OBJECTIVE TYPE QUESTIONS

1. POWER PLANT ENGINEERING
QUIZ – II
1. Which of the following fuel material occurred naturally?
a. U235
b. Pu239
c. Pu241
d. U-233
2. The function of a moderator is to
a. absorb the part of the Kinetic energy of the neutrons
b. extract the heat
c. reflect back some of the neutrons
d. start the reactor
3. Which of the following is not used as moderator?
a. water
b. heavy water
c. graphite
d. boron
4. When the control rods are inserted into the reactor, K (Multiplication factor) becomes
a. 0
b. ˃1
c. 1
d. <
5. The function of coolant is to
a. extract heat from reactor
b. slow down neutrons
c. control the reaction
d. reflect the neutrons
6. Which of the following has highest moderating ratio?
a. D2O
b. H2O
c. Carbon
d. Helium
7. The reactor performs the following function as that of _____ in a steam power plant.
a. furnace
b. turbine
c. electric generator
d. boiler
8. In pressurized water reactor
a. light water is used as coolant
b. light water is used as coolant and moderator
c. heavy water is used as coolant
d. heavy water is used as coolant and moderator
9. In which of the following reactors, heat exchanger is not used?
a. Pressurized water reactor
b. Boiling water reactor

2. c. CANDU reactor
d. Gas cooled reactor
10. In Canadium Deuterium Uranium reactor (CANDU), heavy water is used as
a. Moderator
b. Coolant
c. Neutron reflector
d. All of the above
11. In Canadium Deuterium Uranium reactor (CANDU), the control rods are made of
a. Cadmium
b. Boron steel
c. Graphite
d. Beryllium
12. Gas cooled reactors are _____ moderated.
a. Light water
b. Heavy water
c. Graphite
d. Beryllium
13. In Sodium-Graphite reactor, sodium is used as
a. Coolant
b. Moderator
c. Reflector
d. All of the above
14. In which of the following, an intermediate heat exchanger is used
a. Pressurized water reactor
b. Boiling water reactor
c. Gas cooled reactor
d. Liquid metal cooled reactor
15. Moderator is not required in
a. Pressurized water reactor
b. Gas cooled reactor
c. Boiling water reactor
d. Breeder reactor
16. Isotopes ofsame elements have
(a) same atomic number and different masses
(b) same chemical properties but different atomic numbers
(c) different masses and different atomic numbers
(d) different chemical properties and same atomic numbers
(e) same chemical properties and same atomic numbers.
17. The total energy released in fission of U is
(a) 5 MeV (b) 10 MeV (c) 199 MeV (d) 168 MeV (e) 11 MeV.
18. One gram of uranium will produce energy equivalent to approximately
(a) 1 tonne of high grade coal (b) 4.5 tonnes of high grade coal (c) 10 tonnes of high grade
coal (d) 100 tonnes of high grade coal (e) 10
19. Breeder reactor has a conversion ratio of

3. (a) unity (b) more than unity (c) less than unity (d) zero (e) infinity.
20. The number of isotopes ofhydrogen are
(a) 1 (b) 2 (c) U (c) 3 (e) 0
21. The commonly used material for shielding is
(a) lead or concrete (b) lead and tin (c) graphite or cadmium (d) thick galvanised sheets (e)
black carbon papers.
22. The energy required to be applied to a radioactive nucleus for the emission of a
neutron is
(a) 1 MeV (b) 2.4 MeV (c) 4.3 MeV (d) 7.8 MeV (e) 20 MeV.
23. Which of the following are ferrite materials
(a) U233andPu239 (b) U (c) U238andPu239 (d) U238andTh239 (e) none of the above
24. Ferrite material is
(a) the most fissionable material
(b) the basic fuel for nuclear paints
(c) basic raw material for nuclear plants
(d) the material which absorbs neutrons and undergoes spontaneous changes leading to the
formation of fissionable material
(e) none of the above.
25. Enriched uranium is one in which
(a) %age of U235 has been artificially in-creased
(b) %age of U has been artificially increased
(c) %age of U234 has been artificially in-creased
(d) extra energy is pumped from outside
(e) all impurities have been removed.
26. In fast breeder reactors
(a) any type of moderator can be used
(b) graphite is used as the moderator
(c) heavy water is used as the moderator
(d) moderator may or may not be used
(e) moderator is dispensed with.
27. In nuclear fission each neutron that causes fission releases
(a) no new neutron
(b) at least one new neutron
(c) one new neutron
(d) more than one new neutrons
(e) many-fold neutrons.
28. Gas cooled reactor uses following materials as moderator, and coolant
(a) graphite, C02 (b) graphite, air (c) heavy water, C02 (d) lead, H2 (e) concrete, N2.

