41. Hydrogen is preferred as better coolant in comparison to C02 because former
(a) is lighter
(b) is inert
(c) has high specific heat
(d) is a good conductor
(e) all of the above
Ans: c
42. 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
Ans: a
43. The risk of radioactive hazard is greatest in the turbine with following reactor
(a) pressurized water
(b) boiling water
(c) gas cooled
(d) liquid metal cooled
(e) all of the above
Ans: b
44. Plutonium is produced
(a) as basic raw material
(b) by neutron irradiation of Uz
(c) by neutron irradiation of thorium
(d) artificially
(e) in high capacity furnace
Ans: b
45. Electron-volt is the unit of
(a) atomic power
(b) energy
(c) voltage
(d) radio activity
(e) there is no such unit
Ans: b
46. 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 vapor pressure.
Ans: d
47. The unit of radio-activity is
(a) electron-volt
(b) electron-ampere
(c) curie
(d) MeV
(e) AMU
Ans: c
48. Pick up the wrong statement Fast breeder reactors
(a) operate at extremely high power densities.
(b) are liquid-metal cooled
(c) produce more fuel than they consume
(d) are unmoderated
(e) use water as coolant
Ans: e
49. Uranium-233 is produced
(a) as basic raw material
(b) by neutron irradiation of Uz
(c) by neutron irradiation of thorium
(d) artificially
(e) in high capacity furnaces
Ans: c
50. Plutonium-239 is produced
(a) as basic raw material
(b) by neutron irradiation of IT
(c) by neutron irradiation of thorium
(d) artificially
(e) in high capacity furnaces
Ans: b
51. 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
Ans: d
52. Which of the following is the primary fuel
(a) Ulii
(b) U
(c) U238
(d) Pu:
(e) Pu
Ans: b
53. Which of the following is secondary fuel
(a) Th232andU238
(b) U233andPu239
(c) U233andPu238
Ans: c
54. A pressurized water reactor employs pressurizer 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
(e) all of the above
Ans: a
55. Which of the following can be used as a coolant in nuclear plant
(a) light or heavy water
(b) molten lead
(c) carbon dioxide
(d) freon
(e) carbon tetrachloride
Ans: a
56. Reactors for propulsion applications use
(a) natural uranium
(b) molten lead
(c) any form of uranium
(d) thorium
(e) plutonium
Ans: b
57. 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
(e) none of the above
Ans: c
58. Breeder reactors employ liquid metal coolant because it
(a) acts as good moderator
(b) produces maximum steam
(c) transfers heat from core at a fast rate
(d) breeds neutrons
(e) increases rate of reaction in core
Ans: c
59. In triggering fission, which type of neutrons are more effective
(a) fast
(b) slow
(c) in bulk
(d) static
(e) activated
Ans: b
60. For economical operation of a nuclear plant
(a) used fuel should be reprocessed
(b) moderator should be used
(c) coolant should be employed
(d) control rods should be used
(e) reflector should be used
Ans: a