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MCQs

Total Questions : 347 | Page 3 of 35 pages
Question 21. The knocking tendency in compression ignition engines for a given fuel will be
  1.    enhanced by decreasing compression ratio
  2.    enhanced by increasing compression ratio
  3.    dependent on other factors
  4.    none of the above
 Discuss Question
Answer: Option A. -> enhanced by decreasing compression ratio
Answer: (a).enhanced by decreasing compression ratio
Question 22. Diesel as compared to petrol is
  1.    highly ignitable
  2.    more difficult to ignite
  3.    less difficult to ignite
  4.    none of these
 Discuss Question
Answer: Option B. -> more difficult to ignite
Answer: (b).more difficult to ignite
Question 23. In a four stroke cycle engine, the sequence of operations is
  1.    suction, compression, expansion and exhaust
  2.    suction, expansion, compression and exhaust
  3.    expansion, compression, suction and exhaust
  4.    compression, expansion, suction and exhaust
 Discuss Question
Answer: Option A. -> suction, compression, expansion and exhaust
Answer: (a).suction, compression, expansion and exhaust
Question 24. The spark ignition engines are governed by
  1.    hit and miss governing
  2.    qualitative governing
  3.    quantitative governing
  4.    combination of (b) and (c)
 Discuss Question
Answer: Option C. -> quantitative governing
Answer: (c).quantitative governing
Question 25. If petrol is used in a diesel engine, then
  1.    low power will be produced
  2.    efficiency will be low
  3.    higher knocking will occur
  4.    black smoke will be produced
 Discuss Question
Answer: Option C. -> higher knocking will occur
Answer: (c).higher knocking will occur
Question 26. A two stroke cycle engine gives __________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
  1.    half
  2.    same
  3.    double
  4.    four times
 Discuss Question
Answer: Option C. -> double
Answer: (c).double
Question 27. A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of
  1.    75% iso-octane and 25% normal heptane
  2.    75% normal heptane and 25% iso-octane
  3.    75% petrol and 25% diesel
  4.    75% diesel and 25% petrol
 Discuss Question
Answer: Option A. -> 75% iso-octane and 25% normal heptane
Answer: (a).75% iso-octane and 25% normal heptane
Question 28. In natural uranium, the constituents of three naturally occuring isotopes are
  1.    U234 = 0.006%, U235 = 0.712% and U238 = 99.282%
  2.    U234 = 0.712%, U235 = 0.006% and U238 = 99.282%
  3.    U234 = 99.282%, U235 = 0.006% and U238 = 0.712%
  4.    U234 = 0.006%, U235 = 99.282% and U238 = 0.712%
 Discuss Question
Answer: Option A. -> U234 = 0.006%, U235 = 0.712% and U238 = 99.282%
Answer: (a).U234 = 0.006%, U235 = 0.712% and U238 = 99.282%
Question 29. During idling, a petrol engine requires __________ mixture.
  1.    lean
  2.    rich
  3.    chemically correct
  4.    None of these
 Discuss Question
Answer: Option B. -> rich
Answer: (b).rich
Question 30. By higher octane number of spark ignition fuel, it is meant that the fuel has
  1.    higher heating value
  2.    higher flash point
  3.    lower volatility
  4.    longer ignition delay
 Discuss Question
Answer: Option D. -> longer ignition delay
Answer: (d).longer ignition delay

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