1 Exam Prep Trane Air Conditioning Manual Questions · C Absorption machine D Bedpan steamer 13....

1 Exam Prep

Trane Air Conditioning Manual Questions Part 1

1. Since water has a specific heat of 1, the Btu's required to raise the temperature of one pound of water 10 degrees is?

A 12 Btu's B 10 Btu's C 14 Btu's D 8 Btu's

2. The latent heat of water vapor at low temperatures does not vary much from the average figure of?

A. 1020 Btu per pound B 1010 Btu per pound C 1050 Btu per pound D 1030 Btu per pound

3. Ammonia used as refrigerant boils at?

A -28 F B -32 F C -20 F D -25 F

4. The capacity of compression systems and absorption systems depends upon the pressure existing in the evaporator since this determines the evaporator?

A Capacity B Superheat C Flash point D Temperature

5. The outlet velocity of a fan is obtained by dividing?

A The fan outlet area by the air volume B The air volume minus friction loss by the fan outlet area C The air volume by the fan outlet area D The air volume by the fan blade cross-section

1 Exam Prep - Trane Air Conditioning Manual 1

6. The formula used to compute the theoretical horsepower required to drive a fan is?

A hp = Q x Fan Pt 6356

B hp = Q ÷ Fan Pt 6356

C hp = Q x Fan Pt 6656

D hp=Q x Fan--Pt 6356

7. The total efficiency or the mechanical efficiency is computed by using the fan total pressure using the formula?

A Fan Total Efficiency = Q ÷ Fan Pt 6356 x bhp

B Fan Total Efficiency = Q x Fan Pt 6356 x bhp

C Fan Total Efficiency = 0 Fan x Pt 6356

D Fan Total Efficiency = Q x Fan Pt 6656 x bhp

8. The relationship between the quantity of air a fan will deliver and the pressure either static or total against which it can discharge the various air quantities is?

A The fan performance curve B Velocity output C Terminal velocity D Friction loss output

9. The average percentage drift loss for a mechanical draft-cooling tower is?

A 8 percent B 5 percent C 1 percent D 0.3 percent

10. The calculation equation of steady flow transfer of heat from a surface to air or from air to a surface is?

A q=Af(t2 tl) B q=Af (t2 - tl) C q=Aqx(t - t2) D q =A t (fl- f2)


11. The term used to describe the cooling of a liquid refrigerant, at constant pressure, to a point below the temperature at which it was condensed is?

A Flashing B Supercooling C Subcooling D Condensation

12. Because there are no pulsative parts, the ideal machine for hospitals, hotels, apartment buildings and office buildings is the?

A Two-stage steam machine B Hot Water indirect machine C Absorption machine D Bedpan steamer

13. When the refrigerant flows through the orifice into the evaporator, part of the refrigerant immediately evaporates because of the pressure differential, cooling the remaining refrigerant down to?

A 39 F B 40 F C 32 F D 38 F

14. The actual number of degrees the water temperature is reduced is known as the?

A Approach B Drift C Evaporation loss D Cooling range

15. The equation used to estimate the amount of blowdown is?

A B= H m Hs - Hm XE

B B= Hmx 2 xE Hs - Hm

C B= Hm x P 2 xH-M

D B= ExHm-Hs

16. The drift loss for mechanical draft towers will range from 0.1 percent of the total water being cooled for the better designs to as much as percent.

A 0.2 B 0.3 C 0.6 D 0.4


17. Fans that are low pressure, high capacity that are seldom applied for more than 3/4 in. pressure are known as?

A Axial Fans B Tube axial Fans C Vane axial Fans D Propeller Fans

18. For fluorinated hydrocarbons, there is a theoretical loss of refrigerating capacity of one percent for each degrees of superheat.

A 4.3 B 3.4 C 3.6 D 4.2

19. The reciprocating compressor when compared to the single orbiting scroll compressor, which uses R-22 refrigerant, has about percent fewer parts for the same tonnage compressor.

A 50 B 64 C 60 D 55

20. The primary purpose of the condenser is to?

A Supercool the refrigerant vapor B Solidify the refrigerant vapor C Liquiefy the refrigerant vapor D Dilute the refrigerant vapor

21. If the temperature of liquid refrigerant stored in a vessel is raised by the heat of the sun, the refrigerating capacity of the system will be?

A Reduced B Increased C Stays the same D Superheated

22. Make-up water is the sum of the water evaporated, loss by windage and the amount of bleedoff. The total make-up is generally about?

A Two gallons per hour per ton of refrigeration B One gallon per hour per ton of refrigeration C Four gallons per hour per ton of refrigeration D Three gallons per hour per ton of refrigeration


23. Which of the following is not true for Air-Cooled Condensers?

A Higher peak power requirement per ton than an evaporative condenser or watercooled condenser is required.

B They should be located indoors, with cooling tower outdoors. C They are usually located outdoors, but can be indoors with centrifugal fan models. D They have the lowest installation and maintenance cost.

24. The type of scale most commonly found in cooling towers is biofouling caused by microorganisms secreting a called "mucilage."

A White powder B Glue-like substance C Sticky substance D Viscous substance

25. When a pitot tube is used with an ultra-sensitive manometer for measuring low air velocities, it is possible to accurately measure velocities lower than?

A 400 fpm B 500 fpm C 700 fpm D 600 fpm

26. Where space limitations make necessary the installation of an elbow having a radius ratio of less than about 1.5, what should be installed in the elbow?

