__________ is not used as the control rod material in a nuclear reactor.

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

A

Critical

B

Breeder

C

Fertile

D

Heterogenous

Function of control rod in a nuclear reactor is to control

A

Temperature

B

Pressure

C

Fuel consumption

D

Absorption of neutrons

The main purpose of control rod in a nuclear reactor is to control the

A

chain reaction & hence the power output by regulating the number of secondary neutrons for fission

B

emission of hazardous radiation

C

conversion of fissile material into fertile material

D

velocity of the secondary neutrons

CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the

A

Specific fuel consumption is very low due to the use of heavy water

B

Fuel cost is much lower than that used in pressurised water or boiling water reactor

C

Heavy water is used both as coolant as well as moderator

D

Both B and C

In case of a __________ reactor, the composition in the reactor and at the exit of the reactor is the same.

A

Semi-batch

B

Tubular

C

Batch

D

Back-mix

Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of

A

Concrete

B

Steel

C

Zircalloy

D

Graphite

A nuclear reactor is said to be critical when the neutron population in the reactor core is

A

Rapidly increasing leading to the point of explosion

B

Decreasing from the specified value

C

Reduced to zero

D

Constant

A thermal nuclear reactor compared to a fast breeder reactor

A

Uses slower neutrons for fission

B

Uses faster neutrons for fission

C

Gives higher power density

D

Requires less fuel to run at the same power level

Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium

A

Tin, nickel, iron and chromium

B

And graphite

C

And copper

D

None of these

Which of the following is a moderating material used in nuclear reactor?

A

graphite

B

cadmium

C

zircalloy (an alloy of zirconium and aluminium)

D

stainless steel

__________ is not used as the control rod material in a nuclear reactor.

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