REFRIGERATION FILLING BLANKS AND MATCH COLUMNS CLASS NOTES

REFRIGERATION FILLING BLANKS AND

MATCH COLUMNS CLASS NOTES

 

In refrigeration, fill in blanks is

done with deep understanding and

clarity. This process of filling blanks

 increases knowledge. It helps  to

apply fundamentals in real life

applications.

Fig. Simple Vapor Compression Refrigeration

Fig. Vapor Absorption Refrigeration

Fill in the blanks in refrigeration is from university question papers.

1. The high pressure is from —————— to ———————–in a refrigeration system.

2. The condition of refrigerant at the inlet of evaporator is ————–liquid and vapor.

3. At the outlet of evaporator, the condition of refrigerant  is ——— and —— vapor.

4. Inlet of the compressor, the condition of refrigerant is ———-pressure and —–temperature vapor.

5. Refrigerant condition at the outlet of compressor is high————- and high———vapor.

6. The refrigerant at the inlet of condenser is ————– pressure and ———temperature vapor.

7. The state of refrigerant at the outlet of condenser is high ———— and high———– liquid.

8.  Refrigerant at the inlet of expansion valve is ——-pressure and ——temperature liquid.

9. At the inlet of the evaporator, the condition of refrigerant is ————–liquid and vapor.

10. The condition of refrigerant at the outlet of evaporator is  ———and —– vapor.

11.  Most commonly used Freon R—and R—are banned,

12.  Refrigerant used in industry is ———————.

13.  Window air conditioner  ————-as a refrigerant.

14. The condenser is the ——–pressure side of a refrigeration system.

15. The low pressure side starts from ————–expansion valve and ends at ———–of compressor.

16. The high pressure starts —————- of compressor and ends at the ——————–expansion valve.

17. The function of the compressor is to increase ————— and —————.

18. Refrigeration is a process of ——————–.

19.  Refrigeration protects —————–against spoilage.

20.  Growth of bacteria is greater in a ————————-atmosphere.

21.  Growth of bacteria stops with the use of —————.

22. Principle of refrigeration is that ————causes cooling.

23. Refrigeration capacity is in —————–.

24. One ton of refrigeration is equal to ——————kJ/day.

25. Cooling capacity of one ton of refrigeration is equal to ——————kJ/hour.

26. Machine producing refrigeration is a ————————system.

27. Most popular system which produces refrigeration is ———————-.

28.  Refrigeration system using a ——————is a vapor compression refrigeration system.

29.  System producing cooling with water is  ————————-.

30. ————-energy runs the vapor absorption refrigeration system.

