Answer Posted / kantesh acharya

The AC motor will start to turn, then stop.

This is because AC motors are designed to create a magnetic
field, that starts the armature rotating.

Then the polarity switches, moving the magnetic field ahead
so the armature follows it.

DC power obviously doesn't reverse polarity so the armature
catches up to the field and stops.

I should mention there are different types of AC motor, and
my description doesn't cover all types.

Read more:
http://wiki.answers.com/Q/What_will_happen_if_you_give_DC_supply_to_a_AC_motor#ixzz1OxYfDEOf

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