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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. A low wet bulb temperature indicates very __________ humidity.

    • Options
    • A. low
    • B. high
      • Discuss
    • 2. The coefficient of venturifiume, generally, lies between

    • Options
    • A. 0.3 to 0.45
    • B. 0.50 to 0.75
    • C. 0.75 to 0.95
    • D. 0.95 to 1.0
      • Discuss
    • 3. The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.

    • Options
    • A. more than
    • B. less than
    • C. same as
      • Discuss
    • 4. In order to balance the reciprocating masses,

    • Options
    • A. primary forces and couples must be balanced
    • B. secondary forces and couples must be balanced
    • C. both (a) and (b)
    • D. none of these
      • Discuss
    • 5. A twist drill is a

    • Options
    • A. side cutting tool
    • B. front cutting tool
    • C. end cutting tool
    • D. none of these
      • Discuss
    • 6. A petrol engine has compression ratio from

    • Options
    • A. 6 to 10
    • B. 10 to 15
    • C. 15 to 25
    • D. 25 to 40
      • Discuss
    • 7. The thermal efficiency of diesel engines on weak mixtures is

    • Options
    • A. unaffected
    • B. lower
    • C. higher
    • D. dependent on other factors
      • Discuss
    • 8. In electro-discharge machining, dielectric is used to

    • Options
    • A. help in the movement of the sparks
    • B. control the spark discharges
    • C. act as coolant
    • D. all of these
      • Discuss
    • 9. It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be

    • Options
    • A. 10 r.p.m.
    • B. 20 r.p.m.
    • C. 120 r.p.m.
    • D. 180 r.p.m.
      • Discuss
    • 10. Which of the following metal shrinks most from molten state to solid state?

    • Options
    • A. Cast iron
    • B. Cast steel
    • C. Brass
    • D. Admirality metal
      • Discuss

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