449. Plutonium is produced
A.As basic raw material
B.By neutron irradiation of U238
C.By neutron irradiation of throium
D.Artificially

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450. Electron-volt is the unit of
A.Atomic power
B.Energy
C.Voltage
D.Radio activity

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451. 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 circut
D.To provide subcooled water at high pressure

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452. 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

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453. Reactors for propulsion applications use
A.Natural uranium
B.Molten lead
C.Any form of uranium
D.Thorium

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454. The function of control rods in nuclear plants is to
A.Control temperature
B.Control readioactive pollution
C.Control absorption of neutron
D.Control fuel consumption

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455. 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

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