Power Plant Engineering MCQ Questions & Answers

61

Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

A) Heavy water B) Graphite C) Carbon dioxide D) No moderator is needed

Discuss

Answer & Solution

Answer: Option D

Solution:

Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel No moderator is needed

62

A fission chain reaction in uranium can be developed by

A) Slowing down fast neutrons so that Uz fission continues by slow motion neutrons B) Accelerating fast neutrons C) Absorbing all neutrons D) Using moderator

Discuss

Answer & Solution

Answer: Option A

Solution:

A fission chain reaction in uranium can be developed by Slowing down fast neutrons so that Uz fission continues by slow motion neutrons

63

The total energy released in fission of U is

A) 5 MeV B) 10 MeV C) 199 MeV D) 168 MeV

Discuss

Answer & Solution

Answer: Option C

Solution:

The total energy released in fission of U is 199 MeV

64

In nuclear fission

A) The original elements change into completely different elements B) The electrons of the element change C) The molecules rearrange themselves to form other molecules D) None of the above

Discuss

Answer & Solution

Answer: Option A

Solution:

Nuclear ﬁssion is a process where the nucleus of an atom is split into two or more smaller nuclei, known as ﬁssion products.
The ﬁssion of heavy elements is an exothermic reaction, and huge amounts of energy are released in the process.

65

The energy required to be applied to a radioactive nucleus for the emission of a neutron is

A) 1 MeV B) 2.4 MeV C) 4.3 MeV D) 7.8 MeV

Discuss

Answer & Solution

Answer: Option D

Solution:

The energy required to be applied to a radioactive nucleus for the emission of a neutron is 7.8 MeV

66

Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal

A) Centrifugal B) Axial C) Reciprocation D) Electromagnetic

Discuss

Answer & Solution

Answer: Option D

Solution:

Electromagnetic type of pump is used in liquid metal cooled reactor for circulation of liquid metal

67

Artificial radioactive isotopes find application in

A) Power generation B) Nucleonic devices C) Nuclear fission D) Medical field

Discuss

Answer & Solution

Answer: Option D

Solution:

Artificial radioactive isotopes are formed when an atom is bombed with an accelerator or exposing it to slow moving neutrons in a nuclear reactor.
Artificial radioactive isotopes find application in Medical field

68

U₂₃₅ will undergo fission by

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

Discuss

Answer & Solution

Answer: Option C

Solution:

U₂₃₅ will undergo fission by either fast or slow neutrons.
For fission of uranium-235, the predominant radioactive fission products include isotopes of iodine, caesium, strontium, xenon and barium.

69

U₂₃₈ will undergo fission by

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

Discuss

Answer & 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.

70

A nuclear unit becoming critical means

A) It is generating power to rated capacity B) It is capable of generating much more than rated capacity C) There is danger of nuclear spread D) Chain reaction that causes automatic splitting of the fuel nuclei has been established

Discuss

Answer & Solution

Answer: Option D

Solution:

A nuclear unit becoming critical means Chain reaction that causes automatic splitting of the fuel nuclei has been established
when the reactor is in a configuration such that one neutron from each atom fissioned causes another fission and then the reactor is said to be critical

Power Plant Engineering MCQ Questions & Answers | Mechanical Engineering