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 the inserting resistance in wound rotor induction motor decrease the starting current and increase the starting torque

2 Answers  

what will happen if field winding of Synchronous generators given ac supply

4 Answers  

In a company has been installed an analog amperemeter, this company was suplied by generator X, there is no problem in the ampere meter, rigth now this company's supplied by generator Y then the pointer in amperemeter vibrating. What happened? Why? Thank's

2 Answers  

what should be the no load current of an induction motor

2 Answers  

What kind of test is conducted commonly for generator? And explain briefly

1 Answers   MAHINDRA,

What are the commercial names of overhead conductors used in India?

3 Answers   UPSC,

What is AMP and KA in a MCCB and MCB

2 Answers  

To determine the Healthiness of Insulation we will be performing Dielectric tests i.e Insulation Resistance test, Partial Discharge test,Switching Impulse, Lightning impulse, Tan Delta test ...etc why we required to perform this many test, why cant we do only one test. for Transformer, CT's

1 Answers  

when we gave dc supply to 220v dc motor its rpm is 1200. then we gave 180v. how many rpm of its motor. gave answer with calculation at my ID.... ravizak@ymail.com

0 Answers   Godrej,

Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault

0 Answers   MPSEB,

what is the problem when i want to close a circuit breaker by local position it closes well.but when i close it in remote position it trips

0 Answers   KPCL, MDIM,

1.How to calculate backup time from series connected battery of 12v dc with 26Ah for 2battery?

3 Answers