Power Plant Engineering MCQ Questions & Answers

91

Nuclear reactors are used

A) To produce heat for thermoelectric power B) To produce fissionable material C) To propel ships, submarines, aircrafts D) All of these

Discuss

Answer & Solution

Answer: Option D

Solution:

Nuclear reactors are used
To produce heat for thermoelectric power
To produce fissionable material
To propel ships, submarines, aircrafts

92

The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is

A) Same B) Lower C) Higher D) Unity

Discuss

Answer & Solution

Answer: Option B

Solution:

The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is lower.
Breeder reactors are also fast reactors. Fast neutrons are ideal for plutonium production because they are easily absorbed by U₂₃₈ to create Pu₂₃₉ and they cause less fission than thermal neutrons.

93

The energy produced by a thermal reactor of same size as a breeder reactor is

A) Almost same B) Slightly more C) Slightly less D) Much less

Discuss

Answer & Solution

Answer: Option D

Solution:

The energy produced by a thermal reactor of same size as a breeder reactor is much less

94

In natural uranium, the constituents of three naturally occurring isotopes are

A) U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282% B) U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282% C) U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712% D) U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%

Discuss

Answer & Solution

Answer: Option A

Solution:

In natural uranium, the constituents of three naturally occurring isotopes are U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%.

95

The main interest of shielding in nuclear reactor is protection against

A) X-rays B) Infrared rays C) Neutrons and gamma rays D) Electrons

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

96

Ferrite material is

A) The most fissionable material B) The basic fuel for nuclear paints C) Basic raw material for nuclear plants D) The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

Discuss

Answer & Solution

Answer: Option D

Solution:

Fertile material is a material that although not itself fissionable by thermal neutrons, can be converted into a fissile material by neutron absorption and subsequent nuclei conversions.

97

Enriched uranium may contain fissionable contents of the order of

A) 1-99% B) 1-25% C) 1-50% D) 1-75%

Discuss

Answer & Solution

Answer: Option A

Solution:

Natural uranium is 99.284% 238U isotope, with 235U only constituting about 0.711% of its mass. 235U is the only nuclide existing in nature (in any appreciable amount) that is fissile with thermal neutrons.

98

A reactor capable of converting a ferrite material into fissile isotopes is called

A) Regenerative reactor B) Fast breeder reactor C) Breeder reactor D) Boiling water reactor

Discuss

Answer & Solution

Answer: Option A

Solution:

A reactor capable of converting a ferrite material into fissile isotopes is called Regenerative reactor

99

In the breeder reactors the generation of new fissionable atom is

A) At the lower rate than the consumption B) At a higher rate than the consumption C) At an equal rate of the consumption D) Depends on other considerations

Discuss

Answer & Solution

Answer: Option B

Solution:

In the breeder reactors the generation of new fissionable atom is at a higher rate than the consumption
It converts this isotope into fissionable uranium-233, which is capable of creating a chain reaction.

100

The nuclear radiators produced in a reactor which must be shielded are

A) Electrons B) $$\alpha ,\,\beta $$ and $$\gamma $$ rays C) Neutron and gamma rays D) None of these

Discuss

Answer & Solution

Answer: Option C

Solution:

The nuclear radiators produced in a reactor which must be shielded are Neutron and gamma rays.

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