1 Exam Prep Air Conditioning A, B and Mechanical Practice Exam...

1 Exam Prep

Air Conditioning "A", "B" and Mechanical Practice Exam 16

1 Solar systems shall be controlled so that the temperature in the supply system shall not exceed?

A 250 degrees Centigrade B 250 degrees Fahrenheit C 212 degrees Fahrenheit D 121 degrees Fahrenheit

2 The Pittsburgh lock is good to water gage.

A Plus 10 B Minus 10 C Plus or minus 8 D Plus or minus 10

3 Ducts with interior widths of inches or less do not require mechanical fasteners in addition to adhesives.

A6 B 8 C10 D 12

4 Refrigerants shall be classified according to?

A ARI 700 B ASHLRAE 34 C UL 1995 D Table 1103.1

5 According to the Florida Building Code, Plumbing, exhaust outlets that terminate above the roof, shall have the discharge opening located not less than inches above the roof surface.

A18 B 36 C 40 D 48

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6 A 28 inch 20 gage round spiral seam duct 100 feet long weighs pounds.

A 12.9 B 129 C 1,290 D 680

7 When needing to install a 15 ton unit using R-22, at 100 feet developed length with a 3 psi drop from the receiver to the evaporator, the size Type "U copper line to use with a suction of 40F and 105 F condensing is inches.

A 7/8 B 1 C 1 1/8 D 13/8

8 Replacement air shall always be adequate to prevent pressures in commercial cooking.

A Negative B Positive C Neutral D Active

9 Dew point is?

A Condensation droplets occurring on the inside of the unit B Wet bulb as a reverse of dry bulb C The temperature at which moisture will start to condense from the air D Evaporation of the water droplets

10 The thermostat should be replaced when a calibration of more than degrees Fahrenheit is needed.

A10 B 5 C3 D 2

1 1 The hardness of the makeup water is 6. The hardness of the sump water is 10. Evaporation is .3 gallons per minute. The blowdown is?

A .3 B .12 C .2 D .45

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12 The oil in the sight level glass should be at?

A Or slightly above the center of the sight glass B Or slightly below the center of the sight glass C The center of the sight glass D The upper top section of the sight glass

13 A large deterrent to using the earth as a heat sink is?

A Environmental concern B Cost C Location D Productivity

14 The proper wire connection for the reversing valve in a heat pump thermostat is the?

AB B G C 0 DX

15 When experiencing an unstable gas supply the contractor should use a?

A Larger regulator B Two stage regulator C Smaller regulator D High compression regulator

16 A clockwise top angular down blast discharge is identified as?

A CWTADD B CCWTAUD C CCWTADD D CWTADD

17 Archimedes Inc. sold a rope with a 4,000 pound capacity to AAA. The rope factor was 4:1. The maximum safe load AAA may lift with the rope is?

A 2 tons B 16 tons C 2,000 pounds D 1,000 pounds

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18 An improperly located feeler bulb will result in a?

A High suction pressure B Low suction pressure C Broken fan belt D Icing situation

19 A proportional controller produces a?

A Modulated signal B Calibrated signal C Pneumatic action D Piston drive

20 For accurate readings, whirling of the psychrometer should continue until?

A The wick is dry B The clicking sounds stops C All readings are confirmed D Two sets of successive readings agree

21 Heat pump defrost controls are used to detect on the outdoor coil during the heating cycle.

A Ice and frost B Heat C Air flow D THX operation

22 All pneumatic nailers shall have a safety device on the muzzle when operated at psi or greater.

A 30 B 80 C 100 D 120

23 The TWA for R 134a is?

A 1,000 B 2,500 C 300 D 50

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24 Which gas when combined with oil will cause an explosion?

A Nitrogen B Argon C Xenon D Oxygen

25 A central warm air system through which air is circulated by gravity is a/an system.

A Forced air B Gravity C Flow-through D Metered

26 Safety nets are required when no other means of catch platforms are used and the height is more than feet above the ground or water surface.

A6 B10 C 25 D 32

27 Sheet metal sleeves used inside ductboard for heater applications shall extend how many inches beyond each side of the heater?

