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MCQs

Total Questions : 1124 | Page 13 of 113 pages
Question 121. Detonation is harmful due to
  1.    Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
  2.    Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
  3.    High intensity of knock causes crankshaft vibration and the engine runs rough
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above
Question 122. Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of
  1.    Plates
  2.    Pallets
  3.    Pins
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 123. Engine pistons are usually made of aluminium alloy because it
  1.    Is lighter
  2.    Wear is less
  3.    Absorbs shocks
  4.    Is stronger
 Discuss Question
Answer: Option A. -> Is lighter
Question 124. The reason for supercharging in any engine is to
  1.    Increase efficiency
  2.    Increase power
  3.    Reduce weight and bulk for a given output
  4.    Effect fuel economy
 Discuss Question
Answer: Option C. -> Reduce weight and bulk for a given output
Question 125. Morse test can be conducted for
  1.    Petrol engines
  2.    Diesel engines
  3.    Multi cylinder engines
  4.    All of these
 Discuss Question
Answer: Option C. -> Multi cylinder engines
Question 126. The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of
  1.    0
  2.    50
  3.    100
  4.    120
 Discuss Question
Answer: Option C. -> 100
Question 127. Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of
  1.    0
  2.    50
  3.    100
  4.    120
 Discuss Question
Answer: Option A. -> 0
Question 128. The scavenging efficiency of a four stroke cycle diesel engine is
  1.    Below 50%
  2.    Between 50 and 85%
  3.    Between 85 and 95%
  4.    Between 95 and 100%
 Discuss Question
Answer: Option D. -> Between 95 and 100%
Question 129. Scavenging is usually done to increase
  1.    Thermal efficiency
  2.    Speed
  3.    Power output
  4.    Fuel consumption
 Discuss Question
Answer: Option C. -> Power output
Question 130. Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine in r.p.m.
  1.    Equal to
  2.    One-half
  3.    Twice
  4.    Four-times
 Discuss Question
Answer: Option B. -> One-half

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