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Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
  • Question

  • The colour of the flame of halide torch, in case of leakage of freon refrigerant, will change to


  • Options
  • A. bright green
  • B. yellow
  • C. red
  • D. orange

  • Correct Answer
  • bright green 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The wet bulb temperature during sensible cooling of air

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 2. A grey body is one whose absorptivity does not vary with temperature and wave length of the incident ray.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The emissivity of a polished silver body is __________ as compared to black body.

    • Options
    • A. same
    • B. low
    • C. very low
    • D. high
      • Discuss
    • 4. During sub-cooling, sensible heat from a liquid refrigerant is removed.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 5. The mass of water vapour present in __________ is called absolute humidity.

    • Options
    • A. 1 m3 of wetair
    • B. 1 m3 of dry air
    • C. 1 kg of wet air
    • D. 1 kg of dry air
      • Discuss
    • 6. In absorption vapour systems, the refrigerant widely used is R-12.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 7. In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

    • Options
    • A. heated and dehumidified
    • B. heated and humidified
    • C. cooled and humidified
    • D. cooled and dehumidified
      • Discuss
    • 8. The final relative humidity of the air during cooling and dehumidification is generally __________ than that of entering air.

    • Options
    • A. lower
    • B. higher
      • Discuss
    • 9. The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The by-pass factor of the heating coil is

    • Options
    • A. 0.376
    • B. 0.4
    • C. 0.6
    • D. 0.67
      • Discuss
    • 10. Prandtl number (PN) is given by PN = ?.cp/k.

    • Options
    • A. Yes
    • B. No
      • Discuss

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