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Which of the following has the least thermal efficiency?

A. Steam engine

B. Carnot engine

C. Diesel engine

D. Otto engine

Correct Answer : A.


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  1. In an irreversible process
  2. In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the…
  3. Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation.
  4. Refrigeration capacity of a household refrigerator may be round about __________ tons.
  5. Equation which relates pressure, volume and temperature of a gas is called the
  6. In any spontaneous process, the __________ free energy decreases.
  7. Critical compressibility factor for all substances
  8. Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming…
  9. Pick out the wrong statement.
  10. Gibbs free energy per mole for a pure substance is equal to the
  11. Enthalpy changes over a constant pressure path are always zero for __________ gas.
  12. Solubility of a substance which dissolves with an increase in volume and liberation of heat will be…
  13. Domestic refrigerator usually works on the __________ refrigeration cycle.
  14. In a reversible process
  15. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the
  16. For an isothermal process, the internal energy of a gas
  17. Internal energy of an ideal gas
  18. Which of the following is true for Virial equation of state?
  19. In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents…
  20. The amount of heat required to decompose a compound into its elements is __________ the heat of formation…
  21. Degree of freedom of the system ice-watervapour will be
  22. Work done in case of free expansion is
  23. A system in which there is exchange of energy but not of mass, is called a/an __________ system.
  24. An isolated system can exchange __________ with its surroundings.
  25. Melting of ice is an example of an __________ process.
  26. Heat is added at constant pressure in an ideal __________ cycle.
  27. Pick out the wrong statement.
  28. Throttling process is a/an __________ process.
  29. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at…
  30. Partial molar free energy of an element A in solution is same as its