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  • Question

  • Which of the following statement is correct according to Clausis statement of second law off thermodynamics?


  • Options
  • A. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
  • B. It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
  • C. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
  • D. none of the above

  • Correct Answer
  • It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source. 

    • Thermodynamics problems

    Search Results

    • 1. A good fuel should have __________ ignition point.

    • Options
    • A. high
    • B. low
      • Discuss
    • 2. When the finely ground coal is moulded under pressure with or without a binding material, the resulting fuel is called briquetted coal.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 3. The isothermal and adiabatic processes are regarded as

    • Options
    • A. reversible process
    • B. irreversible process
    • C. reversible or irreversible process
    • D. none of these
      • Discuss
    • 4. The oxygen atom is __________ times heavier than the hydrogen atom.

    • Options
    • A. 2
    • B. 4
    • C. 8
    • D. 16
      • Discuss
    • 5. The lower calorific value of fuel may be obtained by adding the heat of steam formed during combustion to the higher calorific value.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 6. The amount of heat obtained by the complete combustion of 1 kg of a fuel when the products of its combustion are cooled down to the temperature of supplied air is called __________ calorific value offuel.

    • Options
    • A. higher
    • B. lower
      • Discuss
    • 7. Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, ? = cp/cv, known as adiabatic index, and R = Gas constant)

    • Options
    • A.
    • B. cp - cv = R
    • C.
    • D. Both (B) and (C)
      • Discuss
    • 8. The elements are made up of minute and chemically invisible particles as atoms.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. In a steady flow process, the ratio of

    • Options
    • A. heat transfer is constant
    • B. work transfer is constant
    • C. mass flow at inlet and outlet is same
    • D. all of these
      • Discuss
    • 10. The __________ is obtained when carbonisation of coal is carried out at 500° to 700° C.

    • Options
    • A. soft coke
    • B. hard coke
    • C. pulverised coal
    • D. bituminous coal
      • Discuss

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