1 Exam Prep. Air Conditioning "A", "B" and Mechanical Practice Exam 13 Drawings Attached

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1 1 Exam Prep Air Conditioning "A", "B" and Mechanical Practice Exam 13 Drawings Attached 1 A concentric reducer will cause? A Pressure to increase B Flow to increase C Pressure to remain constant D Flow to remain constant 2 An electrical instrument that measures electrical resistance, the opposition to an electric current in small quantities is a/an? A Ammeter B Voltmeter C Ohmmeter D Periodontal meter 3 If there is a shortage of refrigerant, the liquid level in the receiver will? A Cause the cooling coils to be colder than normal B Drop below the inlet of the liquid pipe C Cause the suction pressure to be higher than normal D Cause bubbles to appear if there is an overcharge of refrigerant 4 A good non-conducting substance is? A Metabolic B Dialectic C Dielectric D Anode 5 The 60 X 18 inch rectangular duct is paired at 5 foot spacing. The minimum size of the strap hangers is? A 1 inch by 22 gage B 1 inch by 20 gage C 1 inch by 18 gage D 1 inch by 16 gage 1

2 6 The duct is 24 inches wide by 24 inches high. When using 3 inch wide channel, the hangers should be spaced no farther apart than? A 6 inches B 8 inches C 6 feet D 4 feet 7 The 12 inch round duct requires a inch rod. A 1/4 B 3/8 C 1/2 D 5/8 8 The type lock used for straight duct and fittings is the? A Pittsburgh lock B Button punch snap lock C L-4 Standing seam D Flat lock 9 All seams for grease ducts shall be? A Liquidtight continuous internal weld B Liquidtight continuous external weld C Double spot welded D Taped and mechanically fastened 10 A flange used to seal off the end of a pipe is a/an? A Cap flange B Blind flange C Block flange D Braze flange 11 One of the biggest dangers to a cascade system is? A Low voltage B Condensable gases C Non-condensable gases D Compressor overload 2

3 12 Hand-held instruments should not be used in excess of how many volts? A 399 B 499 C 599 D The excavation is 10 feet by 10 feet by 15 feet deep. The excavation was made in Type "C" soil. The measurements at the top of the excavation are? A 15 feet by 15 feet B 25 feet by 25 feet C 32.5 feet by 32.5 feet D 55 feet by 55 feet 14 Dangerous piping should be identified with? A Red with white lettering B Yellow marking with red lettering C Orange with black lettering D Bright blue with white lettering 15 Because of very short piping and little resistance to spray water flow, the for an evaporative condenser is considerably lower than that of a cooling tower system of equal capacity. A Brake differential B Enthalpy C Pump horsepower D Blowdown 16 The travel is feet. There will be a 45 degree angle. The offset distance is? A 8 feet B 4.68 feet C 9.24 feet D 3.31 feet 17 Where ductwork is large enough to allow entry of personnel, not less than one approved opening having dimensions not less than inches shall be provided in the horizontal section. A 18 X 18 B 22 X20 C 24 X 24 D 24 X28 3

4 18 The L-4 Standing Seam lock should be fastened at intervals not to exceed how many inches? A2 B 4 C6 D 8 19 According to Fibrous Glass Duct Construction Standards, closure tape should be centered over edge of stapling flap inches minimum overlap. A 1 B 2 C4 D 8 20 There are how many grades of commonly used manila rope? A2 B 3 C5 D 6 21 When checking the low-pressure control, the proper sequence should be to? A Leave the compressor running, crack the service valve off the front seat, front-seat the suction service valve and observe the pressure on the compound gage. B Stop the compressor, crack the service valve off the back seat, front-seat the suction service valve and observe the pressure on the compound gage. C Stop the compressor, crack the service valve off the back seat, front-seat the suction service valve and observe the pressure on the compound gage. D Leave the compressor running, crack the service valve off the back seat, front seat the suction service valve and observe the pressure on the compound gage. 22 On systems where the low side pressure is below 0 psig, use which of the following? A Front-seat the valves on the gauge manifold, back-seat the system service valves to isolate the gauge ports from the rest of the system, make the hose connections to the system, loosen the hose connection to the discharge service valve B Front-seat the valves on the gauge manifold, front-seat the system service valves to isolate the gauge ports from the rest of the system, make the hose connections to the system, tighten the hose connection to the discharge service valve C Back-seat the valves on the gauge manifold, front-seat the system service valves to isolate the gauge ports from the rest of the system, make the hose connections to the system, tighten the hose connection to the discharge service valve D Front-seat the valves on the gauge manifold, back-seat the system service valves to isolate the gauge ports from the rest of the system, make the hose connections to the system, tighten the hose connection to the discharge service valve 4

