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The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

A. Less pronounced

B. More pronounced

C. Equal

D. Data insufficient, can't be predicted

Correct Answer : B.


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  1. If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change…
  2. Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance)?
  3. The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.
  4. Free energy change at equilibrium is
  5. Critical compressibility factor for all substances
  6. In case of the decomposition of hydroiodic acid (2HI H2 + I2), addition of H2 (at equilibrium condition)…
  7. Heat of formation of an element in its standard state is
  8. The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for
  9. The expression, nRT ln(P1/P2), is for the __________of an ideal gas.
  10. Number of phases in a colloidal system is:
  11. As the time is passing, entropy of the universe
  12. The adiabatic throttling process of a perfect gas is one of constant enthalpy
  13. At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole.
  14. The first law of thermodynamics is a restatement of the law of conservation of
  15. At triple point (for one component system), vapour pressure of solid as compared to that of liquid will…
  16. Which is not a refrigerant?
  17. The internal energy of an ideal gas is a function of its __________ only.
  18. The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.°K are
  19. A gas shows deviation from ideal behaviour at
  20. The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.
  21. A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system
  22. Specific volume of an ideal gas is
  23. The expression, nCv(T2 - T1), is for the __________ of an ideal gas.
  24. Which of the following is a widely used refrigerant in vapour compression refrigeration system (using…
  25. A large iceberg melts at the base, but not at the top, because of the reason that
  26. The kinetic energy of gas molecule is zero at
  27. The ammonia synthesis reaction represented by N2 + 3H2 2NH3; ΔH = - 22.4 kcal, is
  28. A gas performs the maximum work, when it expands
  29. Entropy change of mixing two liquid substances depends upon the
  30. As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine…