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

To start the chain reaction
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

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Generation of Electrical Energy
The effect of considering friction losses in steam nozzle for the same pressure ratio leads to

decrease in exit velocity from the nozzle
increase in exit velocity from the nozzle
no change in exit velocity from the nozzle
increase or decrease depending upon the exit quality of steam

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