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Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
  • Question

  • According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)


  • Options
  • A. Pb = pa - pv
  • B. Pb = pa + pv
  • C. Pb = pa x pv
  • D. Pb = pa/pv

  • Correct Answer
  • Pb = pa + pv 

    • More questions

    • 1. The centre of gravity of a quadrant of a circle lies along its central radius (r) at a distance of

    • Options
    • A. 0.5r
    • B. 0.6r
    • C. 0.7r
    • D. 0.8r
      • Discuss
    • 2. In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

    • Options
    • A. low
    • B. very low
    • C. high
    • D. very high
      • Discuss
    • 3. Oil separator in a refrigeration cycle is installed

    • Options
    • A. before compressor
    • B. between compressor and condenser
    • C. between condenser and evaporator
    • D. between condenser and expansion valve
      • Discuss
    • 4. The unit of angular velocity is

    • Options
    • A. m/min
    • B. rad/s
    • C. revolutions/min
    • D. both (B) and (C)
    • E. none of these
      • Discuss
    • 5. Which of the following boiler works on a forced circulation of water?

    • Options
    • A. La-mont boiler
    • B. Benson boiler
    • C. Loeffler boiler
    • D. all of these
      • Discuss
    • 6. The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called

    • Options
    • A. wet bulb temperature
    • B. dry bulb temperature
    • C. dew point temperature
    • D. none of these
      • Discuss
    • 7. For gas welding, the pressure desired at the welding torch for oxygen is

    • Options
    • A. 7 to 103 kN/m2
    • B. 70 to 280 kN/m2
    • C. 280 to 560 kN/m2
    • D. 560 to 840 kN/m2
      • Discuss
    • 8. The fuel valve in a four stroke cycle diesel engine

    • Options
    • A. opens at 15° after top dead centre and closes at 20° before bottom dead centre
    • B. opens at 15° before top dead centre and closes at 20° after top dead centre
    • C. opens at top dead centre and closes at bottom dead centre
    • D. may open and close anywhere
      • Discuss
    • 9. The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crank-case, is known as

    • Options
    • A. cleaning
    • B. priming
    • C. scavenging
    • D. detonation
      • Discuss
    • 10. As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

    • Options
    • A. increase maximum pressure and maximum temperature
    • B. reduce maximum pressure and maximum temperature
    • C. increase maximum pressure and decrease maximum temperature
    • D. decrease maximum pressure and increase maximum temperature
      • Discuss

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