, SPIRAL WIRE HELIX CORE DUCT SIZED AT .08" WC STATIC PRESSURE IS

a) 400 FPM
b) 500 FPM
c) 750 FPM
d) 900 FPM

29. FOR A BUILDING TO BE MAINTAINED AT 70 F, HOW MANY BTUH ARE REQUIRED TO OFFSET 300 CFM OF 20 F OUTDOOR VENTILATION?

a) 6,000
b) 1.400
c) 6,600
d) 16,500

30. THE AMERICANS WITH DISABILITIES ACT APPLIES TO ALL EMPLOYERS WHO HAVE _______ OR MORE EMPLOYEES

a) 10
b) 15
c) 25
d) 50

31. A 500 SQUARE FOOT CONFERENCE ROOM REQUIRES _______CFM OF OUTDOOR VENTILATION

a) 150
b) 250
c) 500
d) 750

32. HOW MANY 2" X 8" FLOOR JOISTS SPACED 16" O.C. MUST BE PANNED TO HANDLE 1400 CFM?

a) 1
b) 2
c) 3
d) 4

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