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

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

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Generation of Electrical Energy
In a regenerative surface condenser

There is one pump to remove air and condensate
There are two pumps to remove air and condensate
There is no pump; the condensate gets removed by gravity
There are three pumps to remove air, vapor and condensate

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