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MCQs

Total Questions : 1124 | Page 17 of 113 pages
Question 161. In compression ignition engines, swirl denotes a
  1.    Haphazard motion of the gases in the chamber
  2.    Rotary motion of the gases in the chamber
  3.    Radial motion of the gases in the chamber
  4.    None of the above
 Discuss Question
Answer: Option B. -> Rotary motion of the gases in the chamber
Question 162. In a four stroke cycle petrol engine, the compression
  1.    Starts at 40° after bottom dead centre and ends at 30° before top dead centre
  2.    Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
  3.    Starts at bottom dead centre and ends at top dead centre
  4.    May start and end anywhere
 Discuss Question
Answer: Option A. -> Starts at 40° after bottom dead centre and ends at 30° before top dead centre
Question 163. In a four stroke cycle diesel engine, the compression
  1.    Starts at 40° after bottom dead center and ends at 10° before top dead center
  2.    Starts at 40° before top dead center and ends at 40° after top dead center
  3.    Starts at top dead center and ends at 40° before bottom dead center
  4.    May start and end anywhere
 Discuss Question
Answer: Option A. -> Starts at 40° after bottom dead center and ends at 10° before top dead center
Question 164. In a four stroke cycle diesel engine, the inlet valve
  1.    Opens at 20° before top dead center and closes at 40° after bottom dead center
  2.    Opens at 20° after top dead center and closes at 20° before bottom dead center
  3.    Opens at top dead center and closes at bottom dead center
  4.    May open and close anywhere
 Discuss Question
Answer: Option A. -> Opens at 20° before top dead center and closes at 40° after bottom dead center
Question 165. In a four stroke cycle petrol engine, the inlet valve
  1.    Opens at top dead center and closes at bottom dead center
  2.    Opens at 20° before top dead center and closes at 40° after bottom dead center
  3.    Opens at 20° after top dead center and closes at 20° before bottom dead center
  4.    May open or close anywhere
 Discuss Question
Answer: Option B. -> Opens at 20° before top dead center and closes at 40° after bottom dead center
Question 166. The normal heptane (C₇H₁₆) is given a rating of ________ octane number.
  1.    0
  2.    50
  3.    100
  4.    120
 Discuss Question
Answer: Option A. -> 0
Question 167. In order to eliminate knocking in compression ignition engines, there should be
  1.    Short delay period
  2.    Late auto-ignition
  3.    Low compression ratio
  4.    High self ignition temperature of fuel
 Discuss Question
Answer: Option A. -> Short delay period
Question 168. In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then _________ is employed.
  1.    Fuel pump
  2.    Injector
  3.    Carburettor
  4.    None of these
 Discuss Question
Answer: Option C. -> Carburettor
Question 169. The increase in intake temperature of internal combustion engines will _________ efficiency.
  1.    Have no effect on
  2.    Increase
  3.    Decrease
  4.    None of these
 Discuss Question
Answer: Option C. -> Decrease
Question 170. During idling, a petrol engine requires _________ mixture.
  1.    Lean
  2.    Rich
  3.    Chemically correct
  4.    None of these
 Discuss Question
Answer: Option B. -> Rich

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