Theoretical VCR with Dry Saturated Vapour after Compression MCQ

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• In a vapor compression refrigeration system, the coefficient of performance is observed as 10. If the enthalpy after compression is 1368.28 kJ/kg and after condensation is 598.58 kJ/kg. If the system works on 50% of the C.O.P., then what is the value of enthalpy after evaporation?
  ক

  1220

  খ

  1210

  গ

  1240

  ঘ

  1280
• If a process 1 – 2 undergoes a throttling. Which of the following represents the process 1 – 2?
  ক

  T1 = T2

  খ

  S1 = S2

  গ

  P1 = P2

  ঘ

  H1 = H2
• Find out the value of C.O.P. for the given values of enthalpies. h1 = 1126.25 kJ/kg h4 = 250.25 kJ/kg W = 120 kJ/kg
  ক

  5.3

  খ

  6.3

  গ

  7.3

  ঘ

  8.3
• What is the value of C.O.P. for the following p-h chart?
  ক

  (h1 − h4) / (h2 − h1)

  খ

  (h3 − h4) / (h2 − h1)

  গ

  (h2 − h4) / (h2 − h3)

  ঘ

  (h1 − h2) / (h3 − h4)
• What does point 2 say about the state of refrigerant?
  ক

  Wet vapor

  খ

  Dry saturated vapor

  গ

  Superheated vapor

  ঘ

  Liquid refrigerant
• What does the process 3-4 represent?
  ক

  Condensation

  খ

  Evaporation

  গ

  Compression

  ঘ

  Expansion
• What does the process 2-3 represent?
  ক

  Condensation

  খ

  Evaporation

  গ

  Compression

  ঘ

  Expansion
• What does the process 1-2 represent?
  ক

  Condensation

  খ

  Evaporation

  গ

  Compression

  ঘ

  Expansion
• Refrigerating effect corresponds to which of the following processes?
  ক

  Condensing process

  খ

  Vaporizing process

  গ

  Compression process

  ঘ

  Expansion process
• The ratio of COP of vapor compression cycle and COP of Carnot cycle is known as?
  ক

  Relative COP

  খ

  Ideal COP

  গ

  Performance index

  ঘ

  Theoretical COP
• Dry compression is preferred over wet compression.
  ক

  True

  খ

  False
• In which case does the compression process remains in superheated state?
  ক

  Wet state

  খ

  Dry state

  গ

  Semi-dry state

  ঘ

  Always
• One of the assumptions of the vapor compression cycle is that all of the processes are reversible.
  ক

  True

  খ

  False
• Entropy of dry-saturated vapor when Sf is 0.2513 and Sfg is 4.7878, is _______ Sf – Entropy of saturated liquid at pressure p Sfg – Entropy change during vaporization
  ক

  6.987

  খ

  5.987

  গ

  5.0391

  ঘ

  4.776
• In vapor compression cycle having dry saturated vapor at the end of compression the refrigeration effect is given by? H1 – Enthalpy of vapor before compression H4 – Enthalpy of vapor before entering evaporator H2 – Enthalpy of vapor after compression
  ক

  H1 – H4

  খ

  H2 – H4

  গ

  H1 × H4

  ঘ

  H2 × H4
• In vapor compression cycle having dry saturated vapor at the end of compression the work done is given by? H2 – Enthalpy of vapor after compression H1 – Enthalpy of vapor before compression
  ক

  H2 – H1

  খ

  H2 + H1

  গ

  H2 × H1

  ঘ

  H2 ÷ H1