Al2 B 6 C4 D 18

28 When the humidity is percent or higher there is a greater opportunity for mold growth.

A 25 45

C 60 D 80

29 When acting as a signaler, which of the following is not allowed?

A Swing the load over materials B Being aware of overhead lines C Placing a signaler on each side of the crane D Warning people to stay away

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30 Amperage relays must be for satisfactory operation.

A Properly mounted B Electromagnetic C High voltage D Low voltage

31 Hearing protection is required where sound levels are greater than how many decibels?

A 80 B 90 C 100 D 105

32 Many large compressors are provided with controls to provide capacity.

A Controlled B Variable C Constant D Unlimited

33 The most probable cause for the suction line to be frosted or sweating in refrigeration is?

A The expansion valve is stuck open B An overcharge of refrigerant C The evaporator is overloaded D The cooling water is shutoff

34 Auxiliary drain pans shall not be less than inches larger than the unit.

A 1.5 B 3 C6 D 12

35 An 18 inch diameter connector requires a minimum nominal galvanized thickness of?

A 16 gage B .043 C 24 gage D 26 gage

36 During the winter months a desired relative humidity should be between percent.

A 30 and 50 B 40 and 60 C 50 and 70 D 60 and 80

37 The auxiliary drain pan shall have a minimum depth of inches.

A 1.5 B 3 C6 D 8

38 For exposed rectangular ducts over 14 inches the minimum galvanized sheet metal thickness is?

A 26 gage B .019 inches C .024 inches D .013 inches

39 The difference between actual cold water temperature and existing wet bulb temperature is termed?

A Approach B Range C Dew point D Condensation

40 Public toilet rooms require a minimum air flow of?

A 50 sfm's per unit B 100 sfm's C 50 cfm's per unit D 100 cfm's

QUESTION 41 IS FOR MECHANICAL. CONTRACTORS ONLY

41 The minimum square feet of opening required for a unit consuming L000,000 BTU's and using all air from outdoors is square feet.

A 250 B 1.73 C 3.47 D 6.94

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42 The amount of friction loss within a pipe is dependent upon?

A The condition of the pipe and the velocity of the water B The type of pipe and the velocity of the water C The size of the pump and the distance of the flow D Rate of flow and the condition of the pump

43 The most probable cause for high head pressure in a heat pump is?

A An overcharge of refrigerant B High air temperature C Defective reversing valve D Shortage of refrigerant

44 A plugged capillary tube is caused by?

A Excessive airflow B Trapped foreign particles C Untrappped foreign particles D Low head pressure

45 An 18 inch by 18 inch rectangular elbow should have a centerline radius of inches.

A18 B 27 C 36 D 45

46 Inspection windows shall be permitted in air ducts provided they are?

A Glazed B Tempered C Wired glass D Glazed with wire glass

47 Liquid adhesive coating used on air filters shall have a minimum flash point of degrees Fahrenheit.

A 212 B 250 C 300 D 325

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48 The ten-inch impeller is delivering 550 gallons per minute. Billy needs to deliver 685 gallons per minute. Billy should upgrade to a inch impeller.

A 11 12

C13 D 14

49 The excavation is to be 960 feet long. There will be 1 cubic yard per lineal foot. The contractor is able to excavate 6 cubic yards per hour. The total number of 8-hour days to complete the excavation is?

A Less than 40 B Between 40 and 80 C Between 80 and 160 D More than 160

50 Which should not be used to pressurize a system?

A Air B Nitrogen C Argon D Oxygen

51 According to Trane Reciprocating Refrigeration, which of the following should never be used as a test gas?

A Dry nitrogen B Oxygen C Krypton D Argon

52 Jesse is using a braided sling with a hook. The maximum percent from plane twist allowed from the throat is?

A 10 15

C 20 D 25

53 The type vent required for oil burning appliances is?

A Type A B Type BW C Pellet D Type L

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54 The fan belt should be flexible for not more than?