A Splitters B Diverters C Channelers D Sections

27. Any fluid, including air, will exert on the walls of the duct in which it is confined.

A Flow B Vibration C Pressure D Negative pressure

28. How much heat must be removed to cool 100 pounds of ice from 32 degrees to 10 degrees F?

A 22 BTU's B 248 BTU's C 220 BTU's D 2,200 BTU's


29. At atmospheric pressure, the quantity of heat required to convert one pound of 50 degree F water to boiling temperature is?

A 212 F B 162 BTU's C 1,132 BTU's D 1,316 BTU's

30. A masonry wall is built of 8-inch hollow concrete blocks and 4 inch face brick. The blocks are made of sand and gravel aggregate. Cement mortar 1/2 inch thick is between the blocks and face brick. Gypsum plaster (5/8 inch thick) with vermiculite aggregate as the inside finish of the wall. Assume a 15 mph wind. The U value for the wall is?

A 0.35 B 1.75 C 2.87 D 3.75

31. Three pounds of water per hour are added to the air in a conditioned room. How much latent heat must be removed in order to condensate the moisture in the air conditioning apparatus?

A 1,050 BTU's B 2,100 BTU's C 3,150 BTU's D 4,200 BTU's

32. There are three 1/4 hp motors and one 5 hp motor in a conditioned room. The fan delivering conditioned air to the room is driven by a 3 hp motor. The 1/4 hp motors operate continuously. The 5 hp motor runs 80 percent of the time. Sensible heat added by the motors in BTU's is?

A 12,000 B 25,370 C 37,200 D 48,500

33. A room has a lighting load of 4,000 watts of incandescent fixtures and six 1,000 watts (each) fluorescent fixtures. The heat gain, (Btuh), from the lights is?

A 26,400 B 30,000 C 34,000 D 38,080


34. A restaurant is 50 percent occupied. There are seats for 64 customers. Also there is a cashier and five active waitresses. The total heat gain in Btuh's is?

A 10,200 B 13,500 C 16,400 D 20,150

35. A commercial kitchen has the following electrical equipment installed: one 50 pound deep fat fryer (hooded), one 8 quart coffee urn without a hood. The total heat gain in Btuh's is?

A 11,524 B 19,500 C 26,900 D 32,000

36. The heat gain in Btuh from outside air requirements for 30 people in a conference room is? The outside temperature is 95 degrees F. and the humidity ratio is 105 grains per pound. The inside temperature is 78 degrees F. and the humidity ratio is 71.5 grains per pound.

A 25,086 B 35,175 C 46,820 D 62,715

37. Given 78 degrees F. dry bulb and 50 percent RH, the wet bulb is?

A 60 B 65 C 69 D 74

38. The sensible room heat for a building is 54,000 Btuh. The room is to be kept at 80 degrees F. dry bulb and the wet bulb at 62 F. The leaving temperature at the coil is 59 degrees F dry bulb and 55 degrees F wet bulb. The required supply of air at the coil is how may cfm's?

A 2,700 B 3,500 C 4,000 D 4,500

39. A room has a sensible heat gain of 18,000 Btu per hour and a latent heat gain of 5,000 Btu per hour. The percentage for sensible heat ratio is?

A 10 B 28 C 56 D 78


40. The refrigerating effect of 1 pound of Refrigerant-12 in Btu/lb; given a temperature in the evaporator of 38 degrees with the temperature of the liquid approaching the expansion valve at 80 degrees F is?

A 21.96 B 38.12 C 43.96 D 54.86

41. Given an air conditioning system with a refrigerating effect of 50 Btu per pound, the pounds per minute of R-12 to be circulated if the system capacity is 15 tons is?

A 50 B 55 C 60 D 65

42. A water cooled condenser rejects 260,000 Btuh total heat. Cooling water enters at 72 degrees F and leaves at 83 degrees. F. How many gallons are circulating per minute?

A 42.46 B 47.29 C 49.55 D 51.08

43. A blower moves 8,000 cfms at .75 static pressure. Motor efficiency is 63 percent. BHP is?

A 1.0 B 1.5 C 2.0 D 3.0

44. The aspect ratio of a 10" x 20" duct is?

A 0.5 B 1.0 C 1.5 D 2.0

45. A mechanic measures a velocity of 600 fpm discharging from a 30" x 6" wall grille with a free area of 90 percent. The actual cfm's leaving the grille is?

A 600 B 675 C 800 D 815


46. A vessel in which refrigerant is vaporized to produce a refrigerating effect is a(n)?

A Absorber B Concentrator C Condenser D Evaporator

47. Women prefer an effective temperature degree(s) higher than men.

A 4 B 3 C 2 D 1

48. A layer of clings to the face of any object.

A Heat B Air C Moisture D Dirt

49. The of an air-vapor mixture is the heat which affects only the dry bulb temperature of the mixture.

A Specific heat B Sensible heat C Latent heat D Dry heat

50. It is not recommended that one refrigerant be exchanged for another in a system?

A If the refrigerant has already been changed out previously B Unless capacity or efficiency of the compressor can be enhanced by doing so C Without approval of the compressor or system manufacturer D At all

51. A vessel in which vaporized refrigerant is liquefied by removal of heat is called a(n)?


52. The following absorbents can be used in commercial absorption machines except?

A Calcium chloride B Ethylene glycol C Lithium bromide D Lithium chloride


53. When cooling water by evaporation, the actual number of degrees the water temperature is reduced is known as the cooling?