5 23 Flame detector fumes are likely to be which deadly gas? A Carbon dioxide B Carbon monoxide C Water vapor D Phosgene 24 According to the Trane Manual, R-12 at 80 degrees Fahrenheit will exert a gauge pressure of? A 98.8 B C D Steam piping shall be installed to drain to the? A Boiler B Pitch pocket C Drip pan D Sediment pan 26 A device used for measuring current flow at any point in an electrical circuit is a/an? A Ammeter B Voltmeter C Ohm meter D Peking meter 27 Which of the following operates a lift station? A Flow meter B Float valve C Manual activation D A man in the hole 28 Do not work on electrical circuits until they are? A Opened and tagged B Tagged and locked C Opened and locked D Tagged, opened and locked 29 A method commonly used to check fuses is to? A Leave the voltage off and check for line voltage across the phases B Leave the voltage on and use an ohmmeter to check for continuity through it C Remove the fuse from the fuse box on and use an ohmmeter to check for continuity through it D Remove the fuse from the fuse box and replace with a known working fuse 5

6 30 Compressor bearings that have not received proper lubrication will become? A Worn B Crystallized C Loose D Tight 31 Rectangular ducts with flexible liners with an interior width of 6 inches? A Require mechanical fasteners in addition to adhesive B Do not Require mechanical fasteners in addition to adhesive C Shall be coated with adhesive when velocities are over 2,000 FPM D Shall have metal nosings used on the downstream edges of the liner 32 When an unstable gas supply is experienced, the contractor should? A Evacuate the area immediately B Install another regulator C Install a two stage regulator D Increase the gas pressure 5 degrees 33 Hydronic piping systems shall be tested at not less than psi. A 100 B 150 C 200 D Where a damper is installed within a duct, a smoke detector shall be installed within? A 18 inches B 2 feet C 3 feet D 5 feet 35 The following wiring information is available: 1 to 3 is 8 ohms, 1 to 2 is 3 ohms and 2 to 3 is 6 ohms. Line three is which terminal? A Start B Run C Common D Overload 6

7 36 Oil pressure failure controls operate using how many pressure sensitive lines? A 1 B 2 C3 D4 37 Compressor bearings that are worn become? A Weak B Tight C Noisy D Jammed 38 The gage reading for R-12 at 40 degrees Fahrenheit is? A 51.6 B 36.9 C 49.8 B When using cranes, do all of the following except? A Check for the center of gravity B Check for specific hoisting instructions C Check component and assembly weights D Use eyebolt holes to hoist the assembly 40 High duct pressure systems designed to operate at or greater than inches water gage shall be tested in accordance with the SMACNA. A 1 B 2 C3 D4 41 The thermal expansion valve is actuated by the and the of the refrigerant vapor leaving the evaporator. A Pressure and velocity B Temperature and velocity C Suction and compression D Pressure and temperature 7

8 42 Waste water piping is identified by the color? A Purple B Blue C Red D Green 43 Which of the following is suitable for use with hydrochloric acid piping? A Cast iron B Aluminum C Stainless steel D Type 2 PVC 44 Storage space requires a tank be 10 feet in diameter and contain at least 8,225 gallons. The minimum length of the tank will be? A 3 1/2 feet B 7 feet C 14 feet D 28 feet 45 One square foot of surface area requires 3.5 board feet for an area 5 feet by 8 feet. The board feet required for an area 30 feet by 6 feet is? A Less than 650 B Between 651 to 1,260 C Between 1,261 to 1,860 D More than 1, According to Code, tapes shall be applied such that they extend not less than how many inches onto each of the mated surfaces? A 1 B 2 C3 D 8 47 Exhaust outlets shall terminate above the roof at least how many inches? A18 B 24 C 40 D 60 8

