Power Plant Engineering
A nuclear reactor is said to be critical when the neutron population in the reactor core is

Rapidly increasing leading to the point of explosion
Reduced to zero
Decreasing from the specified value
Constant

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Power Plant Engineering
A pressurized water reactor employs pressurizes for the following application

To provide sub cooled water at high pressure
To maintain constant pressure in primary circuit under varying load
To increase pressure of water in primary circuit
To Supply high pressure steam

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