Interested to Buy Any Domain ? << Click Here >> for more details...
why is used for starters for staring motors?
- 6 Answers
- 9642 Views
- Amrapali, L&T, I also Faced
- E-Mail Answers
Answer Posted / priya
Starters are used to limit high currents during starting by adding resistors in series with armature circuit which are excluded gradually when the motor speed increases. High starting currents are due to
1. In case of DC motor, initially back emf(E) is zero therefore I=(V-E)/Ra becomes V/Ra. Generally Ra armature circuit resistance is very low hence I is very high during starting. When speed increases back emf increases and I reduces therefore resistors can be excluded.
2. In synchronous motors starters are not used
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
what is the easiest method of short circuit current calculation ? pls. derive with a mathematical example in real life application.
What happens when two positively charged material is placed together?
What is the exact formula for one weber of magnetic flux?
What is the difference between a Root Locus plot and a Bode plot?
What is the function of under voltage release ?
how can we calculate the ratio of caustic soda and water in lrs.
how unidirectional torque is produced in DC motor?
Disadventage of cable-gland earthing if any ?
why ct's&pt'S out put called as burden,why compelsary short ckt the secondary of ct's while removing the burden?
EXPLIAN THE IMPORTANCE OF POLY PHASE CIRCUIT.
WHY NUTRAL GROUND SYSTEM USED IN 33KV SYSTEM
there is an alternator 480 k.w, 400v,50hz, 4-wire running on load having leakage alternator body earthed current 38 A. is it within acceptable limit? if yes then give reference if no then how to bring within specified limit
What will be the effect if I use inverter as UPS mood?
ult of expression 'document.FrmQF.myem
In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.