A 1/2 inch B 3/4 inch C 1 inch D 2 inches

55 Suspended equipment must have a minimum clearance from grade of?

A 6 inches B 1 foot C 18 inches D 2 feet

56 Each scaffold must be capable of supporting at least how many times its own weight?

A4 B 3 C2 D 1

57 Fusible links shall have a temperature rating of approximately degrees Fahrenheit.

A 250 B 200 C 150 D 50

58 A Class "E" round duct angle ring has a size of?

A1.5 X1.5 X.25 B 2 X2 X.1875 C2 X2 X.25 D 1 X1 X1

59 The looping of hot gas from the compressor is usually done by a degree loop.

A 45 B 90 C 180 D 360

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60 Within a dwelling unit, appliances installed in a compartment space shall be accessed by an opening or door and an unobstructed passageway of not less than inches.

A 24 B 30 C 32 D 36

61 Reinforcement for flat sides of oval duct shall be provided to limit wall deflection to inches.

A 1/2 B 3/4 C .25 D 3/16

62 Using R-22 with 25 tons and a 1 5/8 inch line, the gas velocity in feet per minute is?

A 4,000 B 6,000 C 1,000 D 2,000

63 Pitot tubes when used with manometers cannot be used to accurately measure air velocities of less than how many feet per minute?

A 700 B 1,000 C 1,200 D 1,500

64 The minimum clearance for a Type 1 hood to combustibles is inches.

A6 B 12 C18 D 24

65 Starting capacitors found to be out of the range of percent of the mfd rating of the capacitor must be replaced.

A Oto+ 20 B 5 to + 20 C5 to+ 25 D 10 to+ 30

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66 Clearance from the duct to the interior surface of a limited-combustible shall be not less than how many inches?

A6 B8 C12 D 18

67 A device use to measure watts is the?

A Ammeter B Resistor C Conductor D Capacitor

68 Which is not a common cause of high discharge pressure?

A Compressor discharge service valve is front-seated B Excessive cooling air C Lack of cooling water D Non-condensable gases

69 Refrigerant 134A boils at?

A -41.1 F B -14.92F C -28 F D 82.11F

70 The equivalent length in feet is 50. R-22 is being used from the evaporator to the compressor. The suction is 35 degrees Fahrenheit and 115 degrees Fahrenheit condensing. The pressure drop is 2.0 psi. The minimum tonnage using a 7/8 inch Type "L" copper line is?

A 3.4 B 3.8 C 3.52 D 38.08

71 The terminal that is the most likely to short is the one with the?

A Red dot B Double clip C Plus sign D Minus sign

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72 The latent heat generated by an adult male doing moderate dancing is BTU's.

A 900 B 850 C 305 D 545

73 When pressurizing a system with nitrogen, the technician should use a/an?

A Two stage regulator B Gauge-equipped regulator C Air pack D Strip and peel swab

74 Where equipment requiring access is installed on a roof at a height exceeding feet, such access shall be provided by a permanent means of access.

A6 B 10 C16 D 20

75 When using a psychrometer, the lowest reading is the?

A Wet bulb B Dry bulb C Correct reading D Useable reading

76 Once the compressor is fully unloaded, any further system load reduction causes the?

A System to overheat and shut down B Compressor suction pressure and temperature to fall accordingly C THX valve to automatically close and open D Oil pressure to decrease and the system to chug

77 Phos-copper filler metals should not be used on ferrous metals containing more than percent nickel.

A10 15

C 20 D 25

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78 If tubing is flattened there may be condensation or frost on the side of the kink.

A Inlet B Outlet C Front D Back

79 When a flux becomes saturated with oxides its?

A Viscosity increases B Viscosity decreases C Viscosity remains constant D Saturation index is nullified

80 The amount of makeup air shall always be equal to?

A The amount of air required for the cooking operation B The amount of air required for the cooking operation plus 5 percent C The amount of air so as to not require a negative air flow D The amount of exhaust air to prevent a negative air flow

81 A 1/4 inch single hanger rod for rectangular duct should have a maximum allowable load of how many pounds?

A 80 B 120 C 160 D 270

82 Rooms containing appliances requiring access shall be provided with a door and an unobstructed passageway measuring not less than inches wide.

