The control rods in the control system of nuclear reactors are used to

A Absorb excess neutrons
B Control fuel consumption
C Control temperature
D All of these

Correct Answer: Absorb excess neutrons

Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.
Bissoy MCQ
#Mechanical Engineering #Power Plant Engineering

Related Questions

A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are
A Equal in size
B Of different sizes
C Of such size that the ratio of their volumes is
D None of these
Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of
A High carbon steel
B Molybdenum
C Zircalloy
D Boron or cadmium
three meauring rods are 64 cm, 80 cm and 96 cm in length, What is the least length of cloth that can be measured exact number of times using any one of these rods ?
A 9.60 m
B 8,0 m
C 9.60 cm
D 96m
Three measuring rods are 64 cm, 80 cm and 96 cm in length. what is the least length of cloth that can be measured exact number of times using any one of these rods?
A 9.60 m
B 8.0 m
C 9.60 cm
D 96 m
The sensing element in the control system of nuclear reactors measures the _________ of the neutron flux in the reactor.
A Temperature
B Volume
C Density
D None of these
The function of control rods in nuclear plants is to
A Control temperature
B Control radioactive pollution
C Control absorption of neutron
D Control fuel consumption
The graphite rods in the nuclear reactor
A react with U to release energy
B produce neutrons
C undergo combustion which triggers the nuclear fission
D convert fast moving neutrons into thermal neutrons
Which is the most commonly used molten metal for cooling of nuclear reactors?
A Zinc
B Sulphur
C Sodium
D Manganese
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher
A Melting point, hence can be subjected to higher temperature
B Density ; hence core volume for a given power output would be smaller
C Resistance to effects of irradiation
D All of the above
Heavy water used in the nuclear reactors to slow down the speed of neutrons is
A Highly purified water
B A compound of oxygen and deuterium
C Water having dissolved salts of heavy metals
D None of these

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