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A School organised an educational tour t...

A School organised an educational tour to two places. First one was to a thermal power station and the `2^(nd)` to a factory of dry cells
The engineer at the power station explained to the students how electric power is generated and transmitted to the city .
The manager at the dry cell factory , took the students to the factory and explained them the importance of dry cells in our daily life.'
Which of the following statements are true ??

A

dc voltage can be stepped up or down

B

ac voltage can be stepped up or down

C

both of them can be stepped up or down

D

neither of them will be stepped up or down

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