Nuclear Power Engineering
A nuclear reactor can't be used for

None of these
Marine ship propulsion
Supplying intense fields or beams of neutron for scientific experiments
The production of radioisotopes

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Nuclear Power Engineering
A control rod

Both B and C
Is generally made of boron, hafnium or cadmium
Should have small absorption cross-section
Should have large absorption cross-section

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

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