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

When can we take Neutral as common neutral link?

0 Answers  

PLZ EXPLIN ABOUT CLASS PS CLASS CT .WHY THEY R DESINED AND FOR WHAT PURPOSE?WHY OTHER CT CANT BE USED AS PS CLASS CT? EXPLAIN IN SIMPLE LAUNGAGE IF POSSIBLE PLZ GIVE CIRCIT DIAGRAM?EMAIL-RAJ_SINGH_0376@SIFY.COM

0 Answers   ABB,

we have one 75kw motor 380 volt 3ph amp134 please advise which size of cable required

2 Answers  

Why we use DC for charging of Batteries??Why not AC Supply???

6 Answers   Emerson, Infosys,

What is the need for checking knee point voltage for CT's?

1 Answers  

what is the length of air terminal in lightening arrester system.

1 Answers  

which theorem is used to analyse fault a)thevinin b)Norton c)Superposition d)jordan

1 Answers   FFC, NTS,

What is Engine?

6 Answers   HSL,

Whats the diference between Induction motor and servo motor

3 Answers   Essar, PMT Machines,

How to calculate that clean water supply in one Day from 150 KLD STP?

0 Answers  

Differentiate between kirchhoff’s first law and kirchhoff’s second law?

0 Answers  

Explain and give examples about VCB?

0 Answers   AZ Engineering, Vodafone,