Generation of Electrical Energy
The function of a moderator in a nuclear reactor is

To speed up the slow moving electrons
To start the chain reaction
To transfer heat produced inside the reactor to a heat exchanger
To slow down the fast moving electrons

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Generation of Electrical Energy
The draught produced, for a given height of the chimney and given mean temperature of chimney gases

increases with increase in outside air temperature
remains the same irrespective of outside air temperature
may increase or decrease with increase in outside air temperature
decreases with increase in outside air temperature

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