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MCQs

Total Questions : 1124 | Page 3 of 113 pages
Question 21. The theoretically correct air fuel ratio for petrol engine is of the order of
  1.    6: 1
  2.    9: 1
  3.    12: 1
  4.    15: 1
 Discuss Question
Answer: Option D. -> 15: 1
Question 22. The inlet value of a four stroke cycle I.C engine remains open for nearly
  1.    180°
  2.    125°
  3.    235°
  4.    200°
 Discuss Question
Answer: Option C. -> 235°
Question 23. As a result of detonation in an I.C. engine, following parameter attains very high value
  1.    Peak pressure
  2.    Rate of rise of pressure
  3.    Rate of rise of temperature
  4.    Peak temperature
 Discuss Question
Answer: Option B. -> Rate of rise of pressure
Question 24. A higher compression ratio causes
  1.    Pre-ignition
  2.    Increase in detonation
  3.    Acceleration in the rate of combustion
  4.    Any one of these
 Discuss Question
Answer: Option D. -> Any one of these
Question 25. All heat engines utilize
  1.    Low heat value of oil
  2.    High heat value of oil
  3.    Net calorific value of oil
  4.    Calorific value of fuel
 Discuss Question
Answer: Option A. -> Low heat value of oil
Question 26. The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to
  1.    Inject fuel in a chamber of high pressure at the end of compression stroke
  2.    Inject fuel at a high velocity to facilitate atomization
  3.    Ensure that penetration is not high
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 27. In a petrol engine, the mixture has the lowest pressure at the
  1.    Beginning of suction stroke
  2.    End of suction stroke
  3.    End of compression stroke
  4.    None of these
 Discuss Question
Answer: Option B. -> End of suction stroke
Question 28. In case of gas turbines, the gaseous fuel consumption guarantees are based on
  1.    High heat value
  2.    Low heat value
  3.    Net calorific value
  4.    Calorific value
 Discuss Question
Answer: Option B. -> Low heat value
Question 29. The rating of a diesel engine, with increase in air inlet temperature, will
  1.    Increase linearly
  2.    Decrease linearly
  3.    Increase parabolically
  4.    Decrease parabolically
 Discuss Question
Answer: Option B. -> Decrease linearly
Question 30. Gaseous fuel guarantees are based on
  1.    Calorific value of oil
  2.    Low heat value of oil
  3.    High heat value of oil
  4.    Mean heat value of oil
 Discuss Question
Answer: Option B. -> Low heat value of oil

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