DGVCL Exam Paper (12-06-2016)
The main advantage of AC over DC is:

AC is easy to maintain & can be easily distributed at long distances
AC can be easily converted into DC by using a rectifier
All of these
Conversion flexibility from one voltage level to other

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DGVCL Exam Paper (12-06-2016)
A Step Up transformer :

(a) and (b) only
Step up the level of Frequency
Steps up the level of Voltage
Steps down the level of current

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