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MCQs

Total Questions : 1124 | Page 51 of 113 pages
Question 501. Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to
  1.    Cylinder walls being too hot
  2.    Any one of the listed here
  3.    Red hot carbon deposits on cylinder walls
  4.    Overheated spark plug points
 Discuss Question
Answer: Option B. -> Any one of the listed here
Question 502. The ignition quality of diesel oil is expressed by
  1.    Cetane number
  2.    Calorific value
  3.    None of the listed here
  4.    Octane number
 Discuss Question
Answer: Option A. -> Cetane number
Question 503. The specific fuel consumption per B.P. hour for a diesel engine is about
  1.    0.25 kg
  2.    0.35 kg
  3.    0.3 kg
  4.    0.2 kg
 Discuss Question
Answer: Option D. -> 0.2 kg
Question 504. The specific fuel consumption per B.P. hour for a petrol engine is about
  1.    0.3 kg
  2.    0.2 kg
  3.    0.35 kg
  4.    0.25 kg
 Discuss Question
Answer: Option D. -> 0.25 kg
Question 505. The octane number of petrol, generally available, is
  1.    60 to 80
  2.    20 to 40
  3.    80 to 100
  4.    40 to 60
 Discuss Question
Answer: Option C. -> 80 to 100
Question 506. In a cycle, the spark lasts roughly for
  1.    0.001 sec
  2.    0.1 sec
  3.    0.01 sec
  4.    1 sec
 Discuss Question
Answer: Option A. -> 0.001 sec
Question 507. In a four stroke cycle petrol engine, the expansion
  1.    May start and end anywhere
  2.    Starts at 30° after top dead center and ends at 50° after bottom dead center
  3.    Starts at top dead center and ends at bottom dead center
  4.    Starts at 30° before top dead center and ends at 50° before bottom dead center
 Discuss Question
Answer: Option D. -> Starts at 30° before top dead center and ends at 50° before bottom dead center
Question 508. The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called
  1.    Overall efficiency
  2.    Indicated thermal efficiency
  3.    Mechanical efficiency
  4.    Volumetric efficiency
 Discuss Question
Answer: Option A. -> Overall efficiency
Question 509. In a petrol engine, if diesel is used, then the engine will
  1.    Run at high speed
  2.    Not run
  3.    Run more efficiently
  4.    Explode
 Discuss Question
Answer: Option B. -> Not run
Question 510. The brake power of a diesel engine, keeping other parameters constant, can be increased by
  1.    Decreasing the pressure of intake air
  2.    Decreasing the density of intake air
  3.    Increasing the temperature of intake air
  4.    Increasing the pressure of intake air
 Discuss Question
Answer: Option D. -> Increasing the pressure of intake air

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