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

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

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Generation of Electrical Energy
In a regenerative surface condenser

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

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