A 24 B 30 C 32 D 36

83 Running capacitors that are found to be out of range percent of the mfd rating must be replaced.

A Plus or minus 5 B Plus or minus 10 C Plus or minus 15 D Plus or minus 20

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84 Given .075 friction and an air volume of 4,000 cfm's, the opposite side of a 30 inch rectangular duct would be inches?

A 15 B 16 C17 D 18

85 The suction line is from the?

A Evaporator to the compressor B Condenser to the evaporator C Compressor to the condenser D Compressor to the evaporator

86 An open winding is indicated by a resistance reading on the ohmmeter of?

A Low B High C Infinity D Normal

87 Fans shall discharge a minimum of how many inches away from any roof surface?

A18 B 36 C 40 D 42

88 The number of mitered pieces required for a mitered elbow when the velocity is less than 1,000 feet per minute is?

A 1 B 2 C3 D4

89 Each extra-heavy-duty type lA plastic ladder shall sustain at least times the maximum intended load.

A 2.5 B 3.3 C4 D 5

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90 All screws penetrating ductboard shall be no more than inches longer than the ductboard.

A2 B 1 C.5 D .25

91 The fire damper rating required for a 2 hour fire-resistance-rated assembly is hours.

A 1 B 1.5 C2 D 3

92 All deep-fat fryers shall be installed with at least a inch space between the fryer and surface flames.

A6 B 12 C16 D 18

93 When torch brazing, the contractor should use a lens shade of?

A 14 B 11 C5 D4

94 According to the Florida Mechanical Code, the only time oxygen is allowed to be used as a test gas is?

A In the event of a medical evacuation B As directed in the NFPA C Never D When diluted with oil free dry nitrogen

95 The service technician notices the gage pressure for Refrigerant 22 is 243 degrees. The temperature should be how many degrees Fahrenheit?

A 114 B 115 C 116 D 117

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96 Water has a specific heat of?

Al B .5 C .25 D .940

97 Do not allow liquid refrigerant to come into contact with the?

A Hoses B Skin or eyes C Regulators D Gauges

98 To stabilize the suction pressure and temperature throughout, compressors used in large systems are generally equipped with cylinder?

A Sequence monitoring B Unloading control C Timing mechanisms D Withdrawal blocks

99 When replacing a heating relay, the service technician should always use?

A Capillary tongs B An ohmmeter C An exact replacement D A replacement either the same or of higher value

100 On scaffolds where platforms are overlapped to form a long platform, the overlap shall be not less than inches.

A 24 B 18 C12 D 6

101 A burned-out defrost valve solenoid coil will prevent operation of the?

A Defrost circuit B THX valve C Solenoid coil D Hot gas bypass line

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102 One of the nice things about a trap is?

A The filter effect on the fluid B The aid in allowing the oil to start its climb up the suction and hot gas risers C The minimum horizontal dimension required for cutting down the elbows D The accumulation of oil drained from the hot gas riser

103 Chlorotrifluoromethane is designated as refrigerant?

A R13 B R12 C R 134a DR 218

104 When joining copper-to-steel the best solder to use is?

A Hard B Soft C Silver D Lead

105 Most air conditioning systems use a superheat setting of approximately degrees Fahrenheit. A 12 to 15 B 15 to 18 C 18 to 21 D 21 to 24

106 No solid fuel cooking device of any type shall be used for deep-fat frying involving more than quart(s) of liquid shortening.

Al B2 C3 D 4

107 Minimum insertion distance should be equal to the?

A Amount of the filler metal B Diameter of the outer tube C Diameter of the inner tube D Clearance of the inner and outer walls