A Average B Coefficient C Range D Ratio

54. The percentage of warm water entrained by the air and carried away from the cooling device is called the?

A Drift B Effluent C Flux D Waste

55. The theoretical horsepower required to drive a fan can be determined by multiplying the quantity of air (in cfm's) by the?

A Fan total pressure (at the fan outlet), divided by 6356, multiplied by the brake horsepower B Fan static pressure (at the fan outlet), divided by 6356, multiplied by the brake horsepower C Fan static pressure (at the fan outlet), divided by 6356 D Fan total pressure (at the fan outlet), divided by 6356

56. Using the velocity method to design ductwork, the velocity is?

A Evenly assigned to each section of the ductwork B Loosely estimated for each section of the ductwork C Highest at the end of the duct D Highest at the fan outlet

57. To determine the heat loss from a pipe, expressed in btuh's per lineal foot?

A Apply the formula 3.14 x R x R B Refer to Table 3-19 C Use special tools to make the calculations D Only the pipe size must be known

58. A device used to transfer heat between two physically separate fluids is a heat?

A Absorber B Exchanger C Mixer D Sensor


59. The 8-inch common face brick exterior is ten feet tall by 22 feet long. The inside of the wall is finished with 5/8 inch sand plaster. Inside design conditions will be 78 dry bulb and 65 wet bulb when the outdoor temperature is 97 dry bulb and 80 wet bulb. The heal, gain from the wall should be? Wind speed averages at 15 miles per hour.

A Less than 500 Btuh B Between 500 and 1,000 Btuh C Between 1,000 and 1,500 Btuh D More than 1,500 Btuh

60. According to the Trane Manual, the friction loss in inches of water per hundred feet of 36 inch round duct with a velocity of 35,000 cfm's is?

A .2 B .5 C .7 D .9

61. A should always be provided on the suction side of the compressor.

A Particulate basket B Filter C Liquid strainer D Scale trap

62. When the at the suction of the compressor becomes clogged, the suction pressure may fall.



63.

NOTE: L.s. ..PITOT TUBE

FIGURE 1 - GARAGE EXHAUST SYSTEM Refer to Figure I. The following traverse readings were taken with a pitot tube:

Station Velocity Pressure At Point (3a) 1 .24

2 .25 3 .36

At Point (3b) 1 .62 2 .64 3 .66

At Point (3c) 1 .32 2 .33 3 .34

The air volume handled by the fan in this system is? Assume standard air density.

A Less than 2,000 cfm B Between 2,000 and 2,400 cfm C Between 2,400 and 2,800 cfm D More than 2,800


64.

The following data was obtained from a test report on the fan shown in Figure 1.

At Point (1) Static Pressure = -2.0 inches WG Velocity Pressure = +0.50 inch WG

At Point (2) Static Pressure = +0.25 inch WG Velocity Pressure = +0.25 inch WG

The fan static pressure is?

A +0.25 inch wg B +0.50 inch wg C +1.75 inches wg D +2.00 inches wg


65.

SIDE VIEW FIGURE 2

CENTRAL STATION AIR CONDMONING UNIT

The central station air conditioning unit shown in Figure 2 was installed in accordance with the following specifications:

Cooling coil entering conditions: 78?F DB, 65?F WB Cooling coil leaving conditions: 56?F DB, 54?F WB Supply air fan: 9,200 cfm at 1-1/2 inches WG static pressure; 3 HP motor, 460 volts, 3 phase, 60

Hertz

The size of the refrigeration system required for this unit is?

A Less than 28 tons B Between 28 and 30 tons C Between 30 and 32 tons D More than 32


66.

SEA LEVEL 70 DEG. F. DB

FIGURE 3 DRYING OVEN

STATIC PRESSURE TAPS

The fan shown in Figure 3 is classified as a/an?

A Forward curved centrifugal fan B Backward inclined blade centrifugal fan C Air foil centrifugal fan D Axial fan


67.

SUPPLY DUCT

U

SIDE VIEW FIGURE 4, FIELD ERECTED HEATING SYSTEM

FAN AIR HEATER

PLAN VIEW DUCT FROM • OUTSIDE

The air heater shown in Figure 4 heats air at standard air conditions up to 200F. The density of the hot supply air is? Refer to Trane.

A Less than 0.055 pounds per cubic foot B Between 0.055 and 0.065 pounds per cubic foot C Between 0.065 and 0.075 pounds per cubic foot D More than 0.075


180 DEG. F. HOT WATER HEATING SYSTEM

GATE VALVE

••■•■■•••■•■••■■•■••••■

140 DEG. F. FROM HOT WATER HEATING SYSTEM

STEAM CONTROL VALVE

SATURATED STEAM- 15 PSIG

CONVERTER

1LJ

GATE VALVE

CHECK VALVE

U CONDENSATE

HOT WATER PUMP

3

FIGURE 5 - HOT WATER CONVERTER_

The hot water flow rate required for the system shown in Figure 5 is? Assume 1,000,000Btu per hour.

A Less than 35 gpm B Between 35 and 45 gpm C Between 45 and 55 gpm D More than 55

68.


69. The walls of a room are 12 feet long by 16 feet wide. The walls are 10 feet high. The outdoor temperature is 90 degrees and the indoor temperature is 75 degrees. The U value is .34. The heat gain is?

A Less than 2,000 B Between 2,000 and 3,000 C Between 3,000 and 4,000 D More than 4,000

70. Seventeen feet of 3A inch bare hot water pipe and 18 feet of 3 inch steam pipe pass through a conditioned room. The 3/4 inch pipe carries water at 180.degrees and tilp 3 inch pipe carries steam at 5 PSIG. The steam pipe is covered with 1-inch snap-on glass fiber insulation. The sensible heat gain from the pipes is?

