Answer / bharat

In almost all the motors, in starting condition, Armature
current will be very high.

To control that current, starters will be used.

Answer / harish kumar- greenesol

to control the speed of motor through voltage , and to
start smoothly.also some of the cases we can control the
starting current.

Answer / vincent omwikha

.To control the starting current of the motor thus avoiding
overheating of the windings.
.To avoid undervoltage hence tripping of other equipments
on the same line i.e for big motors
.Able to vary the speed of the motor
.Provides different starting/stopping points of the same
motor.
.Provides control measures of overcurrent,earthfault i.e
overload relays,circuit breakers,fuses
.Provides power isolation mechanism when one works on the
motor i.e fuses, breakers, isolators
.Able to know the current taken by the motor i.e ammeters

Answer / mahesh

Normally starter are provided to control & protect the motor during starting & running condition . its help to control the starting current by controlling the voltage & frequency during starting in order to keep the motor winding temperature within the permissible limit.

Answer / parthi

The starter is used to
limit the starting
current of the motor.
The starting time motor
takes high current(5 to
6 times of its rated
current). This high
current damage the
motor windings. So the
starter is essential for
motor.

Answer / mrt

to control the armature(dc motor) or stator(slip ring)
current

How to run 1ph motor(230 VOLTS its full load amps is 4.5 ampa))with 480 volts main(we didn hav neutral)Thn we go for step down transformer.Our load 10 amps,so we conisder this amps in primary are secondary side?

1 Answers  

Explain what is CBCT.

1 Answers  

string efficient is 100% what is the voltage across the each disk?

1 Answers  

If the load is 10Kw and power factor has to improve from 0.5 to 0.8,how can we select the capacitor rating accordingly.Illustrate by showing formula?

9 Answers  

A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?

0 Answers   L&T,

if AVR fails in alternator. what will be the effect.

13 Answers   HP,

the distance from my office to d.g is aprox 400mtrs and voltage drops ibn my office near about 40 volt what should i do p[ls suggest.

4 Answers  

What happens instead of using 3 phase, if we give loop of single phase to all three phases ??

1 Answers  

Why consumers are charged based on Kwh basis why not on Kvah basis.

4 Answers   Unitech,

What is difference between wire and cable ?

3 Answers   Havells,

Is 3C x 2.5 Sqmm Cable can withstand 40Amp Starting current? If Yes then specify your ans.

2 Answers   NTPC,

L.A. (Lightening Arrester) is located at a place from where transmission line enters the transmitting substation. So L.A. (Lightening Arrester) is the first equipments which has to encounter with lightening, high voltage surges and switching surges. It has to absorb energy of lightening, high voltage surges, and switching surges. L.A. (Lightening Arrester) is made up of layers of semiconductors. If these layers can not tolerate energy released by lightening, high voltage surges, and switching surges the L.A. (Lightening Arrester) blasts.

0 Answers