Practice HVAC exam


1. The minimum cross-sectional dimension nof a combustion air duct shall be ________ inches




2. THE LARGEST A BORED HOLE MAY BE IN A 2' x 9.5" joist is




3. Semi-ridgid metalic tubing used as appliance connectors shall not exceed ___ feet




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




5. Plastic pipe shall not be ooperated at pressures greater than ______ psig for LP gas




6. 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.




7. Grease ducts shall provide an air velocity not less than _______ feet per minute




8. Gas piping may be joined in concealed locations using which of the following methods?




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




10. AN APPLIANCE RATED AT 75,000 BTUH INPUT MUST BE PLACED IN A ROOM CONTAINING A MINIMUM ______ CUBIC FEET IN ORDER TO BE IN AN UNCONFINED SPACE.




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




12. A NON LOAD BEARING STUD MAY BE NOTCHED ______% OF ITS DEPTH.




13. A JOINT OBTAINED BY THE JOINING OF METAL PARTS WITH METALLIC MIXTURES OF ALLOYS WHICH MELT AT 1050 DEGREES F, IS CALLED A __________ JOINT.




14. 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?




15. 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?




16. A HEATPUMP IN A RESIDENCE MUST BE CONTROLLED BY WHICH OF THE FOLLOWING?




17. 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




18. A DOUBLED UP STUD IN A LOAD BEARING WALL MAY HAVE A HOLE BORED UP TO ______% OF IT DEPTH




19. 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




20. A CONTRACTOR PAYS $750 FOR A FURNACE PLUS 7% TAX. WHAT WOULD HIS SALES PRICE BE IF HE WISHED TO MAKE 30% GROSS PROFIT?




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




22. 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?




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




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




25. 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?




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




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