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  • Question

  • 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

  • Correct Answer
  • soft coke 

    • Thermodynamics problems

    Search Results

    • 1. 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
    • 2. The elements are made up of minute and chemically invisible particles as atoms.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. 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
    • 4. 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
    • 5. 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
      • Discuss
    • 6. The property of the system, whose value for the entire system is equal to the sum of their values for the individual parts of the system is called extensive property

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 7. The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

    • Options
    • A. r? - 1
    • B. 1 - r? - 1
    • C.
    • D.
      • Discuss
    • 8. Which of the following is a reversible non-flow process?

    • Options
    • A. Isochoric process
    • B. Isobaric process
    • C. Hyperbolic process
    • D. all of these
      • Discuss
    • 9. The bomb calorimeter is used for finding the __________ calorific value of solid and liquid fuels.

    • Options
    • A. higher
    • B. lower
      • Discuss
    • 10. The efficiency of the Carnot cycle may be increased by

    • Options
    • A. increasing the highest temperature
    • B. decreasing the highest temperature
    • C. increasing the lowest temperature
    • D. keeping the lowest temperature constant
      • Discuss

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