Nuclear Power Engineering
Pressure in a Pressurised Water Reactor (PWR) is used for

Superheating the steam
Maintaining constant pressure in the primary cooling circuit under varying loads
Pressurising the water in the primary coolant circuit
None of these

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Nuclear Power Engineering
The main purpose of control rod in a nuclear reactor is to control the

Conversion of fissile material into fertile material
Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Velocity of the secondary neutrons
Emission of hazardous radiation

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