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

  • The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to


  • Options
  • A. -1/3
  • B. -2/3
  • C. 1
  • D. -1

  • Correct Answer
  • -1/3 

    • More questions

    • 1. The injection pressure in a diesel engine is about

    • Options
    • A. 10 bar
    • B. 100 bar
    • C. 150 bar
    • D. 500 bar
      • Discuss
    • 2. The discharge is __________ at critical pressure.

    • Options
    • A. zero
    • B. minimum
    • C. maximum
      • Discuss
    • 3. The heating and expanding of a gas is called thermodynamic system.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 4. The workdone in a free expansion process is zero.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The rivets are used for __________ fastenings.

    • Options
    • A. permanent
    • B. temporary
      • Discuss
    • 6. The limit of eccentricity is based upon no tension condition.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A file with 50 - 60 teeth in 25 mm is called bastard file.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Blast furnace is used to produce

    • Options
    • A. pig iron
    • B. cast iron
    • C. wrought iron
    • D. steel
      • Discuss
    • 9. In welding aluminium with TIG arc welding, alternating current is used.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 10. German silver contains

    • Options
    • A. 1% silver
    • B. 2% silver
    • C. 5% silver
    • D. no silver
      • Discuss

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