A Less than 1,000 Btuh B Between 1,000 and 1,500 Btuh C Between 1,500 and 2,000 Btuh D More than 2,000 Btuh

71. The friction loss is .25 inches of water per 100 feet. The velocity is 3,200 feet per minute. The cubic feet of air per minute is?

A 30,000 B 32,000 C 35,000 D 40,000

72. The latent heat of vaporization for dry saturated steam at 80 degrees Fahrenheit is?

A 1054.3 B 1051.5 C 1048.6 D 1045.8

73. Studies indicate that women of all age groups prefer an effective temperature approximately than men.

A 1 degree lower B 1 degree higher C 2 degrees lower D 2 degrees higher

74. In pressure lubricated (refrigeration) compressors; the oil pump pressure is exerted on one bellows while the suction pressure is exerted on the other.

A Release B Discharge C Thermal D Head


75. When the scale trap at the suction of a (refrigeration) compressor becomes clogged, the suction pressure?

A Is unaffected B May fall to a point where the duplex switch will stop the compressor C May fall slightly D May fall to a point that the system can no longer function efficiently

76. The walls of a room are 14 feet long by 22 feet wide. The walls are 8 feet high. The outdoor temperature is 85 degrees and the indoor temperature is 70 degrees. The U value is .28. The heat gain is?


77. The boiling temperature of water is?

A 212 degrees Fahrenheit B Constant C Not constant D Under an atmospheric pressure of 14.7 psia

78. Sunshine State Heating and Air is about to install a new air conditioning system in a commercial building. Rob, the mechanical contractor, is evaluating the heat flow through the building. Rob knows that a layer of air clings to the face of any object. This, he knows, will cause a from the outdoor air to the inner face of the wall.

A Heat transfer B Drop in temperature C Increase in temperature D Difference in temperature

79. In pressure lubricated (refrigeration) compressors, the difference between the oil pumpdischarge pressure and the suction pressure is called the?

A Measured oil pressure B Oil pressure coefficient C Oil pressure differential D Usable oil pressure


80. Twenty-two feet of 1 inch bare hot water pipe and 30 feet of 2 inch steam pipe pass through a conditioned room. The 1 inch pipe carries water at 180 degrees and the 2 inch pipe carries steam at 5 PSIG. The steam pipe is covered with 1-inch snap-on glass fiber insulation. The sensible heat gain from the pipes is?


81. The friction loss is 1 inch of water per 100 feet. The velocity is 2,200 feet per minute. The cubic feet of air per minute is?

A 700 B 1,400 C 30,000 D 35,000

82. The latent heat of vaporization for dry saturated steam at 80 degrees Fahrenheit is?

A 1054.3 B 1051.5 C 1048.6 D 1045.8

83. The boiling point of ammonia is?

A 28 B 14.92 C - 41.36 D - 28.00

84. Women of all age groups prefer an effective temperature approximately how many degrees higher or lower than men?

A 1 degree higher in the summer B 1 degree lower in the winter C 5 degrees lower at all times D 1 degree higher at all times

85. Seven pounds of water are added to the air conditioned room per hour. The latent heat • to be removed to condense the moisture is?



86. One hundred couples will attend the matinee. The total sensible and latent heat contributed is?


87. There are three 34 hp motors, one 3 hp motor and two 2 hp motors in a conditioned space. The fan delivering the conditioned air is driven by a 3 hp motor located outside of the room but the fan system is inside the room. The 3/4 hp motors run 75 percent of the time, the 3 hp motor runs continuously, the 2 hp motors run 90 percent of the time. The sensible heat in Btuh's added to the room by the motors is?


88. In air conditioning systems, the percentage of warm water entrained by air and carried away from the cooling device is called the?

A Drift B Drip C Dew D Discharge

89. The boiling temperature of water is?

A 212 degrees Fahrenheit B Constant C Not constant D Under an atmospheric pressure of - 14.7 psia

90. Studies indicate that women of all age groups prefer an effective temperature approximately than men.

A 1 degree lower B 1 degree higher C 2 degrees lower D 2 degrees higher


91. ABC Heating and Air is about to install a new air conditioning system in a commercial building. Rob, the ABC mechanical contractor, is evaluating the heat flow through the building. Rob knows that a layer of air clings to the face of any object. This, he knows, will cause a from the outdoor air to the inner face of the wall.

A Heat transfer B Drop in temperature C Increase in temperature D Difference in temperature

92. In pressure lubricated (refrigeration) compressors, the oil pump pressure is exerted on one bellows while the suction pressure is exerted on the other.

A Release B Discharge C Thermal D Head

93. In pressure lubricated (refrigeration) compressors, the difference between the oil pump discharge pressure and the suction pressure is called the?

A Measured oil pressure B Oil pressure coefficient C Oil pressure differential D Usable oil pressure

94. When the scale trap at the suction of a (refrigeration) compressor becomes clogged, the suction pressure?

A Is unaffected B May fall to a point where the duplex switch will stop the compressor C May fall slightly D May fall to a point that the system can no longer function efficiently

95. In air conditioning systems, the percentage of warm water entrained by air and carried away from the cooling device is called the?

A Drift B Drip C Dew point D Discharge


96. A round duct 20 inches in diameter is required. What is the short side of the equivalent rectangular duct that may be used if the long side of the rectangular duct is 24 inches?

