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MCQs

Total Questions : 347 | Page 5 of 35 pages
Question 41. During suction stroke of a four stroke petrol engine, the inlet valve opens and the charge is sucked into the cylinder as the piston moves upwards from the bottom dead centre.
  1.    True
  2.    False
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 42. The power actually developed by the engine cylinder of an I.C. engine is known as
  1.    theoretical power
  2.    actual power
  3.    indicated power
  4.    none of these
 Discuss Question
Answer: Option C. -> indicated power
Answer: (c).indicated power
Question 43. A nuclear reactor is said to be critical when the neutron population in the reactor core is
  1.    rapidly increasing leading to the point of explosion
  2.    decreasing from the specified value
  3.    reduced to zero
  4.    constant
 Discuss Question
Answer: Option D. -> constant
Answer: (d).constant
Question 44. A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking.
  1.    Yes
  2.    No
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Yes
Answer: (a).Yes
Question 45. A fission chain reaction in uranium can be developed
  1.    by increasing the contents of U235
  2.    by slowing down fast neutrons so that U235 fission continues by slow neutron
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 46. The brake power is the power available
  1.    in the engine cylinder
  2.    at the crank shaft
  3.    at the crank pin
  4.    none of these
 Discuss Question
Answer: Option B. -> at the crank shaft
Answer: (b).at the crank shaft
Question 47. The knocking in diesel engines may be prevented by
  1.    reducing the delay period
  2.    raising the compression ratio
  3.    increasing the inlet pressure of air
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 48. The octane number of petrol, generally available, is
  1.    20 to 40
  2.    40 to 60
  3.    60 to 80
  4.    80 to 100
 Discuss Question
Answer: Option D. -> 80 to 100
Answer: (d).80 to 100
Question 49. In a four stroke cycle diesel engine, the inlet valve
  1.    opens at 20° before top dead centre and closes at 40° after bottom dead centre
  2.    opens at 20° after top dead centre and closes at 20° before bottom dead centre
  3.    opens at top dead centre and closes at bottom dead centre
  4.    may open and close anywhere
 Discuss Question
Answer: Option A. -> opens at 20° before top dead centre and closes at 40° after bottom dead centre
Answer: (a).opens at 20° before top dead centre and closes at 40° after bottom dead centre
Question 50. The loud pulsating noise heard within the cylinder of an internal combustion engine is known as
  1.    detonation
  2.    turbulence
  3.    pre-ignition
  4.    supercharging
 Discuss Question
Answer: Option A. -> detonation
Answer: (a).detonation

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