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COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about

A. 0.5

B. 3.5

C. 4.5

D. 8.5

Correct Answer : B.


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  1. Pick out the correct statement.
  2. Gibbs free energy (G) is represented by, G = H - TS, whereas Helmholtz free energy, (A) is given by,…
  3. The shape of T-S diagram for Carnot Cycle is a
  4. Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of…
  5. In a turbine, the fluid expands almost
  6. The four properties of a system viz. P, V, T, S are related by __________ equation.
  7. Pick out the wrong statement.
  8. A change in state involving a decrease in entropy can be spontaneous, only if
  9. The unit of fugacity is the same as that of the
  10. A refrigeration cycle is the same as a __________ cycle,
  11. For the reversible exothermic reaction, N2 + 3H2 2NH3, increase of pressure would
  12. When a gas is subjected to adiabatic expansion, it gets cooled due to
  13. The expression, nCv(T2 - T1), is for the __________ of an ideal gas.
  14. Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is
  15. The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio…
  16. __________ functions are exemplified by heat and work.
  17. First law of thermodynamics deals with the
  18. Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition…
  19. Pick out the wrong statement.
  20. Gibbs-Duhem equation
  21. Heat is added at constant temperature in an ideal __________ cycle.
  22. What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid…
  23. The first law of thermodynamics is a restatement of the law of conservation of
  24. PVγ = Constant (where, γ = Cp/Cv) is valid for a/an __________ process.
  25. For equilibrium process (i.e. reversible) in an isolated system
  26. It is desired to bring about a certain change in the state of a system by performing work on the system…
  27. The partial pressure of each constituent present in an alloy is __________ the total vapor pressure…
  28. For an irreversible process involving only pressure-volume work
  29. Isobaric process means a constant process.
  30. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the