Answer / iamdon

Large rated alternators are of rotating field type where as
DC genertors are of rotating armature type.The basic reason
behind different choice of arrangements is governed by
following factors.
INSULATION in the case of alternator and
COMMUTATION in the case of DC generator.

In the case of large alternators, more insulation is
required for large voltage generated in armature
winding.Being armature placed on stator,it is easier to
provide insulation for the stationary armature winding.Also
armature is placed on radially outer side, so we can put
more and more insulation(if required for higher voltage)in
the space avaliable.

In the case of DC generators,AC is generated in the
armature winding which is converted into DC, by means of
mechanical rectifier i.e, commutator.It is convenient to
adopt rotating commutator and fixed brush ararrangement for
collecting DC through brushes.So we need to place armature
winding on the rotor.

Author:arbelectbit@yahoo.com

i have a wire.and the current flowing in that.when we cut the wire then why dont we seen the elactrons....

8 Answers   GM General Motors,

---

What can you contribute to the progress of our Company as an employee if you are selected?

0 Answers  

---

some time we open engine breaker 8.0 MW load but plant not trip. and another time engine open 4.0 MW load engine trip why? individually engine breaker open & individually emergency stop why difference?

0 Answers  

---

which motors is used in mixies

3 Answers  

---

Why Parallel operation of two Transformer are Required?

6 Answers  

---

In EB metering we face problem kva jump even in no load condition.can any one help to control this

0 Answers  

---

All the socket in a room become very hot, the Wall was also became very hot and the earth conductor also became live, what in your view might be the possible causes?

0 Answers  

---

What is relation between transmission lines & Communication lines ?

0 Answers   NTPC,

---

What is the field weakening mode of a ac motor?

1 Answers   L&T,

---

Which is is best option for 33 kv line incomer.I am Desinging the panel for new projects and i would like to get Your opinion on this Vcb or sf6. Please help me with your replies. Thanks D p singh

6 Answers  

---

please give me solution to rectify the emi(electromagnetic interference)

0 Answers   Powergear,

---

What is the reason behind current flow(20 A) in amain earth cable of an SMDB? Is cuurent flow(45A etc) through a neutral cable acceptable?

0 Answers  

---