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MCQs

Total Questions : 2096 | Page 31 of 210 pages
Question 301. The reaction A (l) R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The number of degrees of freedom are
  1.    1
  2.    2
  3.    3
  4.    0
 Discuss Question
Answer: Option B. -> 2
Question 302. In polytropic process (PVn = constant), if n = 1; it means a/an __________ process.
  1.    Adiabatic
  2.    Reversible
  3.    Isothermal
  4.    None of these
 Discuss Question
Answer: Option C. -> Isothermal
Question 303. Mollier diagram is a plot of
  1.    Temperature vs. enthalpy
  2.    Temperature vs. enthalpy
  3.    Entropy vs. enthalpy
  4.    Temperature vs. internal energy
 Discuss Question
Answer: Option C. -> Entropy vs. enthalpy
Question 304. In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in
  1.    Enhanced COP
  2.    Decreased COP
  3.    No change in the value of COP
  4.    Increased or decreased COP ; depending upon the type of refrigerant
 Discuss Question
Answer: Option A. -> Enhanced COP
Question 305. Melting of ice is an example of an __________ process.
  1.    Adiabatic
  2.    Isothermal
  3.    Isometric
  4.    None of these
 Discuss Question
Answer: Option B. -> Isothermal
Question 306. Claude's liquefaction process employs the cooling of gases by
  1.    Expansion in an engine
  2.    Following a constant pressure cycle
  3.    Throttling
  4.    None of these
 Discuss Question
Answer: Option A. -> Expansion in an engine
Question 307. A domestic refrigerator has a/an __________ cooled condenser.
  1.    Water
  2.    Air
  3.    Evaporative
  4.    Gas
 Discuss Question
Answer: Option B. -> Air
Question 308. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is
  1.    Positive
  2.    Negative
  3.    Zero
  4.    Infinity
 Discuss Question
Answer: Option C. -> Zero
Question 309. At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole.
  1.    72
  2.    92
  3.    142
  4.    192
 Discuss Question
Answer: Option B. -> 92
Question 310. PVy = constant, holds good for an isentropic process, which is
  1.    Reversible and isothermal
  2.    Isothermal and irreversible
  3.    Reversible and adiabatic
  4.    Adiabatic and irreversible
 Discuss Question
Answer: Option C. -> Reversible and adiabatic

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