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

  • Which of the following refrigerant has the lowest boiling point?


  • Options
  • A. Ammonia
  • B. Carbon dioxide
  • C. Sulphur dioxide
  • D. R-12

  • Correct Answer
  • Carbon dioxide 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The rate of heat flow through a body is . The term x/kA is known as

    • Options
    • A. thermal coefficient
    • B. thermal resistance
    • C. thermal conductivity
    • D. none of these
      • Discuss
    • 2. In a psychrometric chart, specific humidity (moisture content) lines are

    • Options
    • A. vertical and uniformly spaced
    • B. horizontal and uniformly spaced
    • C. horizontal and non-uniformly spaced
    • D. curved lines
      • Discuss
    • 3. When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 are the temperatures of hot fluid at entry and exit point, and cold fluid has lower heat capacity rate as compared to hot fluid, then effectiveness of the heat exchanger is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. The emissive power of a body depends upon its

    • Options
    • A. temperature
    • B. physical nature
    • C. wave length
    • D. all of these
      • Discuss
    • 5. The ratio of the energy absorbed by the body to the total energy falling on it, is called

    • Options
    • A. absorptive power
    • B. emissive power
    • C. emissivity
    • D. none of these
      • Discuss
    • 6. In a domestic vapour compression refrigerator, the refrigerant commonly used is

    • Options
    • A. CO2
    • B. Ammonia
    • C. R-12
    • D. all of these
      • Discuss
    • 7. The human body feels comfortable when the heat stored in the body is

    • Options
    • A. positive
    • B. negative
    • C. zero
    • D. none of these
      • Discuss
    • 8. The freezing point of sulphur dioxide is

    • Options
    • A. -56.6°C
    • B. -75.2°C
    • C. -77.7°C
    • D. -135.8°C
      • Discuss
    • 9. 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
    • 10. In larger industrial and commercial reciprocating compression systems, refrigerent widely used is

    • Options
    • A. ammonia
    • B. carbon dioxide
    • C. sulphur dioxide
    • D. R-12
      • Discuss

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