A 14 B 14.25 C 15 D 16.2

97. ABC Refrigeration, Inc. must determine the equivalent length of nonferrous pipe according to the Trane Manual. Pipe measurements taken are 2 feet, 5 feet, 10 feet, 15 feet and 20 feet. There will be six (6) long radius ells used. The pipe is 1 1/8 inches in diameter. The equivalent length is?

A 63.4 B 65.2 C 53.8 D 52.0

98. The cubic feet of air per minute is 3,000. The 28 by 16 rectangular duct is being replaced with a round duct. The friction for the round duct is?

A .060 B .068 C .084 D .094

99. The maximum total pressure for a Class II fan is?

A 33/4" B 63/4" C 121/4" D 181/4"

100. The standard construction material for large field erected cooling towers is?

A Galvanized steel B Redwood C Pressure treated lumber D Copper plating

101. A layer of clings to the face of any object.

A Heat B Air C Moisture D Dirt


102. It is not recommended that one refrigerant be exchanged for another in a system?

A If the refrigerant has already been changed out previously B Unless the capacity or efficiency of the compressor can be enhanced by doing so C Without approval of the compressor or system manufacturer D At all

103. When the at the suction of the compressor becomes clogged, the suction pressure may fall.


104. A vessel in which refrigerant is vaporized to produce a refrigerating effect is called a(n)?


105. The following absorbents can all be used in commercial absorption machines except?

A Calcium chloride B Ethylene glycol C Lithium bromide D Lithium chloride

106. The percentage of warm water entrained by the air and carried away from the cooling device is called the?

A Drift B Effluent C Flux D Waste

107. Using the velocity method to design ductwork, the velocity is?

A Evenly assigned to each section of the ductwork B Loosely estimated for each section of the ductwork C Highest at the end of the duct D Highest at the fan outlet


108. The standard construction material for large field erected cooling towers is?

A Aluminum B Redwood C Galvanized steel D Zinc

109. A room has a heat loss of 250,000 BTUH. The room must be maintained at 72 degrees F. The maximum temperature of the air supplied to the room can not exceed 100 degrees F. The quantity of are required is?

A Less than 8,000 CFM's B Between 8,000 and 8,200 CFM's C Between 8,200 and 8,400 CFM's D More than 8,400 CFM's

110. Velocity is 4,500 FPM. Friction is .65. The cubic feet of air flow per minute is?

A 20,000 B 25,000 C 27,000 D 30,000

111. Women of all age groups prefer an effective temperature approximately degree(s) higher than men.

A 4 B 3 C 2 D 1

112. The of the mixture.

of an air-vapor mixture is the heat which affects only the dry bulb temperature

A Specific heat B Sensible heat C Latent heat D Dry heat

113. A should always be provided on the suction side of the compressor.



114. A vessel in which vaporized refrigerant is liquefied by removal of heat is called a(n)


115. A device used to transfer heat between two physically separate fluids is called a heat?

A Absorber B Exchanger C Mixer D Sensor

116. When cooling water by evaporation, the actual number of degrees water temperature is reduced is known as the cooling?

A Average B Coefficient C Range D Ratio

117. The theoretical horsepower required to drive a fan can be determined by multiplying the quantity of air (in cfm's) by the?

A Fan total pressure (at the fan outlet), divided by 6356, multiplied by BHP B Fan static pressure (at the fan outlet), divided by 6356, multiplied by BHP C Fan static pressure (at the fan outlet), divided by 6356 D Fan total pressure (at the fan outlet), divided by 6356

118. To determine the heat loss from a pipe, expressed in Btuh's per lineal foot?

A Apply the formula 3.14 x R x R B Refer to Table 3-19 C Use special tools to make the calculations D Only the pipe size must be known

119. Which is not a liquid absorbent?

A Calcium chloride B Lithium bromide C Lithium chloride D Ethylene glycol


120. When should the installer use the equal friction method?

A When selecting a method between the velocity and static regain method B There is no such thing as the equal friction method C When the velocity method is not appropriate D When the static regain method is not appropriate

121. The wall is 8 inch thick common brick covered with % inch thick lightweight plaster. The wall is 40 feet long and10 feet high. Indoor temperature will be 78 degrees F when the outdoor temperature is 100 degrees F. The heat flow into the room is?

A Less than 3,000 BTUH B Between 3,000 and 3,200 BTUH C Between 3,200 and 3,400 BTUH D More than 3,400 BTUH

122. Whenever the noise level is an important consideration, mufflers can be used to minimize the transmission of?

A Pulsations B Vibrations C Sound D Noise

123. The purpose of the scale trap is to?

A Catch scale forming on the inside of the lines B Catch solder or dirt that may be carried through the discharge line C Catch solder or dirt that may be carried through the suction line D Remove surfactants that may be in the oil lines to the compressor

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

A Temperature difference B Temperature coefficient C Cooling range D Approach to the wet bulb

125. A gambling casino is 80 feet wide by 800 feet long with 12 foot ceiling height. The maximum outdoor air requirement for ventilation using maximum occupancy is?

A 120 CFM's B 30 CFM's C 7,680 CFM's D 230,400 CFM's


126. Since water has a specific heat of 1, the Btu's required to raise the temperature of one pound of water 10 degrees is?

A 12 Btu's B 10 Btu's C 14 Btu's D 8 Btu's

127. The latent heat of water vapor at low temperatures does not vary much from the average figure of?

A 1,020 Btu per lb. B 1,010 Btu per lb. C 1,050 Btu per lb. D 1,030 Btu per lb.

