Question { 18196 }

when the rheostat kept in minimum to maximum position in
motors what will happen?

Answer

if resistance is low then flux high,if then speed is low
because N invrsely praportional to flux

Question { L&T, 9903 }

What is the In door to Out door Sub Station.

Answer

Indoor substation is a substation this is constructed in
side the building and this is used below 11kv.
Out door substation is substation this is constructed in
open areas(large areas0.and this is used above 11kv.

Question { Cummins, 13660 }

can a motor acts as a generator

Answer

motor has a stator and rotor.
if the rotor speed is above the synchronous speed it act as
a generator
if it is dc moor, then if you change the supply then it act
as generator

Question { 8166 }

what are the methods of speed control of dc motor???

Answer

somany methods are used
field control,armature resistence

field control method: we add a veriable resistence in
series with fielled winding to control the speed of the
motor.
armature control:we add a veriable resistence in series
with armature winding to control the speed of the motor.

Question { 15130 }

what u meant by shock ? whether it depends on voltage or
current

Answer

when we touch the voltage sourceor any electrical device
then short circuit is formed then current flows in our body
this is called as shock.
shock depends on voltage.
for example : supply shock
ac 220v low
ac 440 high
compare with ac single ph supply dc supply shock is high
because ac 1_ph supply is sinusoidel and dc supply is
stright line.

Question { 7857 }

what is fundamental difference between voltage and current

Answer

voltage is nothing but the force required to move free
electrons from one point to another point and this flow of
free electrons is called current
If voltge high then more free electrons move
from one point to another point so then current is high.

Question { 7346 }

What is eddy current & eddy current loss ?

Answer

In ganerator or motor or trasformar when cunducter cuts
the magnetic flux an emf is induced if closed circut is
formed current is flows in the circut and some amount of
current is flows in the core this current is called eddy
current.
Due to this current heat is developed in the circut due to
this heat some loss in the device this loss is called eddy
current loss.

Question { L&T, 9826 }

Explain briefly about current , voltage and power

Answer

current: the flow of free electrons is called current.
current is flows when closed circuit is formed

voltageis defined as ths force required to move charged
particles(free electrons)from one point to another point.

power:the rate of change of energy is called power>