Answer / sanjeet swarnakar

to limit the starting current ,because the resistance of
armature is very less so starting current becomes four to
five times . so to save the motor starter is used

Answer / satish kumar .g

motor can't start at high current so we use starter to
increase the current rapidly to motor.Then motor fix up the
high current and start rotate

Answer / k.delip kumar

IF SUUDEN FLOW OF CURRENT IN AN ac or dc MOTER THE WINDINGS
MAY GET DAMEGED SO TO OVERCOME THIS STARTER IS A TECNOLOGY
TO REDUCE THE STARTIN CUREENT

Answer / irfanullah

Basically we know that current is divided in parallel network .in order to control the current ratings for both field and armature in such cases we are using starter .

Answer / niranjan

since during starting the back emf is zero and as v=e+ir
and as the armature resistance is approximately negligible
therefore the armature current is very high .Therefore
inorder to limit the starting current a starter is used
for a motor.

Answer / shankar

In motors stator will use for rotote the roter .when will
we not used stator we can't get the magnet filed .when we
give the supply to motor dirctly go to stator resistants &
brons the magentic filed & roter rotate

Answer / pradeep

starter is used for smooth start of rotor without
tremendous increase in current.the help to avoid backlash &
reduce the ohmic losses.

Answer / senthil kumar.a

answer no4 . it is wrote by deepesh is write, but it only
acceptable for dc motors, incase of ac motor

in ac motor thr rotor current dirctly proportional to slip
at the moment of starting the rotor is standstill, it means
the slip has the it is maximum value so therotor current
also maximum . it cause rotor is burned. to avoid it we
must provide the stater

Answer / bala

To give starting resistance to motor.

Answer / karthick

it is used to start the motor.

Why indicate only 440V to 3-phase supply.

4 Answers  

What is OT in a transformer, specify its function.

2 Answers  

why does make gain margin and phase margin on same plot.?

0 Answers  

a solar energy installation utilizes a three phase bridge converter to feed energy into power system through a transformer of 400v/400v.the energy is collected in a bank of 400v battery and is connected to converter through a large filter choke of resistance 10ohms.1.the maximum current through the battrey will be.2.the kva rating of the input transformer is.

1 Answers   GATE,

Can any one provide the inspection procedure of MIMIC for VFD panel? Details: If someone wants to have a mimic in the VFD panel what are inputs considered for the mimic(like on,off,trip) whether we are able to add speed variation in the mimic(if so how can we get) and what are the parameters to be checked in the MIMIC during inspection?

0 Answers  

i need to calulate the cable size when watts are mentaind wat z the formula

1 Answers  

What is the distance between body earthing and neutral earthing.?

1 Answers  

Explain cos(theta) and Sin(theta)

0 Answers  

What is the difference between ground and neutral ?

2 Answers   TCS,

Q) Write VBscript code along with QTPscript code in QTP tool for below scenario 1. Launch yahoo site(i know) 2. Do loogin(i know) 3.Click inbox link(i know) 4.Go to every page of mail box and count no.of read mails and no.of unread mails(i know) 5.Store page numbers, read mail count and unread mail count in a new excel file sheet 6.Create 10 types of graphs on that data 7.Do logout and close site(i know) 8.Save new excel files with graph

0 Answers  

how wud i know that whether i have to use unitized package substation or transformer?

1 Answers  

WHAT IS THE DIFFERENCE BETWEEN UNDERVOLTAGE COIL, CLOSING COIL AND SHUNT TRIP COIL OF AN ACB?

2 Answers   Alstom,