128. Ammonia used as refrigerant boils at?

A -28 F B -32 F C -20 F D -25 F

129. The capacity of compression systems and absorption systems depends upon the pressure existing in the evaporator since this determines the evaporator?

A Capacity B Superheat C Flash point D Temperature

130. The outlet velocity of a fan is obtained by dividing?

A The fan outlet area by the air volume B The air volume minus friction loss by the fan outlet area C The air volume by the fan outlet area D The air volume by the fan blade cross-section

131. 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


132. According to the Trane Manual, R-12 at 80 degrees Fahrenheit will exert a gauge pressure of?

A 98.8 B 101.8 C 84.17 D 81.25

133. 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

134. 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

135. 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 3.77

136.A chemical absorbent with distinct disadvantages is?

A Calcium chloride B Lithium bromide C Lithium chloride D Ethylene glycol

137. An evaporator pressure regulator is used in some systems to prevent the evaporator pressure from?

A Exceeding the preset level on the compressor B Causing the compressor to overheat C Rising above a preset level D Dropping below a predetermined point


138. Air tight construction is good for?

A Temperature control B Infiltration determination C Exfiltration control D Fire control

139. The service technician is reading a pressure of 101.494 at 80 degrees Fahrenheit. The technician is using refrigerant?

A R- 12 B R-22 C R-502 D HFC-134a

140. According to the Trane Manual, R-22 at 80 degrees Fahrenheit will exert a pressure of?

A 143.63 PSIA B 138.99 PSIG C 143.63 PSIG D 138.99 PSIA

141. The heat required to change a liquid to a vapor is called the?

A Humidity ratio B Latent heat of vaporization C Enthalpy D Latent heat of fusion

142. The constant pressure expansion valve maintains the pressure in the?

A Expansion valve B Evaporator C Compressor D Condenser

143. The auditorium in the theater seats 600 people. The cubic feet of fresh air per minute required are?

A 150 B 15 C 90,000 D 9,000


144. The temperature at which moisture will start to condense from the air is?

A Enthalpy B Dew point C Evaporation D Humidification

145. The accumulator is placed in the line to trap any liquid going to the compressor.

A Suction B Vapor C Liquid D Discharge

146. Low pressure fans are?

A Vane axial B Tube axial C Propeller D Centrifugal

147. Using the Trane Manual, the required line to service a 5 ton unit using R-22 vapor from the evaporator to the condenser at an equivalent length of 75 feet with a 3 psi drop is?

A 7/8 inches B 1 1/8 inches C 1 3/8 inches D . 3/4 inches

148. The temperature where moisture will condense from the air is?

A Wet bulb B Dew point C Dry bulb D Enthalpy

149. The controlling of the flow of fluid refrigerant to the cooling coils is done by?

A Solenoid valves B Pressure regulators C Expansion valves D Hot by-pass valves


150. According to the Trane Air Conditioning Manual, the heat required to change a solid to a liquid is the?

A Latent heat of vaporization B Latent heat of fission C Latent heat of fusion D Enthalpy transfer

151. The actual number of degrees the water temperature is reduced is known as the?

A Latent heat of vaporization B Latent heat of fusion C Cooling range D Approach to wet bulb

152. The boiling point of ammonia is?

A 28 degrees Fahrenheit B 82.11 degrees Fahrenheit C - 41.4 degrees Fahrenheit D - 28 degrees Fahrenheit

153. 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

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

A Environmental concern B Cost C Location D Productivity

155. 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

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

A Controlled B Variable C Constant D Unlimited

1 Exam Prep - Trane Air Conditioning Manual

32

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

A Approach B Range C Dew point D Condensation

158. 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

159. Refrigerant 134A boils at?

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

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

A 900 B 850 C 305 D 545

161. When using a psychrometer, the lowest reading is the?

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

162. Water has a specific heat of?

A 1 B .5 C .25 D .940


Part 2

1. According to Trane Air Conditioning Manual, a round duct 45.0" in diameter is equivalent to

a/an rectangular duct for equal friction and capacity.

A. 45" x 45" B. 48" x 40" C. 56" x 28" D. 58" x 30"

2. According to Trane Air Conditioning Manual, the maximum total pressure of an AMAC Class 11 fan

is inches.

A. 3-3/4 inches B. 6-3/4 inches C. 8-1/2 inches D. 12-1/4 inches

3. Given: 45°F suction 115°F condensing R - 22 delivered from receiver to evaporator 100 feet of 1-1/8" OD, type L copper tube 3 psi total pressure drop

According to Trane Air Conditioning Manual, the tonnage capacity of the line would be . Select the closest answer.

A. 19.5 tons B. 29.0 tons C. 36.2 tons D. 38.4 tons

4. According to Trane Air Conditioning Manual, the estimated overall heat transfer coefficient of a metal deck roof with built-up roofing, three inches of glass fiber insulation, 3/4 inch plaster ceiling is btu/hr/sq. ft. /°F. Assume winter conditions.

A. between 0.05 and 0.10 B. between 0.11 and-0.15 C. between 0.16 and-0.20 D. between 0.21 and 0,25


5. According to Trane Air Conditioning Manual, if the sensible heat gain to a room is 280,000 btuh and the ratio of sensible heat to total heat is 0.90, the latent heat gain to the room is

A. between 25,000 and 30,000 Btuh B. between 30,001 and 35,000 Btuh C . between 35,001 and 40,000 Btuh D. between 40,001 and 45,000 Btuh

6. According to Trane Air Conditioning Manual, the velocity in a 2-5/8 inch OD suction gas refrigerant line carrying 25 tons of R-22 is fpm.

