Nuclear Power Plant
Uranium-238 is represented by 92U238. What does it represent?
(a) 92 neutrons and 238 protons (b) 92 protons and 238 neutrons
(c) 92 neutrons and 146 protons (d) 92 protons and 146 neutrons
The half-life of radioactive radon
is 3.8 days. The time at the end of which 1/20th of
the Radon sample will remain undecayed will be
(a) 3.8 days (b) 16.5 day (c) 33 days (d) 76 days
Consider the following nuclear fuels:
1. Pu239 2. U235 3. U233 4. Th232
What is the correct
sequence
of the
above
nuclear fuels in order
of increasing half-life?
(a) 1-2-3-4 (b) 1-3-2-4 (c) 2-4-3-1 (d) 4-1-2-3
S.l. unit for radioactivity is
(a) Joule (b) amu (c) Curie (d) Becquerel
What is the function of heavy water in a nuclear reactor?
(a) It serves as a coolant
(b) It serves as a moderator
(c) It serves as a coolant as well as a moderator
(d) It serves as a neutron absorber
The most commonly used moderator in nuclear power plants is
(a) Heavy water (b) concrete and bricks (c) steel (d) graphite
With natural uranium, which of the following is used as moderator?
(a) Heavy water (b) Graphite
(c) Beryllium (d) All the above
Shielding in a nuclear reactor is generally
done to protect against
(a) Excess electrons
(b) X-rays
(c) α-and β-rays (d) neutron and gamma rays
Which one of the following statements is correct?
The
nuclear radiators produced in a reactor,
which must be shielded, are:
(a) Electrons only (b) Alpha, Beta and Gamma rays
(c) Neutrons and Gamma rays (d) Electrons and Gamma rays
Which one of the following pairs of materials is used as moderators in nuclear reactors?
(a) Heavy water and zirconium (b) Zirconium and beryllium
(c) Cadmium and beryllium (d) Beryllium and heavy water.
A nuclear unit becoming critical means:
(a) It is generating power to rated capacity
(b) It is capable of generating power much more than the rated capacity
(c) There is danger
of nuclear spread
(d) Chain reaction that causes automatic
splitting of
the
fuel
nuclei has been established
Which one of the following is correct?
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 a specific value
(c) Reduced to zero
(d) constant
Assertion (A): Pressurized water reactor (PWR) nuclear power plants
use superheated steam.
Reason (R) : An increase in the superheat at constant pressure
increases the cycle efficiency.
(a)
Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Assertion (A):
The thermal
efficiency of a nuclear power
plant using a boiling
water reactor is
higher
than of a plant using a pressurized water reactor.
Reason (R) : In a boiling water reactor, steam is directly allowed to be generated in the reactor itself, whereas in a pressurized water reactor, steam is generated in a separate boiler by heat exchanger device using water of the primary circuit which absorbs the fission energy. (a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Assertion (A): A breeder reactor does not require
moderator.
Reason (R) : The parasite absorption
of neutrons is low.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Enriched uranium is required as 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.
Which one of the following statements is correct?
The mass defect is
(a) A characteristic of certain elements
(b) A term used to prove the relationship between mass and energy of fission energy
(c) A measure
(d) The difference
between mass of the
nucleus and sum of
the
masses
of the nucleons
A sodium graphite reactor uses sodium
(a) As coolant and graphite as moderator
(b) As moderator and graphite as coolant
(c) With graphite as moderator and water as coolant
(d) As moderator and sodium, graphite and water together as coolant
What is the purpose of a moderator in a nuclear reactor?
(a) Moderate the fission temperature
(b) Reduce
the speed of fast moving neutrons
(c) Reduce β and γ rays
(d) Absorb excess neutrons in the reactor
The function of the moderator in a nuclear
reactor is to
(a) stop chain reaction (b) reduce
the speed of the neutrons
(c) absorb neutrons (d) reduce temperature
Consider the following
statements:
1. Breeder reactor produces more plutonium than what it consumes.
2. Zirconium is used as a shield material
3. Lead is the commonly used moderator
Of these, the ones which are not correct will include:
(a) 1, 2 and 3 (b) 1 and 2 (c) 2 and 3 (d) 1 and 3
Which one of the following types of nuclear reactor DOES NOT require a heat exchanger?
(a) Boiling water (b) Pressurized water
(c) Sodium-cooled
(d) Gas-cooled
The boiler used in the Nuclear
Power Station at Tarapur,
is of the
(a) Pressurized water type (b) boiling water type
(c) Gas cooled type (d) liquid metal cooled type
The moderator used in a fast breeder nuclear reactor is
(a) Graphite or liquid sodium
(b) Graphite or beryllium oxide.
(c) Graphite, liquid sodium or beryllium oxide
(d) None of the above
A fast breeder reactor uses which one of the following as fuel?
