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MCQs

Total Questions : 347 | Page 6 of 35 pages
Question 51. U233 is produced
  1.    artificially
  2.    as basic raw material
  3.    when thorium is irradiated by neutrons
  4.    by fission of U238
 Discuss Question
Answer: Option C. -> when thorium is irradiated by neutrons
Answer: (c).when thorium is irradiated by neutrons
Question 52. The pressure at the end of compression, in diesel engines, is approximately
  1.    10 bar
  2.    20 bar
  3.    25 bar
  4.    35 bar
 Discuss Question
Answer: Option D. -> 35 bar
Answer: (d).35 bar
Question 53. The detonation is also called knocking or pinking.
  1.    Yes
  2.    No
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Yes
Answer: (a).Yes
Question 54. The energy released during the fission of one atom of Uranium - 235 in million electron volts is about
  1.    100
  2.    200
  3.    300
  4.    400
 Discuss Question
Answer: Option B. -> 200
Answer: (b).200
Question 55. The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.
  1.    Agree
  2.    Disagree
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Agree
Answer: (a).Agree
Question 56. The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called
  1.    mechanical efficiency
  2.    overall efficiency
  3.    volumetric efficiency
  4.    relative efficiency
 Discuss Question
Answer: Option C. -> volumetric efficiency
Answer: (c).volumetric efficiency
Question 57. A moderator generally used in nuclear power plants is
  1.    graphite
  2.    heavy water
  3.    concrete
  4.    graphite and concrete
 Discuss Question
Answer: Option D. -> graphite and concrete
Answer: (d).graphite and concrete
Question 58. The predominent isotope of the naturally occuring element is
  1.    U235
  2.    U238
  3.    Pu233
  4.    Pu239
 Discuss Question
Answer: Option B. -> U238
Answer: (b).U238
Question 59. Nuclear reactors are used
  1.    to produce heat for thermoelectric power
  2.    to produce fissionable material
  3.    to propel ships, submarines, aircrafts
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 60. The exhaust valve in a four stroke cycle petrol engine
  1.    opens at 50° before bottom dead centre and closes at 15° after top dead centre
  2.    opens at bottom dead centre and closes at top dead centre
  3.    opens at 50° after bottom dead centre and closes at 15° before top dead centre
  4.    may open and close anywhere
 Discuss Question
Answer: Option A. -> opens at 50° before bottom dead centre and closes at 15° after top dead centre
Answer: (a).opens at 50° before bottom dead centre and closes at 15° after top dead centre

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