WHY EXCITATION OF SYNCHRONOUS MACHINE IS DC NOT AC
- 8 Answers
- 14186 Views
- NTPC, I also Faced
- E-Mail Answers
Answer Posted / raja
When ac supply is provided, the poles will alternate between north and south pole for each half cycle of supply. so there wont be any magnetic interlocking with stator to run at synchronous speed as the polarity changes at the rate of supply frequency. hence for magnetic locking DC supply is used for excitation
| Is This Answer Correct ? | 18 Yes | 0 No |
Post New Answer View All Answers
How can I calculate ISF of current transformer?
What is different between Circuit breaker and Isolater?
WHAT IS THE CURRENT CARRYING CAPACITY OF 2.5/3 CORE HI TUFF CABLE,WILL IT SAFLEY CARRY 8.6 AMPS OVER 120 METRES,CAN YOU ALSO ANSWER WITH FORMULA FOR WORKINGS OUT ,THANK YOU 3RDYR APPRENTICE.
I want d.g.set our company
Define newton's law of viscosity.
why we use circuit breakers for switching instead of normal switching device?
sir please send me iocl written test paper in my e-mail account. i'll be obliged to you........ thank u roshan
What is the physical significance of phase.. i.e. what is exactly the meaning in layman's language.. 1 phase, 3 phase etc ???
Differentiate between ideal and non ideal current sources?
What is the use for cable entry in control room?
how much flux density of CRNO core
What is the difference between hot and cold loop testing?
what id a dry type transformers and its function ?
what is earth resistance? how to measured? and give values at power station and mcc area?
For refrigerators the motor current is raised beyond its rating on both conditions when the voltage of the system is more(say 270v) than the rated voltage(220v) as well as when the voltage of system is less(say 160v) than normal voltageof 220v, why explain?
