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MCQs

Total Questions : 1124 | Page 8 of 113 pages
Question 71. In a typical medium speed 4-stroke cycle diesel engine the inlet valve
  1.    Opens at 20° before top dead center and closes at 35° after the bottom dead center
  2.    Opens at top dead center and closes at bottom dead center
  3.    Opens at 10° after top dead center and closes 20° before the bottom dead center
  4.    May open or close anywhere
 Discuss Question
Answer: Option A. -> Opens at 20° before top dead center and closes at 35° after the bottom dead center
Question 72. Pick up the wrong statement
  1.    2-stroke engine can run in any direction
  2.    In 4-stroke engine, a power stroke is obtained in 4-strokes
  3.    Thermal efficiency of 4-stroke engine is more due to positive scavenging
  4.    Petrol engines occupy more space than diesel engines for same power output
 Discuss Question
Answer: Option D. -> Petrol engines occupy more space than diesel engines for same power output
Question 73. In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to
  1.    Prevent sparking across the gap between the points
  2.    Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 74. The fuel in diesel engine is normally injected at pressure of
  1.    5-10 kg/cm²
  2.    20-25 kg/cm²
  3.    60-80 kg/cm²
  4.    90-130 kg/cm²
 Discuss Question
Answer: Option D. -> 90-130 kg/cm²
Question 75. The self ignition temperature of petrol is _________ as compared to diesel oil.
  1.    Same
  2.    Lower
  3.    Higher
  4.    None of these
 Discuss Question
Answer: Option C. -> Higher
Question 76. Which of the following statement is correct?
  1.    Compression ratio for petrol engines varies from 6 to 10
  2.    Higher compression ratio in diesel engines results in higher pressures
  3.    Petrol engines work on Otto cycle
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 77. The air standard efficiency of an I.C. engine depends on
  1.    Fuel used
  2.    Speed of engine
  3.    Compression ratio
  4.    None of these
 Discuss Question
Answer: Option C. -> Compression ratio
Question 78. Scavenging air in diesel engine means
  1.    Air used for combustion sent under pressure
  2.    Forced air for cooling cylinder
  3.    Burnt air containing products of combustion
  4.    Air used for forcing burnt gases out of engine's cylinder during the exhaust period
 Discuss Question
Answer: Option D. -> Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Question 79. 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
Question 80. The calorific value of gaseous fuels is expressed in terms of
  1.    kcal
  2.    kcal/kg
  3.    kcal/m²
  4.    kcal/m3
 Discuss Question
Answer: Option D. -> kcal/m3

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