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Chemical Engineering
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Nuclear Power Engineering
Comments
Question
The function of moderators in nuclear reactor is to
Options
A. slow down the secondary neutrons.
B. absorb the secondary neutrons.
C. control the chain reaction.
D. none of these.
Correct Answer
slow down the secondary neutrons.
Nuclear Power Engineering problems
Search Results
1. A moderator __________ the neutrons.
Options
A. slows down
B. absorbs
C. accelerates
D. reflects
Show Answer
Scratch Pad
Discuss
Correct Answer: slows down
2. Which of the following is not an ore of uranium?
Options
A. Pitchblende
B. Kyanite
C. Carnotite
D. Rescolite
Show Answer
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Discuss
Correct Answer: Kyanite
3. Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.
Options
A. equal to
B. less than
C. more than
D. either more or less
Show Answer
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Discuss
Correct Answer: more than
4. The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the
Options
A. fuel cost per unit power generated is less.
B. thermal efficiency of the former is higher.
C. maintenance cost of the former is less.
D. none of these.
Show Answer
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Discuss
Correct Answer: fuel cost per unit power generated is less.
5. A radioactive isotope undergoes decay with respect to time following __________ law.
Options
A. logarithmic
B. exponential
C. linear
D. inverse square
Show Answer
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Discuss
Correct Answer: exponential
6. The
92
U
238
emits an a-particle. The product is
Options
A.
90
U
234
B.
90
U
238
C.
90
U
236
D.
92
U
236
Show Answer
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Discuss
Correct Answer:
90
U
234
7. The ratio of atomic radius to its nuclear radius is about
Options
A. 10
5
B. 10
8
C. 10
12
D. 10
15
Show Answer
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Discuss
Correct Answer: 10
5
8. The time required for half of the __________ of a radioactive isotope to decay is called its half life.
Options
A. nuclei
B. electrons
C. protons
D. neutrons
Show Answer
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Discuss
Correct Answer: nuclei
9. The number of neutrons accompanying the formation of
54
Xe
139
and
38
Sr
94
from the absorption of a slow neutron by
92
U
235
, followed by nuclear fission is
Options
A. 1
B. 2
C. 3
D. 4
Show Answer
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Discuss
Correct Answer: 3
10. Emission of ?-particles during radioactive decay of a substance is from
Options
A. innermost shell
B. nucleus
C. outermost shell
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: nucleus
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