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MCQs

Total Questions : 807 | Page 7 of 81 pages
Question 61. Each fission of U₂₃₅ produces on the average _________ fast neutrons as a product of reaction.
  1.    2.46
  2.    24.6
  3.    246
  4.    2460
 Discuss Question
Answer: Option A. -> 2.46
Question 62. Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has
  1.    High neutron absorption cross-section
  2.    Low moderating efficiency
  3.    High neutron scatter cross-section
  4.    Low neutron absorption cross-section
 Discuss Question
Answer: Option B. -> Low moderating efficiency
Question 63. In triggering fission, which types of neutrons are more effective?
  1.    Fast
  2.    Slow
  3.    In bulk
  4.    Static
 Discuss Question
Answer: Option B. -> Slow
Question 64. 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
Question 65. Pick up the wrong statement
  1.    In a heterogeneous or solid fuel reactor, the fuel is mixed in a regular pattern within moderator
  2.    Slow or thermal neutrons have energy of the order or 0.025 eV
  3.    Fast neutrons have energies above 1000 eV
  4.    Fast reactor uses moderator
 Discuss Question
Answer: Option D. -> Fast reactor uses moderator
Question 66. The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be
  1.    More
  2.    Less
  3.    Same
  4.    Zero
 Discuss Question
Answer: Option B. -> Less
Question 67. A power plant giving least running cost of production of electrical power is
  1.    Steam power plant
  2.    Gas turbine power plant
  3.    Hydro electric power plant
  4.    Nuclear power plant
 Discuss Question
Answer: Option D. -> Nuclear power plant
Question 68. A fast breeder reactor uses
  1.    90% U₂₃₅
  2.    U₂₃₈
  3.    U₂₃₅
  4.    Pu₂₃₉
 Discuss Question
Answer: Option A. -> 90% U₂₃₅
Question 69. Fast breeder reactor uses
  1.    Boiler
  2.    Direct cycle of coolant system
  3.    Double circuit system of coolant cycle
  4.    Multi passes system
 Discuss Question
Answer: Option C. -> Double circuit system of coolant cycle
Question 70. In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be
  1.    Greater than 1.0
  2.    Less than 1.0
  3.    Equal to zero
  4.    Equal to 1.0
 Discuss Question
Answer: Option D. -> Equal to 1.0

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