Answer / rahul ganthade

It depends on whether the field winding of the dc motor is
connected in series or in shunt with the armature
winding.If it is connected in series,the motor will rotate
since the torque,which varies as the product of the
armature and field current is always positive.Thus,a
positive average torque causes the motor to rotate,however
the pulsating nature may cause the commutator segments and
brushes to wear out.
Thus only small sized dc motors may be used with ac supply.

Answer / rafi

Yes, it is possible,

irrespective of ac or dc, the current flowing at any point
of time in the rotor and stator in dc motor will produce
the torque in same direction.

try reversing the polarity of DC supply for a dc motor, it
will rotate in same direction. Applying AC supply is
similar to reversing the supply polarity 50 times in a sec.
so even if you apply AC the motor will run in same
direction.

I hope this clarifies the query

Ferranti Effect says that voltage at the receiving end is higher than that at the sending end. How is it possible?

4 Answers  

---

When in a large power system if the demand of power is larger than the generated power the frequency of the power system drops.(assume the rated frequency is 50Hz and now it is 49Hz) So does this mean the demand is totally supplied with a lower value of generated power in a lower frequency?

1 Answers  

---

3phase 4 wire system is more reliable or 3 phase 3 wire systems?

4 Answers  

---

Anybody tell me about modbus hex address of l&t trivector meter er300p??I want to read voltage,current,kwh etc via rs485...If anybody have a manual then send on my mail..Brijeshmodi18@gmail.Com

0 Answers  

---

Why star point of star connected motor is not grounded? Why alternator is operated at lagging power factor?

3 Answers   TCL,

---

can we use generator(a.c) as a motor.if so how if not why.

2 Answers  

---

what is kondo syatem in eletrical traction

0 Answers   APCPDCL,

---

when we should use Central Battery system and UPS system and why? in other words, what are the differences between the two systems?

1 Answers  

---

What will happen when we connect 2 bulbs in series between 2 phases

7 Answers   Pepsi, PowerTech,

---

What are the different circuits in thermal power plant?

0 Answers  

---

What is the harm if we install primary side 11 KV VCB at a distance of one Km from the 11/3.3KV 12.5 MVA transformer through 11 KV cable.

4 Answers  

---

How to protect a Dosing pumps/any sensitive equipment (single phase) from surge protection inside a food factory.

0 Answers  

---