Mechanical Engineering

Question: A moderator generally used in nuclear power plants is
[A].

graphite

[B].

heavy water

[C].

concrete

[D].

graphite and concrete

Answer: Option D

Explanation:

No answer description available for this question.

Question: A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to
[A].

slow down the speed of fast moving neutrons

[B].

control the reaction

[C].

reduce the temperature

[D].

extract heat from nuclear reaction

Answer: Option A

Explanation:

No answer description available for this question.

Question: A fission chain reaction in uranium can be developed
[A].

by increasing the contents of U235

[B].

by slowing down fast neutrons so that U235 fission continues by slow neutron

[C].

both (a) and (b)

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: An atom bomb utilises uncontrolled nuclear fission.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: Each fission of U235 produces on the average __________ fast neutrons as a product of reaction.
[A].

2.46

[B].

24.6

[C].

246

[D].

2460

Answer: Option A

Explanation:

No answer description available for this question.

Question: In natural uranium, the constituents of three naturally occuring 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%

Answer: Option A

Explanation:

No answer description available for this question.

Question: A power plant giving least running cost of production of electrical power is
[A].

steam power plant

[B].

gas turbine power plant

[C].

hydro electric power plant

[D].

nuclear power plant

Answer: Option D

Explanation:

No answer description available for this question.

Question: Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has
[A].

high neutron absorption cross-section

[B].

low moderating efficiency

[C].

high neutron scatter cross-section

[D].

low neutron absorption cross-section

Answer: Option B

Explanation:

No answer description available for this question.

Question: A nuclear power plant differs from a conventional steam power station only in the steam generating part.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Question: A turbo-jet does not require a turbine to drive the compressor.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.