31. In an absorption refrigeration system, the refrigerant separates from the absorbent in the ——–.

32. The flow of refrigerant increases with the ——– of pressure in the evaporator with the automatic expansion valve.

33. In absorption system, absorbent absorbs the refrigerant in the —————–.

34. Refrigerant  flow increases with the increase of————–load in the evaporator

35. In the refrigeration system, name low pressure as ——————-, suction pressure and evaporator pressure.

36.  The other name of high pressure of the refrigeration system is ——————-, discharge pressure and condensing pressure.

37.  Compressor in the refrigeration system compresses the vapors and increases its —————-and —————.

38.  Oil separator separates the ——————-from the compressed refrigerant.

39.  Cool condensers with air , with water and —————.

40. The condenser changes the vapor refrigerant into a ———————-state.

41. Receiver is a —————————–tank.

42. Expansion valve changes high pressure liquid refrigerant into —————liquid.

43. Accumulator —————–the liquid which comes from the evaporator.

44. Muffler reduces the suction and discharge —————— of the compressor.

45. Use—————pipe in the ammonia vapor absorption refrigeration system.

46. There is no ————–part in the vapor absorption refrigeration system.

47. Gases charged in the Electrolux refrigerator are —————-and —————–. 

48. Evaporator used in the domestic units is ————evaporator.

49. Commercial refrigeration uses an evaporator which is ————-evaporator.

50. Industrial refrigeration uses an evaporator which is  ————-evaporator.

51. Place the evaporator between —————- and —————-.

52. Degree of super heat in dry evaporators is ————–.

53. Standard degree of super heat  is ————–.

54. In actual practice, degree of super heat is ————–.

55. Refrigerant evaporates in the evaporator by taking ——–heat in the evaporator.

56. Refrigerant absorbs latent heat from the ——– cooled.

57. Other name of evaporator is  ——unit.

58. Pressure of the refrigerant is ——in the evaporator.

59. Temperature of the refrigerant is ——in the evaporator.

60. State of the refrigerant at the inlet of the evaporator is mostly————.

61. At the outlet of the dry evaporator, state of the refrigerant  is ————-vapor.

62. Name of the unit between the flooded evaporator and compressor is ————.

63. Expansion valve used with dry evaporators is ———-.

64. The expansion valve used with flooded evaporators is ——-side float

65. Evaporation temperature in the evaporator depends upon the ————in the evaporator.

66. Link evaporator pressure to the ——boiling point of the refrigerant.

67. Most of the evaporators have pressure  ———- atmospheric pressure.

68. Outlet of the flooded evaporator has refrigerant as  ——–and————.

69. Material of the evaporator tubes is ————–with ammonia as refrigerant.

70. Use evaporator tubes of  ————— with refrigerant R-134a.

71. COP of a refrigeration unit———–with the decrease of evaporation temperature.

72. Power input increases as evaporator temperature ————.

73. Condenser removes ——— and ——— heat.

74. Vapors change into liquid in the condenser at the  ———— temperature.

75. In the condenser, vapors change into liquid at a  ———temperature.

76. ————- refrigeration plants use air cooled condensers.

77. Refrigeration plants use water cooled condensers with —capacity.

78. ————capacity refrigeration plants use evaporative cooled condensers.

79. ———–cools condenser hot water for reusing in the condenser.

80. Blower used in the cooling tower causes ——– draft.

81. Cooling tower uses—-pump for recirculate of condenser hot water.

82. Receiver stores the ———pressure liquid refrigerant.

83. The installation of the receiver is between the condenser and the————-cum filter.

84. Drier cum filter uses a fine metallic——–.

85. Filter cum drier contains——for removing water from the—————.

86. Drier cum filter removes —————–particles and————–.

87. Filter cum Drier can be refillable or —————— type.

88. The location of the Drier cum filter is after the —————– in the refrigeration circuit.

89. Refrigeration system uses a receiver  with —————capacity.

90. A small refrigeration unit uses —— cooled condensers.

91. Evaporating condenser uses  water and ——– for condensing the refrigerant.

92. Outlet of the drier cum filter connects to   ————-device.

93. Cooling towers have natural, forced and ———— type drafts.

94. There is ——- difference in the aim of the cooling tower and the cooling —————.

95.  Oil separator separates————-from the refrigerant.

96. The compressor is ————- of the refrigeration unit.

97. Anemometer measures the ————–.

98. Dehydrator removes ———–from the refrigeration system.

99.  Detection of the leakage of Freon refrigerants is with——–.

100. Thermo-couple measures —————–.

101. One ton of refrigeration is equal to ————–kJ/hour.

102. In a refrigeration system, heat rejected in the condenser is equal to the sum of —————- and———-.

103. Temperature difference senses—————-heat.

104. Chemical name of R-134a is ————————————.

105. One Horse power in S.I. units is equal to —————Watts.

106. Running capacitor improves —————–.

107. COP increases with the increase of ———————pressure.

108. Bubbles in the sight glass indicates————–of liquid refrigerant in the refrigeration circuit.

109.  Saturated air has same dry bulb temperature, wet bulb temperature and ————-temperature.

110. The normal boiling point of ammonia is ———————.

111. ————–is constant in a reversible adiabatic process.