9 48 The cost of fuel gas given 80 percent efficiency and a usage of 280 gallons at a cost of $1.05 per gallon is? A $ B $ C $ D $ Hoods with dampers in the exhaust require an access panel to be located within of the damper. A 18 inches B 2 feet C 3 feet D 5 feet 50 The total weight of one foot of 1 1/2 inch Type "L" copper pipe filled with water is? A 1.14 pounds B.7731 pounds C pounds D pounds 51 Triple evacuation of the system should lower the system pressure to microns or lower. A 500 B 1,000 C 1,500 D 2, A type of evaporator used to provide chilled water for air conditioning systems is the? A Chin chiller B Heat dispersing pump C Latent evaporator D Shell-and-tube 53 The dining room seats 200 people. The required CFM's of outdoor air? A 200 B 400 C 1,000 D 1,500 9

10 54 A fan is to deliver 6,000 cfm against a.5 fan static pressure. The static efficiency of the fan is 80 percent. The brake horsepower required is? A.589 B 1.51 C 2.40 D Given the following readings,.067,.041,.079,.050,.060,.063, the average is? A.060 B.041 C.063 D Motor overheating is usually caused by? A Low resistance B Low current draw C Excessive current draw D Bad windings 57 The most common type of flow control device used on units of 5-ton capacity and above is the? A Thermostatic expansion valve B Swing check valve C Automatic expansion valve D Liquid line shut-off valve 58 The contractor is installing a 14 inch volume damper. The contractor should use? A Single blades B Multiple blades C Stainless steel D Dual hemming 59 The total cubic feet per minute delivery for the ABC Construction School Air Distribution System is? A Less than 3,800 B Between 3,800 and 4,000 C Between 4,000 and 4,200 D More than 4,200 10

11 60 The Cooking Exhaust Rooftop Mount depicted in the drawing must be a minimum of how many inches from the roof deck? A 18 B 36 C 40 D The minimum clearance to combustibles for the Type 1 Hood is? Al2 inches B 18 inches C 24 inches D 36 inches **QUESTIONS 62, 63, 64, 65, 66, 67, 68, 69 and 70 ARE FOR MECHANICAL CANDIDATES ONLY** 62 Storage rooms for medical gases when made of construction materials shall have a fire rating of at least how many hours? A 1 B 2 C3 D4 63 Where Category 1 vacuum exhausts from multiple pumps are used, which of the following should not be used? A Manual valves B Check valves C Blind flanges D Flow meters 64 Category 3 vacuum piping shall not be tested with compressed gas when made of? A PVC B Copper C Steel D Metal 65 Compressor intakes shall be located at least how many feet above the ground? A5 B 10 C15 D 20 11

12 66 Openings for future use in medical gas rails shall be capped or plugged requiring the use of? A Pliers B A screwdriver C Special tool D A torch 67 Where underground piping is installed through a wall, the ends of the sleeve shall be? A Tapered B Sealed C Crimped D Locked 68 A 6 inch gas pipe prior to operation requires purging when in excess of feet. A 50 B 30 C15 D The interval of support for 1 inch steel piping shall not exceed feet. A6 B 8 C10 D Metallic piping exposed to corrosive action such as moisture shall be? A Galvanized B Zinc coated C Used indoors D Protected in an approved manner

13 25" x 8" 8" \ 1 0" 8" \ VP / 390 CFM 420 CFM 390 CFM 30" x 20" SEE DETAIL; 20" x 8" 'S/ 14" x 8" \-,/ 8" x 8" \ 40" x 8" r N. \ r \ 320 CFM 310 CFM 290 CFM DETAI 30" x 20" RETURN AIR GRILLES 48" x 24" 40" x 8" 20"x8"\ / 14" x 8" \../ 8" x 8" 25" x 8" I\ / 0/. 320 CFM 310 CFM / 10" x 8" \ 290 CFM 390 CFM 420 CFM 390 CFM MN Exhaust fan ROOF Minimum roof clearance is? \ Hot roof deck 4 Minimum clearance to combustibles is? Cooking exhaust rooftop mount TYPE 1 HOOD 13

