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MCQs

Total Questions : 1124 | Page 4 of 113 pages
Question 31. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the
  1.    Exhaust will be smoky
  2.    Piston rings would stick into piston grooves
  3.    Engine starts overheating
  4.    Scavenging occurs
 Discuss Question
Answer: Option D. -> Scavenging occurs
Question 32. 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
Question 33. In a four stroke cycle diesel engine, the exhaust valve
  1.    Opens at 30° before bottom dead centre and closes at 10° after top dead centre
  2.    Opens at 30° after bottom dead centre and closes at 10° before top dead centre
  3.    Opens at bottom dead centre and closes at top dead centre
  4.    May open and close anywhere
 Discuss Question
Answer: Option A. -> Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Question 34. In a diesel engine, the duration between the time of injection and ignition, is known as
  1.    Pre-ignition period
  2.    Delay period
  3.    Period of ignition
  4.    Burning period
 Discuss Question
Answer: Option B. -> Delay period
Question 35. A petrol engine, during suction stroke draws
  1.    Air only
  2.    Petrol only
  3.    A mixture of petrol and air
  4.    None of these
 Discuss Question
Answer: Option C. -> A mixture of petrol and air
Question 36. The thermal efficiency of a petrol engine is _________ as compared to diesel engine.
  1.    Same
  2.    Less
  3.    More
  4.    None of these
 Discuss Question
Answer: Option B. -> Less
Question 37. The mean effective pressure obtained from engine indicator indicates the
  1.    Maximum pressure developed
  2.    Minimum pressure
  3.    Instantaneous pressure at any instant
  4.    Average pressure
 Discuss Question
Answer: Option D. -> Average pressure
Question 38. The accumulation of carbon in a cylinder results in increase of
  1.    Clearance volume
  2.    Volumetric efficiency
  3.    Ignition time
  4.    Effective compression ratio
 Discuss Question
Answer: Option D. -> Effective compression ratio
Question 39. If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is
  1.    V₁ / (V₀ + V₁)
  2.    V₀ / (V₀ + V₁)
  3.    2V₀ / (V₀ + V₁)
  4.    2V₁ / (V₀ + V₁)
 Discuss Question
Answer: Option C. -> 2V₀ / (V₀ + V₁)
Question 40. Which of the following is false statement? Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following
  1.    Piston ring and cylinder wear
  2.    Formation of hard coating on piston skirts
  3.    Oil sludge in the engine crank case
  4.    Detonation
 Discuss Question
Answer: Option D. -> Detonation

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