A. 500 B. 1,000 C. 1,500 D. 2,000

7. According to Trane Air Conditioning Manual, the average air velocity in a supply air duct with a total pressure of — (1-1/2)" WG and a static pressure of -2" WG is fpm.

A. between 1,800 and 2,200 B. between 2,201 and 2,600 C. between 2.601 and 3,000 D. between 3,001 and 3,400

8. According to Trane Air Conditioning Manual, the minimum size round duct required to convey 16,000 cfm of air at a density of 0.035 pounds per cubic foot and a velocity of 1,200 fpm is .Select the closest answer.

A. 21" B. 27" C. 33" D. 50"

9. According to Trane Air Conditioning Manual, the pressure drop in 200 feet of four inch standard pipe

carrying 5,000 pounds of steam per hour, (initial pressure 5 psi) is

A. between 0 and 4 psi B. between 4 and 8 psi C. between 8 and 12 psi D. between 12 and 6 psi


10. According to Trane Air Conditioning Manual, the moisture content of air having a dew point temperature of 72 ° F is grains per pound of dry air. Select the closest answer.

A. 100 B. 110 C. 120 D. 130

11. According to Trane Air Conditioning Manual, the minimum size round duct required to convey 700 cfm of standard air at 1.50 inches friction pressure drop per 100 feet of duct is inches.

A. 7 inches B. 8 inches C. 9 inches D. 10 inches

12. According to Trane Air Conditioning Manual, non-freeze type steam coils are most commonly constructed of

A. single serpentine tubes B. fin spacing of 14 per inch C. steam distributing tubes extending into larger tubes D. individual orifices in the incoming steam tubes used to heat the leaving condensate

13. According to Trane, superheating of the refrigerant vapor in the suction line of a vapor compression refrigeration system

A. Increases the useful refrigerating effect of the system. B. Increases the capacity of the refrigerant compressor. C. Decreases the volume of refrigerant required per ton of capacity. D. Increases the power consumption of the compressor. E. Should be prevented.

14. According to Trane, the velocity in a 3-1/8" OD suction gas refrigerant line carrying 35 tons of R -22 is fpm.

A. 500 A 1,000 C. 1,500 D. 2,000 E. 2,500


15. Water vapor mixed with air has a pressure of 0.3631 psi and a temperature of 80 degrees F. The dew point of the air is

A. 40 deg. F B. 50 deg. F C. 60 deg. F. D. 70 deg. F E. So deg. F

16. According to Trane, an experimentally determined index of various combinations of temperature, humidity, and air movement which induce the same feeling of warmth is defined as

A. Effective temperature B. Dry bulb temperature C. Wet bulb temperature D. Dew point temperature E. Adiabatic saturation temperature

17. In order to cool an air conditioned space, the supply air is usually introduced into the room at

A. To degrees Fahrenheit B. 12 to 30 degrees below the required room temperature C. A velocity of 15 feet per minute D. 5 to 10 degrees below the required room temperature E. 60 degrees Fahrenheit with a velocity of 500 feet per minute

18. According to Trane, the maximum total pressure of an AMCA Class I fan is inches.

A. 3-3/4 inches B. 6-3/4 inches C. 8-1/2 inches D. 10-1/2 inches E. 12-1/4 inches

19. Given: A solar collector system is installed in a hot water heating system requiring 45,000 gallons per hour of water at 160 degrees Fahrenheit. Find the maximum btu collection of the system per hour if the water enters the collectors at 90 degree F. Select the closest answer.

A. 15,000,000 btuh B. 16,790,000 btuh C. 20,180,000 btuh D. 26,250,000 btuh


20. Given: a rectangular galvanized sheet metal duct is 48" wide x 12" deep. The aspect ratio of the rectangular duct is

A. 2 : 1 B. 3 : 1 C. 4 : 1 D. 5 : 1 E. 1 : 4

21. The term "aspect ratio" is defined as:

A. The ratio of the net area of an opening to the gross area. B. The ratio of length to width of an opening. C. The patio of the outlet velocity to the terminal velocity of an air stream. D. The ratio of the depth of a vane to the minimum width of the vane. E. The ratio of the long side to the short side of rectangular straight duct.

22. All fans tested in accordance with AMCA standards are rated based on "standard air", which is pounds per cubic foot density.

A. 14.7 B. 0.0750 C. 1.08 D. 4.45 E. 0.0175

23. The term "static regain" in relation to air duct design refers to:

A. Static pressure increases in the flow of air in a duct system due to increased velocity of the air. B. The reduction in total pressure due to dynamic losses within the system. C. The conversion of velocity pressure to static pressure when the system velocity reduces. D. An increase in the air velocity due to a decrease in duct area at constant air quantities. E. Air balancing of the system.

24. An AMCA class II factory assembled central station air handling unit is allowed a maximum external total static pressure range of inches W.G.