112.  Dry bulb temperature is the temperature of ——-air.

113.   Temperature of ——-air is the wet bulb temperature.

114. Air is refrigerant in the ————————-air conditioning.

115. The material of piping in vapor absorption is—————–.

116.  The material of pipe with R-134a is ———————.

117.  Liquid refrigerant —————-in the evaporator.

118. A receiver stores——-liquid refrigerant.

119. The function of the muffler in a refrigeration system is to reduce ———-.

120. The expansion process is at —————– enthalpy.

121. Process of expansion changes high pressure high temperature liquid into low pressure ——- and ——– .

122. Expansion valve used in small refrigeration unit is a ———–.

123. The gas which is a working substance in a refrigerating system is the ————————-.

124. Refrigerant produces———————in the evaporator.

125.  Chemical formula for R-22 is———————————.

126.  Refrigerant transfers heat from lower temperature to ——.

127.  Ammonia boils at —— and freezes at———-at atmospheric pressure.

128. Latent heat of ammonia is —————-.

129. Ammonia is not corrosive to ———————-.

130. The chemical formula of R-134 a is —————–.

131. Normal boiling point of R-22 is—————–.

132. Boiling point of R-134 a is ————-.

133. Practical use of carbon dioxide in refrigeration is in the form of ——————-.

134. In a Freon gas, which atoms—–&—-replace hydrogen. t

135. Name the compound of R-22—————————-.

136.   Spells the compound of R 134 a————————–.

137. Usually a solution of ————— and salt is a brine solution.

138. Most common salts used for making brine solution are sodium chloride and——————.

139. Freezing point of calcium chloride is——————–.

140. Common method of locating the leakage of refrigerant is by using—————.

141. Leakage of Freon refrigerant uses—————.

142. Latent heat of water is——————–

143. Ammonia is highly corrosive to————–..

144. Refrigeration system uses —–gas for flushing &  leakage testing.

145. Liquid refrigerant at low pressure ————–quickly in the evaporator.

146. Testing for inward leakage is by creating——in the system.

147. Testing of outward leakage is by putting —–in the system.

148. Time to check inward leakage is ——-.

149. The vacuum in the system for inward leakage is ——.

150. Soap solution method of leakage finding is for ——–refrigerants.

151. Halide torch finds the leakage of———refrigerants.

152. Leakage of refrigerant causes——- &——-.

153. The reason for ban on refrigerants R-12 & R-11 is——-& —–.

154. Dead line for stopping use of refrigerant R-22 is ——-.

155. The reason for not using Carbon Dioxide as refrigerant is its——critical temperature.

156. Refrigerant used in all aircrafts is —–.

157. Refrigerant used in industry is ——.

158. Air conditioners use —— refrigerant.

159. Global warming potential of ammonia is —-.

160. Ozone depletion potential of ammonia is —-. 

161.  Expansion valve controls the —— of refrigerant.

162. Fit the expansion valve between the———–and the—————–.

163. Boiling point of the refrigerant increases with the —————–of pressure.

164. State of the refrigerant after the expansion valve is mostly———-.

165. Use ——————- as expansion valve in the domestic refrigeration units.

166. Commercial refrigeration units use ————– as expansion valve.

167. Use low side————-valve in the industrial refrigeration units.

168. Use high side ———valve in the industrial refrigeration units.

169. Diameter of a capillary tube is only a few ————.

170.  Fit ———bulb of the thermostatic expansion valve at the outlet of the ————.

171. Automatic expansion valve maintains a —————–pressure in the ————.

172. Thermostatic expansion valve maintains a constant degree of—————–at the outlet of the ————.

173. Diameter and ————–of the capillary tube depends upon the ————–difference between the condenser and the —————.

174. A capillary tube can very easily ———–to stop the flow of refrigerant.

175. Flow of refrigerant in the low side float valve increases as ——–increases in the evaporator.

176. Rate of flow of refrigerant in the high side float valve increases as ——–increases in the condenser.

177. There is no ————-used with the high side float valve.

178. Expansion valve used with the hermetically sealed unit is————————–.

179. Compressor using a belt drive in a refrigeration system is —————.

180. In a refrigeration system, compressor  is the ———–of the system.

181. The function of the compressor is to ————–low temperature and low pressure vapors.

182. State of the refrigerant after compression is ——-pressure and ———–temperature.

183. Pressure increase in compressor causes decrease in—————.

184. Type of Compressor used in the domestic unit is —————–unit.

185. Most commonly used compressors in refrigeration are————, rotary and———.

186. Use Reciprocating compressors for high———difference and low—————.

187. Refrigerant used with rotary compressor is ——.

188. Use centrifugal compressors for ———pressure difference and high —–.

189. Refrigerants used with reciprocating compressors are R-22 and ——.

190. Use rotary compressors for medium pressure difference and ——–volume.

191. Various refrigerants used with centrifugal compressors are R-114 and R————-.

192. Boiling point of the refrigerant, used with reciprocating compressor, is much——— 0⁰.

193. With rotary compressors, the normal boiling point of the refrigerant  should ——— 0⁰ C.

194. Normal boiling point of the refrigerant, used with centrifugal compressor, is much——— 0⁰ C.

195. Material of construction of the compressor dome is—————.

196. Cool Ammonia compressors with ————-.

197. Piston’s  material of construction is—————.

198. Use———— for stopping the leakage around the valve stem of a service valve.

199. Cool Freon compressors with ————.

200. Connecting rod  material of construction  is—————.

201. Single acting compressor completes one cycle in —————-revolutions.

202. ————–cooling in between the compressors improves the COP.

