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Quiz 4
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Q.1
In the breeder reactors the generation of new fissionable atom is
At the lower rate than the consumption
At a higher rate than the consumption
At an equal rate of the consumption
Depends on other considerations
Q.2
The nuclear radiators produced in a reactor which must be shielded are
Electrons
α, β and γ rays
Neutron and gamma rays
None of these
Q.3
A moderator generally used in nuclear power plants is
Graphite
Heavy water
Concrete
Graphite and concrete
Q.4
The primary fuel used in nuclear power plants is
U₂₃₅
U₂₃₈
Pu₂₃₉
Pu₂₃₃
Q.5
The secondary fuel used in nuclear power plants is
U₂₃₃ and Pu₂₃₉
U₂₃₅ and Th₂₃₂
U₂₃₅ and Pu₂₃₈
U₂₃₃ and Pu₂₃₈
Q.6
Boiling water reactor employs
Boiler
Direct cycle of coolant system
Double circuit system of coolant cycle
Multi passes system
Q.7
Ideally the neutron flux in reactor should be
Maximum in centre and zero at side
Maximum at side and zero in canter
Uniform throughout
Zero throughout
Q.8
Breeder reactors employ liquid metal coolant because it
Acts as good moderator
Produces maximum steam
Transfers heat from core at a fast rate
Breeds neutrons
Q.9
A pressurized water reactor employs pressurizes for the following application
To maintain constant pressure in primary circuit under varying load
To Supply high pressure steam
To increase pressure of water in primary circuit
To provide sub cooled water at high pressure
Q.10
Moderator in nuclear plants is used to
Reduce temperature
Extract heat from nuclear reaction
Control the reaction
Cause collision with the fast moving neutrons to reduce their speed
Q.11
Reflector in nuclear plants is used to
Return the neutrons back into the core
Shield the radioactivity completely
Check pollution
Conserve energy
Q.12
The presence of reflector in nuclear power plants results in
Increased production of neutrons
Complete absorption of neutrons
Controlled production of neutrons
Decreased leakage of neutrons
Q.13
Half life of a radioactive isotope corresponds to the time required for half of the following to decay
Electrons
Protons
Neutrons
Atom
Q.14
When a reactor becomes critical, then the production of neutrons is
Infinite
Zero
Exactly balanced by the loss of neutrons through leakage
Initiated
Q.15
The energy released during the fission of one atom of Uranium 235 in million electron volts is about
100
200
300
400
Q.16
Plutonium is produced
As basic raw material
By neutron irradiation of Uz
By neutron irradiation of thorium
Artificially
Q.17
In triggering fission, the following types of neutrons are desirable
Fast moving
Slow moving
Critical neutrons
Neutrons at rest
Q.18
The following present serious difficulty in designing reactor shield
Alpha particles
Beta particles
Thermal neutrons
Fast neutrons and gamma rays
Q.19
Uranium has isotopes
U₂₃₄
U₂₃₅
U₂₃₈
All of these
Q.20
The most commonly used moderator in nuclear plants is
Heavy water
Concrete and bricks
Graphite and concrete
Graphite
Q.21
Breeder reactor has a conversion ratio of
Unity
More than unity
Less than unity
Zero
Q.22
Hydrogen is preferred as better coolant in comparison to CO₂ because former
Is lighter
Is inert
Has high specific heat
Is a good conductor
Q.23
In nuclear fission each neutron that causes fission releases
No new neutron
At least one new neutron
One new neutron
More than one new neutron
Q.24
The function of control rods in nuclear plants is to
control temperature
control radioactive pollution
control absorption of neutron
control fuel consumption
Q.25
Reactors designed for propulsion applications are designed for
enriched uranium
natural uranium
pure uranium
any type of uranium
Q.26
The value of the reheat factor is of the order of
0.8 to 1.0
1.0 to 1.05
1.1 to 1.5
above 1.5
Q.27
Binary vapor cycles are used to
Increase the performance of the condenser
Increase the efficiency of the plant
Increase efficiency of the turbine
None of the above
Q.28
Parson's turbine is
pressure compounded steam turbine
simple single wheel, impulse steam turbine
simple single wheel reaction steam turbine
multi wheel reaction steam turbine
Q.29
Breeder reactors employ liquid metal coolant because it
transfers heat from core at a fast rate
produces maximum steam
acts as good moderator
increases rate of reaction in core
Q.30
Boiling water reactor employs
single circuit system
multi pass system
direct cycle of coolant system
double circuit system of coolant cycle
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