A. Less than 3 inches B. Between 3 to 5 inches C. Between 5 to 7 inches D. Between 7 to 9 inches E. Greater than 9 inches


Part 1 ANSWER KEY

1 B Trane Air Conditioning Manual 3

1 X 10 = 10

2 C Trane Air Conditioning Manual 90

3 A Trane Air Conditioning Manual 121

4 D Trane Air Conditioning Manual 205

























32 - 10 = 22

100 X 22 = 2,200


39

29 B Trane Air Conditioning Manual 7/3

212 - 50 = 162



3 X 1,050 = 3,150

32 B Trane Air Conditioning Manual 30/Table 3-16

3 X 1,180 M+ 15,500 X 80% M+

9,430 M+ MR Yields 25,370


Incandescent 4,000 X 3.4 M+

Fluorescent 6 X 1,000 X 3.4 X 1.2 M+

MR Yields 38,080 34 D Trane Air Conditioning Manual 48/Table 3-14

Sensible 64 X 275 M+

6 X 305 M+ MR is 19,430

Latent 64 X 275 M+

6 X 545 M+ MR is 20,870

19,430 + 20,870 X 50% Yields 20,150

35 A Trane Air Conditioning Manual 31/Table 3-17

Urn 8 X 1,353 M+

Fryer 50 X 14 M+

MR Yields 11,524 34/Table 3-22A


36 A Trane Air Conditioning Manual 34/Table 3-22A

Sensible

37

38

B

A

1.08 X 600 X 17 = 11,016

Latent .7 X 600 X 33.5 = 14,070 11,016 + 14,070 = 25,086

Trane Air Conditioning Manual

Trane Air Conditioning Manual

Enthalpy at 80 DB and 62 WB is 27.65

Enthalpy at 59 DB and 55 WB is 23.10

Change in Enthalpy is: 27.65 - 23.10 =4.55

64

92/89

54,000 + (4.5 X 4.55) = 2,637.36

Note: 4.5 is a given in moisture calculations


5,000 + 18,000 = 23,000

18,000 + 23,000% Yields 78.26



200 + 50 X 15 = 60

Note: 200 is a given for determining pounds of refrigerant


83 - 72 = 11 Degree difference

260,000 + 11 + 8.33 + 60 = 47.29

Note: 8.33 is pounds per gallon and 60 is minutes per hour


(8,000 X .75) + (6,356 X .63) = HP

6,000 + 4,004.28 = 1.49


Long side Short side = Aspect Ratio

20= 10 = 2

45 B 30 X 6 + 144.X 90% X 600 = 675

Note: 1 square foot is 144 square inches















59 D Trane Air Conditioning Manual 24/Table 3-5

22X 10 X .39 X 19= 1,630.2




63 D

Station Velocity Pressure At Point (3a) 1 .24

2 .25 3 .36

.85 + 3 = .28333

V = 4005 X Square root of .28333 V = 4005 X .5322 V = 2,132 CFM = Area X Velocity 10" Diameter = 5" Radius CFM = (3.1416 X 5" X 5" + 144) X 2,132 CFM = 1,163

At Point (3b) 1 .62 2 .64 3 .66

1.92 + 3 = .64

V = 4005 X Square root of .64 V = 4005 X .8 V = 3,204


CFM = Area X Volume 8" Diameter = 4" Radius CFM = (3.1416 X 4" X 4" + 144) X 3,204 CFM = 1,118

At Point (3c) 1 .32 2 .33 3 .34

.99 +3 =.33

V = 4005 X Square root of .33 V = 4005 X .5744 V = 2,300 CFM = Area X Volume 8" Diameter = 4" Radius

CFM = (3.1416 X 4" X 4"+144) X 2,300 CFM = 803

Total Air Volume = 3a CFM + 3b CFM + 3c CFM Total Air Volume = 1,163 + 1,118 + 803 Total Air Volume = 3,084

64 C

Formula: Fan Static = Static Pressure at Fan Outlet - Static Pressure at Fan Inlet

Point (1) is the input, Total = -2.0 + .50 = -1.5 Point (2) is the output, Static is = +.25

Fan Static = + .25 -(-1.5) Fan Static = 1.75

65 A

Use enthalpy chart BTUH = CFM X 4.5 X Enthaiphy Difference BTUH = 9200 X 4.5 X (30 - 22.6) BTUH = 9200 X 4.5 X 7.4 306,360 + 12,000 = 25.53

66 D

67 D

68 C

BTUH = GPM X 500 X Temp Difference 1,000,000 = GPM X500 X40 GPM = BTUH + (500 X Temp Difference)


GPM = 1,000,000 + (500 X 40) GPM 50


12 +16 X2 X10 X.34 X15=2,856

70 C Trane Air Conditioning Manual 32/Table 3-19

17 X 68 M+

18 X 39 M+

MR Yields 1,858







14 + 22 X 2 X 8 X .28 X 15 = 2,419.2




80 D Trane Air Conditioning Manual 32/Table 3-19

22 X 84 M+

30 X 30 M+

MR Yields 2,748


82 C Trane Air Conditioning Manual




1,050 X 7 = 7,350


200 X 225 M+

200 X 105 M+

MR Yields 66,000













40 X 10 X.35 X 22 = 3,080





80 X 800 ± 1,000X 120 = 7,680


1 X 10 = 10















Note: Couples are 2 people

87 A Trane Air Conditioning Manual 30/Table 3-16

3 X 2,650 X 75% M+

1 X 7,640 M+

2 X 6,440 X 90% M+

MR Yields 25,194.5











6X 1.9 + 2 + 5 + 10+ 15 + 20 = 63.4

98 B Trane Manual 282

99 B Trane Air Conditioning Manual Table 9-2











100 - 72 X 1.08 = 30.24

250,000 ÷ 30.24 = 8,267.1



















10 - 6 = 4 6 ± 4 X .3 = .45










Part 2

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