Nuclear Power Engineering
Heavy water used in the nuclear reactors to slow down the speed of neutrons is

Water having dissolved salts of heavy metals
Highly purified water
None of these
A compound of oxygen and deuterium

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

It is difficult to control fusion reaction
It is difficult to initiate fusion reaction
Quantity of fuel required for initiating fusion reaction is prohibitively high
The fuel required (e.g. deuterium and tritium) is scarce

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