14 ANSWER KEY EXAM 13 1 A Trade knowledge 2 C Air Conditioning/Refrigeration Troubleshooting Handbook 2/3 3 B Trane Air Conditioning Manual C Trade knowledge 5 B SMACNA Duct Construction Standards, Metal/Flexible C SMACNA Fibrous Glass Duct Construction Standards Figure A SMACNA Duct Construction Standards, Metal/Flexible A SMACNA Duct Construction Standards, Metal/Flexible B NFPA B Pipefitter's Handbook C Air Conditioning/Refrigeration Troubleshooting Handbook C Air Conditioning/Refrigeration Troubleshooting Handbook D Contractors Manual X 1.5 X = C Pipefitter's Handbook C Trane Reciprocating Refrigeration A Pipefitter's Handbook B Florida Building Code, Mechanical, D SMACNA Duct Construction Standards, Metal/Flexible A SMACNA Fibrous Glass Duct Construction Standards Figure D Contractors Manual D Air Conditioning/Refrigeration Troubleshooting Handbook D Air Conditioning/Refrigeration Troubleshooting Handbook D Air Conditioning/Refrigeration Troubleshooting Handbook C Trane Air Conditioning Manual A Florida Building Code, Mechanical, A Trade knowledge 27 B Trade knowledge 28 D Air Conditioning/Refrigeration Troubleshooting Handbook C Air Conditioning/Refrigeration Troubleshooting Handbook

15 30 D Air Conditioning/Refrigeration Troubleshooting Handbook B SMACNA Duct Construction Standards, Metal/Flexible C Air Conditioning/Refrigeration Troubleshooting Handbook A Florida Building Code, Mechanical, D Florida Building Code, Mechanical, A Air Conditioning/Refrigeration Troubleshooting Handbook 7 36 B Trane Reciprocating Refrigeration C Air Conditioning/Refrigeration Troubleshooting Handbook B Trane Reciprocating Refrigeration 3 39 D Air Conditioning/Refrigeration Troubleshooting Handbook 429/ D Florida Building Code, Mechanical, 2010 Table D Trane Air Conditioning Manual D Pipefitter's Handbook D Pipefitter's Handbook 3-41/42 44 C Pipefitter's Handbook A Trade knowledge 30 X 6 X 3.5 = A Florida Building Code, Mechanical, C Florida Building Code, Mechanical, B Trade knowledge 49 A NFPA C Pipefitter's Handbook 5-11/14 51 B Air Conditioning/Refrigeration Troubleshooting Handbook D Trane Air Conditioning Manual D Florida Building Code, Mechanical, 2010 Table X 7.5 = 1, A Trane Air Conditioning Manual A Trade knowledge 56 C Air Conditioning/Refrigeration Troubleshooting Handbook A Air Conditioning/Refrigeration Troubleshooting Handbook B SMACNA Duct Construction Standards, Metal/Flexible

16 59 D 420 X 2 M+ 390 X 4 M+ 320 X2 M+ 310 X 2 M+ 290 X 2 M+ MR = 4, C NFPA (8)(b) 61 B Florida Building Code, Mechanical, A NFPA 99 - Health Care Facilities (4) 63 D NFPA 99 - Health Care Facilities (2) 64 A NFPA 99 - Health Care Facilities D NFPA 99 - Health Care Facilities C NFPA 99 - Health Care Facilities B NFPA 99 - Health Care Facilities * 68 D Florida Building Code, Fuel Gas, 2010 Table B Florida Building Code, Fuel Gas, 2010 Table D Florida Building Code, Fuel Gas,

B. Base occupied space sound level estimates on ARI 885. C. Terminal heating coils shall conform to ARI 410.

B. Base occupied space sound level estimates on ARI 885. C. Terminal heating coils shall conform to ARI 410. PART 1 - GENERAL 1.01 Purpose: A. This standard is intended to provide useful information to the Professional Service Provider (PSP) to establish a basis of design. The responsibility of the engineer is