Answer / super solutions

Most of the Variable frequency Involves PWM technique and
for switching purpose they have IGBT's,. By switching on
And off the IGBT's we can change and control the Frequency.

Answer / capseee

By triggering the IGBT inverter of the drive we can change
output frequency.

Answer / felixraj

by Invertors(cycloconvertors).only condition is to maintain
V/F ratio

Answer / pinoy

Use VFD variable frequency drive, a setting will be
5,10,15,20 30,50 hertz.

Answer / ranjay singh

by the change in no. of poles as well as speed of rotor on
which field wng is mounted.

why voltage drop if we have connected 230 v ac suplly through diode to bulbe we found haft ie 110 voltage drop why it is

4 Answers  

how the earthing point or earthing is taken for ships and airplanes?

1 Answers  

11. As per the theory current doesn’t flows in Neutral, but practically it is not applicable, explain why? 12. How to take the Vector Group Test in Transformer? What is the purpose of doing Vector Group Test? 13. Why the transmission lines are in 11kV, 22kV, 33kv, and why not 10kV, 20kV, 30kV? 14. Why do we generate 3 Phase AC Supply? It is possible to generate 4 Phase and 5 Phase explain it? 15. Explain why the Voltage drop will happen in 3 Phase line? 16. What is the equipment used to control the generator output? 17. What are the factors to be considered during the Synchronization? 18. What should be value of Circuit breaker operating time and tripping time? 19. Why the CT Secondary is rated as 5A generally? 20. At which time Synchronous generator act as a Synchronous Condenser?

1 Answers  

What is meaning of DRU in gen.of AVR.

2 Answers  

In more then 1 phase bulb will glow are not?if yes then how it will glow?

2 Answers  

I am having a DG set.The 415 V from Generator is step up to 460 v and then the same is used for Induction furnace. before Step up, I am connecting LT load to my factory use. When Induction furnace is in service from DG, when i try to start a motor, the generator is tripped.Please tell me the reason.

3 Answers  

How many losses in generators? how we can reduce them? and also in motors,transformers?

1 Answers  

in three phase with neutral connection, what will happen,if the neutral is in open condition with single phase distribution panel ?

2 Answers  

what is the constructional difference in generator if we want to genearate 6.6kv instead of 440v?

1 Answers   Anglo Eastern,

Why transformer making noise during the operation?

2 Answers   TCS,

How does HT work & Voltage required?

0 Answers   Adhunik,

How the electric train gets the supply of electricity? What is the return path of the current?

8 Answers   Siemens,