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  • The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)


  • Options
  • A. The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the c
  • B. The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the c
  • C. The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the c
  • D. The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the c

  • Correct Answer
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    • More questions

    • 1. One tonne of refrigeration (1TR) means that the heat removing capacity is

    • Options
    • A. 21 kJ/min
    • B. 210 kJ/min
    • C. 420 kJ/min
    • D. 620 kJ/min
      • Discuss
    • 2. During braking, the brake shoe is moved outward to force the lining against the

    • Options
    • A. wheel piston or cylinder
    • B. anchor pin
    • C. brake drum
    • D. wheel rim or axle
      • Discuss
    • 3. A tensile test is performed on a round bar. After fracture, it has been found that the diameter remains approximately same at fracture. The material under test was

    • Options
    • A. mild steel
    • B. cast iron
    • C. glass
    • D. copper
      • Discuss
    • 4. The difference between dry bulb temperature and wet bulb temperature, is called

    • Options
    • A. dry bulb depression
    • B. wet bulb depression
    • C. dew point depression
    • D. degree of saturation
      • Discuss
    • 5. Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

    • Options
    • A. one
    • B. two
    • C. three
    • D. four
      • Discuss
    • 6. The logarithmic mean temperature difference (tm) is given by (where ?t1 and ?t2 are temperature differences between the hot and cold fluids at entrance and exit)

    • Options
    • A.
    • B.
    • C. tm = (?t1 - ?t1) loge(?t1/?t1)
    • D.
      • Discuss
    • 7. The water tubes in a simple vertical boiler are

    • Options
    • A. horizontal
    • B. vertical
    • C. inclined
      • Discuss
    • 8. The maximum deflection of a fixed beam carrying a central point load lies at

    • Options
    • A. fixed ends
    • B. centre of beam
    • C. l/3 from fixed ends
    • D. none of these
      • Discuss
    • 9. Instead of valves, the ports are used in case of

    • Options
    • A. four stroke I.C. engines
    • B. two-stroke I.C. engines
    • C. V-6 engines
    • D. none of these
      • Discuss
    • 10. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

    • Options
    • A. operating the machine at higher speeds
    • B. operating the machine at lower speeds
    • C. raising the higher temperature
    • D. lowering the higher temperature
      • Discuss

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