why frequency should be constant?

Answer Posted / nithi

In the power system most of the loads are induction motor
(nearly about 60%).so,apply this question for induction
motor.

For rated voltage,

below rated freq.: speed variation,high intake
current,over heating,insulation failure,core
saturation,harmonics production.

above rated freq.:drastic reduction in torque
production,speed variation.
so,frequency should be maintained constant.

Is This Answer Correct ?    8 Yes 5 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

how to find motors H.P. whout any rating? (only give you a motor and multimeter)

4830


ELECTRICAL ENGINEER TEST IN FEWA ANY ONE HAVE KNOWLEDGE ABOUT THIS?????????

568


What is the gross weight to copper ratio in slip ring induction motor of 4000 HP,6.6 kv, 372amp, 992 rpm GE motor.

1917


WHAT ARE THE DISADTAGES OF SINGLE-WIRE-EARTH-RETURN SYSTEM USED FOR RURAL ELECTRIFICATION?

1489


What is an Air COmpressor

1727






Is it good to short Neutral and Ground in the PLC or DCS main Power supply. Pls give YES or NO with reasons...? Simarpreet

2057


how does WTI work ?

1535


Difference between ac parallel circuit and ac series circuit?

1613


The power factor of the fixed load is 0.8, now the p.f is varying from 0.8 to 0.5.

1584


what is vA rating and class of a ct.

1427


What will happened if the neutral of secondary of Xformer ( Star point) Note it's above KVA rated Xformer

1423


What is the technical difference between On delay timer and a Star delta timer?

954


What are the symptoms of a bad PG card of a drive (inverter) esp. of Yaskawa Ac Drives (inverters) G7 ?

1581


Two bulbs of 100w and 40w respectively connected in series across a 230v supply which bulb will glow bright and why?

627


hi can anyone pls tell me the eee interview core questions asked in l&t

1551