Answer / jude finney

speed of the motor can be varied in two methods
1)by armature voltage control method
2)by field voltage control method

Answer / m raviteja

by varying the armature resistance and field resistance

Answer / uma

speed of dc motor can be varied by using v/f control. that
is either by changing the armature voltage or frequency.

Answer / akhilesh

Please use DC Drive

Answer / hm

@ uma : What is the concept of frequency in DC supply ??

dc motor speed can be varried by
1. armature voltage control
2. field flux control

also u can control speed by PWM (Pulse Width Modulation) by
varying the duty cycle.

Answer / ganguly

there are two types of speed control for dc motor

1. armature control method
by connecting the additional resistance to the armature,
but this will use below rated seeds only
2.field controlmethod
by connecting the resistance to the field
but this will use above rated speeds only

In a star-star connected h.t transformer why we use NGR on the secondary (l.t)side.

3 Answers   Star, TATA,

Why, the starting current of 3 phase Induction Motor is 7 to 8 times its rated current?

9 Answers   L&T,

I had applied for JE in PSEB, Can you pls send me the Question bank for related to my field

0 Answers  

what is the differance between MC61C and MC61A relay of L &T make.

1 Answers   BARC,

how to calculate the multiplication factor in HT incomer trivector meters

9 Answers   Dalkia, Getco, Gujarat Energy Transmission Corporation Limited GETCO,

why we step down the voltage from 440 to 220 in machines

4 Answers  

trasnfarmaer core make

0 Answers   MPSEB,

how can alculate the apfc panel rating?

3 Answers  

Dear,  How much ph is maintained of water electrolite used in lrs for slipring induction motor ?

1 Answers  

iam using DM 3251 voltmeter(1 percent accuracy)for 11KV system PT ratio is 11KV/110V.can anybody explain what is the max and min voltage deviation.

0 Answers  

What is an alternator impedance value?

0 Answers   Orchid,

Please tell me the formulaes while designing a substation for power Calculations in designing a 33 KV Substation?????

0 Answers