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MCQs

Total Questions : 1124 | Page 7 of 113 pages
Question 61. For the same compression ratio
  1.    Otto cycle is more efficient than the Diesel
  2.    Diesel cycle is more efficient than Otto
  3.    Both Otto and Diesel cycles are, equally efficient
  4.    Compression ratio has nothing to do with efficiency
 Discuss Question
Answer: Option A. -> Otto cycle is more efficient than the Diesel
Question 62. The ratio of the brake power to the indicated power is called
  1.    Mechanical efficiency
  2.    Overall efficiency
  3.    Indicated thermal efficiency
  4.    Volumetric efficiency
 Discuss Question
Answer: Option A. -> Mechanical efficiency
Question 63. In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
  1.    Beginning of suction stroke
  2.    End of suction stroke
  3.    Beginning of exhaust stroke
  4.    End of exhaust stroke
 Discuss Question
Answer: Option A. -> Beginning of suction stroke
Question 64. The pressure inside the cylinder is _________ the atmospheric pressure during the exhaust stroke.
  1.    Equal to
  2.    Below
  3.    Above
  4.    None of these
 Discuss Question
Answer: Option C. -> Above
Question 65. A diesel engine has
  1.    1 valve
  2.    2 valves
  3.    3 valves
  4.    4 valves
 Discuss Question
Answer: Option C. -> 3 valves
Question 66. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is
  1.    Same
  2.    More
  3.    Less
  4.    Less or more depending on operating conditions
 Discuss Question
Answer: Option B. -> More
Question 67. Pick up the false statement
  1.    Thermal efficiency of diesel engine is about 34%
  2.    Theoretically correct mixture of air and petrol is approximately 15:1
  3.    High speed compression engines operate on dual combustion cycle
  4.    S.I. engines are quality governed engines
 Discuss Question
Answer: Option D. -> S.I. engines are quality governed engines
Question 68. The pressure and temperature at the end of compression stroke in a petrol engine are of the order of
  1.    4-6 kg/cm² and 200-250°C
  2.    6-12 kg/cm² and 250-350°C
  3.    12-20 kg/cm² and 350-450°C
  4.    20-30 kg/cm² and 450-500°C
 Discuss Question
Answer: Option B. -> 6-12 kg/cm² and 250-350°C
Question 69. The brake power is the power available
  1.    In the engine cylinder
  2.    At the crank shaft
  3.    At the crank pin
  4.    None of these
 Discuss Question
Answer: Option B. -> At the crank shaft
Question 70. Which one of the following engines will have heavier flywheel than the remaining ones?
  1.    30 kW four-stroke petrol engine running at 1500 r.p.m.
  2.    30 kW two-stroke petrol engine running at 1500 r.p.m.
  3.    30 kW two-stroke diesel engine running at 750 r.p.m.
  4.    30 kW four-stroke diesel engine running at 750 r.p.m.
 Discuss Question
Answer: Option A. -> 30 kW four-stroke petrol engine running at 1500 r.p.m.

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