108 The drawing below is representative of a/an?

A Volume damper B Wye junction C Smoke damper D Standard junction

109 Discharge fan Number 2 is a/an?

A CWUBD B CCWDBD C CCWTADD D CCWUBD

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ANSWER KEY — EXAM 16

1

2

3

B

D

B

NFPA 90B

SMACNA HVAC Duct Construction Standards, Metal/Flexible

SMACNA HVAC Duct Construction Standards, Metal/Flexible

6.1.8.1

2.10

1.6, S 2.6

4 B Florida Building Code, Mechanical, 2010 1103.1

5 C Florida Building Code, Mechanical, 2010 506.3.12.1

6 C SMACNA HVAC Duct Construction Standards, Metal/Flexible A.9

7 A Trane Reciprocating Refrigeration 91

8 A NFPA 96 8.3.1

9 C Trane Air Conditioning Manual 64

10 A Air Conditioning and Refrigeration Troubleshooting Handbook 25

11 D Trane Air Conditioning Manual 252

10 - 6 = 4 6 ÷ 4 X .3 = .45


13 B Trane Air Conditioning Manual 204

14 C Air Conditioning and Refrigeration Troubleshooting Handbook 183

15 B Air Conditioning and Refrigeration Troubleshooting Handbook 114

16 D SMACNA HVAC Duct Construction Standards, Metal/Flexible A.18

17 D Contractors Manual 7-53





22 C OSHA 29 CFR Part 1926 .302(b)(3)

23 A Florida Building Code, Mechanical, 2010 Table 1103.1

24 D Air Conditioning and Refrigeration Troubleshooting Handbook 430

25 B NFPA 90B 5

26 C OSHA 29 CFR Part 1926 .105

27 B SMACNA Fibrous Glass Duct Construction Standards 6.7

28 C SMACNA Energy Systems Analysis and Management 9.2

29 C Contractors Manual 7-91

20





34 B Florida Building Code, Mechanical, 2010 307.2.3

35 A Florida Building Code, Mechanical, 2010 Table 803.9(1)


37 A Florida Building Code, Mechanical, 2010 307.2.3

38 B NFPA 90B Table 4.1.1.1

39 A Trane Air Conditioning Manual 247

40 C Florida Building Code, Mechanical, 2010 Table 403.3

4 1 C Florida Building Code, Fuel Gas, 2010 304.6.1

1,000,000 + 4,000 = 250 + 144 X 2 = 3.47

4 2 A Trane Reciprocating Refrigeration 108



45 B Solar Domestic Hot Water Systems Repair/ Maintenance Manual 4.3

18 X 1.5 = 27

46 D NFPA 90A 4.3.5.4

47 D NFPA 90A 4.2.2.3

48 C SMACNA Energy Systems Analysis and Management 4.10

10 + 550 X 685 = 12.45 = 13

49 A 960+6+8=20

50 D Air Conditioning and Refrigeration Troubleshooting Handbook 432

51 B Trane Reciprocating Refrigeration 118

52 A Contractors Manual 7-87

53 D Florida Building Code, Mechanical, 2010 Table 802.2


55 A Florida Building Code, Mechanical, 2010 304.10

56 A OSHA 29 CFR Part 1926 .451(a)

57 D NFPA 90A 5.4.5.2.1

58 B SMACNA HVAC Duct Construction Standards, Metal/Flexible 3.6

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60 A Florida Building Code, Mechanical, 2010 306.2




64 C Florida Building Code, Mechanical, 2010 507.9


66 A NFPA 96 7.7.2.2.2




70 B Trane Reciprocating Refrigeration 92/93










80 D Florida Building Code, Mechanical, 2010 508.1

81 D SMACNA HVAC Duct Construction Standards, Metal/Flexible 5.7

82 D Florida Building Code, Mechanical, 2010 306.2


84 D Trane Ductulator



87 C NFPA 96 7.8.2.1(8)(b)

88 C SMACNA HVAC Duct Construction Standards, Metal/Flexible 3.1

89 B OSHA 29 CFR Part 1926 .1053(a)(1)(i)

90 C SMACNA Fibrous Glass Duct Construction Standards 3.1

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91 B Florida Building Code, Mechanical, 2010 Table 607.3.2.1

92 C NFPA 96 12.1.2.4







100 C OSHA 29 CFR Part 1926 .451(b)(7)



103 A Florida Building Code, Mechanical, 2010 Table 1103.1

104 C Trane Reciprocating Refrigeration 106


106 A NFPA 96 14.9.4.5



109 D SMACNA HVAC Duct Construction Standards, Metal/Flexible A.18

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