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Mechanical Engineering · Q69

Power Plant Engineering

Engineering and GATE · Mechanical Engineering · question 69

Q69

U238 will undergo fission by

A.
High energy (fast) neutrons alone
Answer
B.
Low energy (slow) neutrons alone
C.
Either fast or slow neutrons
D.
Medium energy neutrons

Answer: Option A

Solution

Answer: Option A
Solution:
U238 will undergo fission by high energy (fast) neutrons alone.
The much more abundant uranium-238 does not undergo fission and therefore cannot be used as a fuel for nuclear reactors. However, if uranium-238 is bombarded with neutrons it absorbs a neutron and is transformed into uranium-239.
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