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  • Question

  • The efficiency of Diesel cycle increases with


  • Options
  • A. decrease in cut-off
  • B. increase in cut-off
  • C. constant cut-off
  • D. none of these

  • Correct Answer
  • decrease in cut-off 

    • Thermodynamics problems

    Search Results

    • 1. If the value of n = 0 in the equation pvn = C, then the process is called

    • Options
    • A. constant volume process
    • B. adiabatic process
    • C. constant pressure process
    • D. isothermal process
      • Discuss
    • 2. The compression ratio for petrol engines is

    • Options
    • A. 3 to 6
    • B. 5 to 8
    • C. 15 to 20
    • D. 20 to 30
      • Discuss
    • 3. Coal gas is obtained by mixing coal and gas at ambient conditions.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 4. The atomic mass of oxygen is

    • Options
    • A. 12
    • B. 14
    • C. 16
    • D. 32
      • Discuss
    • 5. The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

    • Options
    • A. Q = Cd x b2g(H2 - H1)
    • B. Q = Cd x b2g(H21/2 - H11/2)
    • C. Q = Cd x b2g(H23/2 - H13/2)
    • D. Q = Cd x b2g(H22 - H12)
      • Discuss
    • 6. One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.

    • Options
    • A. 8/3
    • B. 11/3
    • C. 11/7
    • D. 7/3
      • Discuss
    • 7. The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

    • Options
    • A. Boyle's law
    • B. Charles' law
    • C. Gay-Lussac law
    • D. all of these
      • Discuss
    • 8. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

    • Options
    • A. specific heat at constant volume
    • B. specific heat at constant pressure
    • C. kilo Joule
    • D. none of these
      • Discuss
    • 9. Stirling and Ericsson cycles are

    • Options
    • A. reversible cycles
    • B. irreversible cycles
    • C. semi-reversible cycles
    • D. quasi-static cycles
      • Discuss
    • 10. The most probable velocity of the gas molecules is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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