(a) Thorium
(b) U235 (c) Plutonium (d) Enriched uranium
In fast breeder reactor
(a) the moderator used is water (b) the moderator used is graphite
(c) the moderator used is carbon dioxide
(d) no moderator is used
A nuclear fission is
initiated when the critical energy as compared to neutron binding energy of the
atoms is
(a)
same (b) more (c) less (d) there is no
such criterion
The most practical fuel for
a thermonuclear reactor, both from economical and nuclear consideration is
(a) Plutonium (b)
Uranium (c) Deuterium (d) Thorium
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
The breeding gain in case of
thermal breeder reactor as compared to fast breeder reactor is
(a)
same (b)
lower (c)
higher (d) unity
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
Which of the following
nuclear reactor does not need a heat exchanger for generation of steam?
(a)
gas cooled (b) liquid metal cooled (c) pressurized water (d) boiling water
The commonly used material
for shielding is
(a) lead
or concrete (b)
lead and tin (c) graphite or cadmium (d) thick galvanized sheets
When a reactor becomes
critical, then the production of neutrons is
(a)
infinite (b) zero (c) initiated
(d)
exactly balanced by the loss of neutrons through leakage
A nuclear unit becoming
critical means
(a)
it is generating power to rated capacity
(b)
it is capable of generating much more than rated capacity
(c)
there is danger of nuclear spread
(d) chain
reaction that causes automatic splitting of the fuel nuclei has been
established
The predominant isotope of
the naturally occurring element is
(a)
U₂₃₅ (b) U₂₃₈ (c) Pu₂₃₃ (d) Pu₂₃₉
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
Reflector
in nuclear plants is used to
(a) return the neutrons back
into the core (b) shield the
radioactivity completely
(c) check pollution (d)
conserve energy
The
energy released during the fission of one atom of Uranium 235 in million
electron volts is about
(a) 100 (b) 200 (c)
300 (d)
400
Boiling
water reactor employs
(a) boiler (b) direct
cycle of coolant system
(c) double circuit system of coolant cycle (d)
multi passes system
Thermal Power Plant
In thermal power plants, coal is transferred from bunker to the other places by
(a) Hoists (b) conveyors (c) cranes (d) lifts
The
correct sequence of factors in order of deceasing importance for location of a
thermal power plant is
(a) load, coal, water (b) coal, water, load
(c) Water, load, coal (d) water, coal, load
The efficiency of superheat
Rankine cycle is higher than that of simple Rankine cycle because
(a) The enthalpy of main steam is higher for superheat cycle
(b) The mean temperature of heat addition is higher for superheat cycle
(c) The temperature of steam in the condenser is high
(d) The quality of stem in the condenser is low
In a Rankine cycle, regeneration results in higher efficiency because
(a) Pressure inside the boiler increases
(b)
Heat is added before steam enters the low pressure turbine
(c) Average temperature of heat addition in the boiler increases
(d)
Total work delivered by the turbine increases
For a given set of operating pressure limits of a Rankine cycle, the
highest, efficiency occurs for
(a) Saturated cycle (b) Superheated cycle
(c) Reheat cycle (d) Regenerative cycle.
In steam and other
vapour cycles, the process of removing non-condensable is called
(a) Scavenging process (b) Deaeration process
(c) Exhaust process (d) Condensation process
Consider the following processes:
1. Constant pressure heat addition.
2. Adiabatic compression.
3. Adiabatic expansion.
4. Constant pressure heat rejection.
The correct sequence of these processes in Rankine cycle is:
(a) 1, 2, 3, 4 (b) 2, 1, 4, 3 (c) 2, 1, 3, 4 (d) 1, 2, 4, 3
Assertion (A): Rankine cycle is preferred for waste heat recovery.
Reason (R): Rankine cycle gives high thermal efficiency even at low temperatures compared to other dynamic energy conversion systems
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Consider the
following statements regarding superheating
Rankine Cycles:
1. It reduces the specific steam consumption.
2. It increases the dryness fraction of steam at the exhaust for the same value of condenser pressure.
3. It reduces the cycle efficiency.
Of the these statements
(a) 1 and 2 are correct
(b) 2 and 3 are correct
(c) 1and 3 are correct (d) 1,2 and 3 are correct
Which among the following is the boiler
mounting?
(a) Blow off cock (b) Feed pump (c) Economiser (d) Superheater
Heat is mainly transferred by conduction, convection and radiation in
(a) Insulated pipes carrying hot water
(b) Refrigerator freezer coil
(c) Boiler furnaces
(d)condensation of steam in a condenser
Assertion (A): Fire tube boilers
do not operate at high pressures while water tube boilers operate at high pressures
Reason (R): Due to high temperature of flue gases, fire tubes may fail due to creep.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A (c) A is true but R is false
(d) A is false but R is true
Composed By:
R.Satheesh, M.E., Asso.Prof.,
E-Mail: rsatheeshemail@gmail.com