203.  Piston reaches the bottom of the cylinder ———dead center.

204. Refrigerating capacity of the Compressor increases with the ———————of the compressor.

205. Volumetric efficiency increases with the ————of the compressor.

206. Hermetically sealed unit encloses ——-and———.

207. Speed of the compressor can be ————-by the use of a bigger pulley.

208. Oil separator separates ——-oil from the ———–.

209. In a hermetically sealed unit, speed of Motor and compressor is ————–

210.  Hermetically sealed unit runs at   ——– speed.

211. Domestic unit uses ———– as an expansion valve.

212. Hermetically sealed unit does not use———valves.

213. Refrigerant will not  —————-in a hermetically sealed unit.

214. Number of fins/inch in condenser coil of a window air conditioner is —————–

215. Suction pressure in the window air conditioner using R 22 is —————

216. Discharge pressure in a refrigerator using R-134 a is —————-

217. The relative humidity in an air conditioned room at 25⁰ C is—————-

218. The ammeter measures————–

219. A crankcase electrical  heater is ————–as the compressor is off.

220. 3000 k Cal are equivalent to—————–k J.

221. –40⁰ C is equal to —————⁰

222. The use of Halide torch is for ————————

223. Density of air whose specific volume is 12.5 m ³/kg is ——————-

224. One ton of refrigeration is equal to —————–k J/day

225. In a refrigeration system, condenser losses heat —————- the heat absorbed in the evaporator.

226. A thermometer senses —————–heat.

227. Chemical name of R-134 a is ———————————-

228. The three basic methods of heat transfer are —————————————————

229. One HP= ————–Watts

230. As refrigerant mixes with lubricating oil, viscosity ——————-

231. Running capacitor improves ——————————-

232.  As there is scaling in the water tubes of the condenser, ————of the compressor increases.

233. Heat required to raise temperature of 1⁰ C of 1 kg of water is its ————————–.

ANSWERS

1. Compressor, Expansion valve,

2. Saturated,

3. Dry, saturated,

4. low, low

5. pressure, temperature

6. high, high

7. pressure, temperature,

8. high, high

9. liquid, saturated,

10. saturated,

11. 12 , 11,

12. Ammonia,

13. R-22,

14. high,

15. middle, inlet

16. outlet, middle

17. Pressure temperature,

18. (Cooling),

19. (Food stuff),

20. (Hot and humid),

21. (Cooling),

22. (Evaporation),

23. Tons of refrigeration),

24. (302400),

25. (12600),

26. (refrigeration),

27. (Vapor compression refrigeration system),

28. (Compressor),

29. (Desert cooler),

30. (Heat),

31. (Generator),

32. (Absorber),

33. (Back pressure),

34. Coolin

35. (Head pressure),

36. (Temperature and pressure),

37. (Lubricating oil),

38. air & water

39. (Liquid),

40. (Storage),

41. (Low pressure),

42. (Stores),

43. (sound),

44. (Steel),

45. (Moving),

46. (Ammonia and Hydrogen). 

