1. Why a DC motor starter is called 3 point starter

Answer Posted / richa

3 Point Starter is a device whose main function is starting and maintaining the speed of the DC shunt motor. it is called three point starteras it has three terminals.
L is the Line terminal, connected to positive supply.
A is the armature terminal and connected to the armature windings.
F is the field terminal and connected to the field terminal windings.
for more information on 3 point starter see here http://circuitglobe.com/3-point-starter.html

Is This Answer Correct ?    0 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

witch pump used in wtp

1628


what is difference between isolation and ultra isolation transformer?, what is the method of testing ?

3835


Whether should be the oil level in OCTC transfomer? It should be upto winding immersed completely or should be upto tap changer s/w? How it will affect the performance of the transformer. Rating may be 33KVA

1411


DEFINE BREAKING CAPACITY OF BUSBAR & HOW IT IS CALCULATED?

4792


What is the comparison of PILC and XLPE cable

1511






What is the diff. between single compression and double compression gland

1530


When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

1682


How to arrange a hous hold earthing system to keep minimum earth resistance( below 7ohms).

1498


why the frequency and voltage in india is 230v and 50HZ. when compared to USA say 110v and 60 HZ.

1011


For group 1 , 2 whather i have to prepare my technical or general studies etc? and im graduate in ee engg. for wht posts im eligible for? please tell me!

1738


Is it true online ups having bypass mode if it is true then why we called ups because it is interrupting power when goes in bypass mode

1550


Why temperature rise is conducted in bus bars and isolators?

767


what is capacitor voltage transformer?? how it is different from potential transformer?

1701


When we have earthing mesh or underground earthing network in industrial plants, weather we have NT-S or NT-C-S kind of earthing system, so eventually weather we must use 4 or 5 wire in 400 volt level (For example 3×150+70 mm2 or 5×150 mm2) in this connection I would like to know exactly the paragraph of IEC or IEEE number

1703


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.

1764