dc motor winding will be burn.

When ac supply is ginen to DC motor, DC motor will run with 
less speed and prodeced some noice.

AC apply to DCmotor frequency dependent losses increse 
(eddycurrent&core)losses
motor gives less output

if A.c supply given to D.c motor more spark at brush & run 
at low speed with noise

if A.c. supply given to D.c. motor the net torqe will be 
zero and motor will not work. bez postive &negative cycle 
is zero.

The Motor will run only on the positive side of the Ac 
wave .so it will run and stop then run again and stop again.
but if the volume of the AC is high, then the winding will 
be burned due to the high frequency exposed to

it will run at very low speed and excessive heat is 
produced in the motor due high hysterisis and eddy current 
losses and along run may damage the motor

the motor wil not run

Its quite simple...

Motor Will run with reduce speed & With Humming noise Comes 
with Steps of jerk.

I want to know what is exactly the answer of this question?

dc motor does no work on ac.it will not rotate because in 
india ac frequency is 50 hz so the time of half cycle is 
only 10 ms.this time is too short to move because of its 
inertia.


but expeptionaly dc series motor will rotate when it is 
given to ac supply.