4. 29. A nuclear fission produces energy of following order in MeV
(a) 20 (b) 200 (c) 2000 (d) 20,000 (e) 2 x 105.
30. Ideally the neutron flux in reactor should be
(a) maximum in center and zero at side
(b) maximum at side and zero in center
(c) uniform throughout
(d) zero throughout
(e) none of the above.
31. Enriched uranium may contain fissionable contents of the order of
(a) 1-99% (b) 1-25% (c) 1-50% (d) 1-75% (e) 1-90%.
32. Natural uranium is made up of
(a) 99.282% U238, 0.712% U235, 0.006% U234
(b) 99.282% U235, 0.712% U238, 0.06%' U234
(c) 99.282% U234, 0.712% U238, 0.006% U235
(d) 99.282% U235, 0.712% U234, 0.006% U238
(e) none of the above.
33. The risk of radioactive hazard is greatest in the turbine with following reactor
(a) pressurised water (b) boiling water (c) gas cooled (d) liquid metal cooled (e) all of the
above.
34. Plutonium is produced
(a) as basic raw material (b) by neutron irradiation of Uz (c) by neutron irradiation of throium
(d) artificially (e) in high capacity furnace.
35. Pick up the wrong statement
(a) In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within
moderator.
(b) Slow or thermal neutrons have energy of the order or 0.025 eV
(c) Fast neutrons have energies above 1000 eV
(d) Fast reactor uses moderator
(e) Most serious drawback in using water as coolant in nuclear plants is its high vapour
pressure.
36. The unit of radio-activity is
(a) electron-volt (b) electron-ampere (c) curie (d) MeV (e) AMU.
37. Which of the following type of pump is used in liquid metal cooled reactor for
circulation of liquid metal
(a) centrifugal (b) axial (c) reciprocation (d) electromagnetic (e) diaphragm.
38. A pressurised water reactor employs pressuriser for the following application
(a) to maintain constant pressure in primary circuit under varying load
(b) to Supply high pressure steam
(c) to increase pressure of water in primary circuit
(d) to provide subcooled water at high pressure

5. (e) all of the above.
39. The efficiency of a nuclear power plant in comparison to conventional and nuclear
consideration is
(a) higher cost of nuclear fuel
(b) high initial cost
(c) high heat rejection in condenser
(d) lower temperature and pressure conditions
(e) nuclear hazard risk.
40. Apparatus that liquefies helium is in a laboratory at 296 K. The helium in the
apparatus is at 4.0 K. If 150 mJ of heat is transferred from the helium, find the
minimum amount of heat delivered to the laboratory.
a. 10 J
b. 11 J
c. 13 J
d. 12 J
41. An ideal gas undergoes an isothermal expansion at 77ºC increasing its volume from
1.3 to 3.4 L. The entropy change of the gas is 24 J/K. How many moles of gas are
present?
a. 3. 00 mol
b. 2. 00 mol
c. 1. 00 mol
d. 4. 00 mol
42. A balloon filled with gas expands its volume by 2.0 L. If the pressure outside the
balloon is 0.93 bar and the energy change of the gas is 450 J, how much heat did the
surroundings give the balloon?
a. 1290 K
b. 1500 K
c. 1600 K
d. 1700 K
43. When 100 kJ of work is done on a closed system during a process, the total energy of
the system increases by 55.0 kJ. Calculate how much heat is either added or removed
from the system?
a. – 45 kJ
b. – 32 kJ
c. – 23 kJ
d. – 33 kJ
44. A piston-cylinder device initially contains air at 150 kPa and 27°C. At this state, the
volume is 400 litres. The mass of the piston is such that a 350 kPa pressure is required
to move it. The air is now heated until its volume has doubled. Determine the total heat
transferred to the air.
a) 747 kJ
b) 757 kJ
c) 767 kJ
d) 777 kJ

6. 45. An ideal heat engine operates between two temperatures 600 K and 900 K. What is
the efficiency of the engine?
(A) 50% (B) 80% (C) 100% (D) 10% (E) 33%
46. A cylinder contains 5 m3 of an ideal gas at a pressure of 1 bar. This gas is
compressed in a reversible isothermal process till its pressure increases to 5 bar. The
work in kJ required for the process is
(A) 804.7
(B) 953.2
(C) 981.7
(D) 1012.2
47. According to which law, all perfect gases change in volume by l/273th of their
original volume at 0°C for every 1°C change in temperature when pressure remains
constant
(a) Joule’s law (b) Boyle’s law (c) Regnault’s law (d) Gay-Lussac law (e) Charles’ law
48. At a constant temperature, an ideal gas is compressed from 6.0 liters to 4.0 liters by
a constant external pressure of 5.0 atm. How much work is done on the gas?
(a) w = +10 liter atm
(b) w = -10 liter atm
(c) w = +30 liter atm
(d) w = -30 liter atm
(e) The answer cannot be calculated.
49. A systemsuffers an increase in internal energy of 80 J and at the same time has 50 J
of work done on it. What is the heat change of the system?
(a) +130 J
(b) +30 J
(c) -130 J
(d) -30 J
(e) 0 J
50. A perfect gas at 27 °C is heated at a constant pressure till its volume is double. The
final temperature is
a. 54 °C
b. 327 °C
c. 108 °C
d. 654 °C
e. 600 °C