Answer / amit

dc motor winding will be burn.

Answer / pandi

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

Answer / chandan

It depends on the motor construction. If the field winding
is connected in series with the armature winding, the motor
is like a universal motor and will probably operate
normally. If the field winding is connected in parallel with
the armature, the motor will not run, but will draw current,
make noise and get hot.

Answer / empobart jhambt baski

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

Answer / arockia doss

Its quite simple...

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

Answer / vinaykumar

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

Answer / pradeep kumar rawat

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

Answer / mr.anant ram yadav

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.

Answer / manish

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.

Answer / swarupa

In ac supply the magnitude and direction of voltage or
current changes for every half cycles so the dc motor may run
but in very low speed due to less torque develop & also due
to inertia.If it is run continue the frequency losses may
increase due to high heat.The efficiency poor.

why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?

0 Answers   Siemens,

Dear Friends, Need your help for connecting APFC panel, Quotation : I have 2 No’s 1000 KVA Transformers, both transformers are having separate APFC panels, ( Tr-1,400KVAR, TR-2,450 KVAR) Now I want to stop One transformer, present load is 650Amps, Max, So One transformer is enough, I have switched OFF TR-1, but PF is not maintaining properly, its 0.5, So now I want to connect TR-2 APFC also in TR-1 Loads, Can any one answer for my Quotation with drawing, how to connect TR-2 APFC panel in TR-1 Loads,

4 Answers   L&T,

1.wat is the purpose (or)function of regulator? 2.wat is the purpose of stabiliser?

3 Answers  

during positive and negative half cycle of ac supply what happenes in the load?

1 Answers   Siemens, Wipro,

We have one 500KVA transformer. We have tested REF relay and commissioned. After one and half year, due to some ground fault in one of the DB circuit Transformer tripped by REF relay. What will be cause and remedy. Please advise?

1 Answers  

what is neutral ground resistance relay? how it is helpful in protecting system?

5 Answers  

What are locations arc protection relay is fixed.

0 Answers   KSEB, L&T, Siemens,

How to calculate the input cable rating for 10kva ups (3phase input and single phase output and also 3phase output, battery rating 65Ah)provide the formula also.thnx

0 Answers   Bhel,

why transformer are not used in D.C SUPPLY

5 Answers  

How does the sensitive earth fault protection provided by cbct for motor can help in reducing the size of cable used to supply the motor?

1 Answers  

What is the function of retrip in busbar?

0 Answers   Getco,

what we happen if 400 kvar cpacitor banks are on in manual mode and there is no load on mains ??????????????

7 Answers   HCL, Reliance,