Answer / keshava murthy

'Supply Frequencty' is directly proportional to generator
speed and number of poles. So by varying the above two can
change the frequency.

Answer / venkatesh

Speed (N) = 120F/P

By varying the pole we can change the frequency and By
Semiconductor Device like IGBT etc.,

Answer / viren

to change the fr. for an application first we have to convert incoming supply into dc by using rectifier & again convert it into ac with the help of inverter and fr of this ac supply can be change by changing firing angle of scrs .

Answer / desingurajan ramco cements...

In my way, only two methods r possible to change the supply frequency. on is To adjust the generating supply frequency(adjust the speed of generator)And to convert
incoming supply into dc by using rectifier & again convert it
into ac with the help of inverter and fr of this ac supply
can be change by changing firing angle of scrs .

Answer / mubeen

Voltage frequency can be changed by using of VFD ( variable
frequency drive ) which consist of SCR,Diode,etc.it can
make from zero to > 250 HZ.means can control the motor
speed or frequency of suppllied voltage.

Answer / edison

By Using Cyclo Converter We can change the incoming supply
frequency.

Answer / arun

WE can change the supply frequeny by using with thyistor
modules

Answer / sushant

we can change the frequency Chnging the motor pole or shoe.

if any body have question paper of railway (section engineering),then plz send me .i will thank of him/her.

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