Nuclear Power Engineering
The atomic mass of an element is fractional, because

It may have isotopes
It may have isobars
It contains neutrons
Of uncertainty principle

ANSWER DOWNLOAD EXAMIANS APP

Nuclear Power Engineering
In a pressurised water reactor (PWR), the

Coolant water boils in the core of the reactor
Use of moderator is not required
Fuel is natural uranium and heavy water acts both as moderator & coolant
Coolant water is pressurised to prevent bulk boiling of water in the core

ANSWER DOWNLOAD EXAMIANS APP