47. Dry,

48. Dry, 

49. Flooded,

50. Expansion vale, compressor,

51. zero,

52. 5⁰C, 

53. Variable,

54. latent, 

55. Products, 

56. Cooling, 

57. Low, 

58. Low, 

59. Liquid,

60. saturated, 

61. Accumulator, 

62. Capillary tube,

63. Low,

64. Pressure,

65. Normal,

66. Above, 

67. Liquid, vapor, 

68. Steel, 

69. Copper, 

70. Decreases, 

71. decreases

72. Super heat and latent heat, 

73. Saturation,

74. constant, 

75. Domestic units,

76. medium, 

77. Large,

78. Cooling tower,

79. Forced, 

80. Centrifugal,

81. High,

82. Drier,

83. sieve,

84. Silica gel,

85. Solid, moisture,

86. Replaceable,

87. Receiver,

88. Large,

89. Air,

90. Air,

91. Expansion,

92. Balanced

93. no, pond

94. oil, 

95. heart,

96. velocity,

97. Moisture,

98. Halide torch,

99. Temperature,

100. 12600,

101. Cooling effect, work input, 

102. sensible, 

103. Tetra-fluoro ethane

104. 735.5,

105. Power factor,

106. Evaporator, 

107.  Shortage,

108. dew point,

109. –33.5⁰C,   

110. Entropy, 

111. atmospheric 

112. saturated

113. aircraft

114. Steel,

115. copper,

116. Evaporates, 

117. high pressure

118. Noise

119. Constant,

120. Liquid, Vapor,

121. Capillary tube,

122. Refrigerant,

123. Cooling,

124. CH Cl F₂,

125. high temperature

126. —33.5 ⁰ C and –78 ⁰ C,

127. 1371 k J/kg, 

128. mild steel, 

129. C₂H₂F₄,

130. —41⁰ C, 

131. –27 ⁰ C,

132. Dry ice,

133. Decrease

134. Chlorine and Fluorine, 

135. Mono-chloro-difluoro-methane, 

136. Tetra fluoro ethane,

137. Water, 

138. Calcium chloride, 

139.  –46 ⁰ C, 

140. Soap solution,

141. Halide torch,

142. 2257 k J/kg,

143. Copper,

144. Carbon dioxide,

145. Evaporates,  

146. Vacuum,

147. Pressure,

148. 24 hours, 

149. Perfect vacuum,

150. All,

151. Freon,

152. Global warming, Ozone depletion,

153. High global warming, High ozone depletion, 

154. 2030, 

155. Low, 

156. Air, 

157. Ammonia, 

158. R-22,  

159. zero, 

160. Zero

161. rate of flow 

162. Condenser, evaporator,

163. Increase, 

164. Liquid,

165. capillary tube,

166. thermostatic expansion valve,

167. float, 

168. Float, 

169. millimeters, 

170. Feeler, evaporator

171. Constant, evaporator,

172. super heat, evaporator

173. Length, pressure,

174. choke,

175. evaporation, 

176. Condensation, 

177. Receiver, 

178. Capillary tube

179.  Open unit
180. Heart, 
181. Compress,
182. high, high,
183. volume,
184. hermetically sealed unit 
185. reciprocating, centrifugal, 
186. pressure, volume
187. isobutane, 
188. low, volume, 
189. Ammonia, 
190. Medium,
191. R-11, 
192. Below, 
193. Around
194. above above
195. Cast iron
196. Water 
197. Cast iron, 
198. Gland packing 
199. Air,
200. Cast iron,
201. two, 
202. Inter, 
203. bottom, 
204. speed, 
205. decrease, 
206. Compressor, motor 
207.  decreases, 
208. lubricating, refrigerant,
209. same, 
210. Constant
211. capillary tube, 
212. Service
213. leakage

214. 10

215. 5 atm

216. 11.5 bar

217. 50 %

218. measuring current

219. On

220. 12372 k J

221. –40⁰ F

222. detecting leakage of halogenated (Freon) refrigerants like R 22, R 134 a etc.

223. 0.08 kg/m ³

224. 302400 k J/day),

225. more

226. sensible heat

227. Tetra fluoro-ethane

228. conduction, convection and radiation

229. 735 .5 Watts

230. decreases

231. the full load efficiency and the power factor

232. HP

233. specific heat

Match the followings Columns

	Column I	Column II
1	Supply Duct	(A)   Source of air movement
2	Return Outlet	(B)   Treats air by adding heat
3	Filter	(C) Pathway through which air flows into the room
4	Cooling coil	(D)Removes room air
5	Heating chamber	(E) Treats air by removing heat and moisture
6	Fan	(F) Cleans the air
7	Return Duct	(G) Pathway through which air flows from the room.
8	Supply outlet	(h)Distributes air evenly within the room.

ANS: 1 with (h)

2 with (d)

3 with (f)

4 with (e)

5 with(B)

6 with (A)

7 with (g)

8 with (C)

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