as we know that N=120f/P speed of an im can be controled only through changing no if poles, can we control by changing the frequncy????

7 Answers   JSW,

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For the same power rating,which motor is bigger in size,AC or DC?

9 Answers   Bhel,

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What is difference between insulating medium and fault current interruption medium in a switching device.

0 Answers  

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a 3 phase slip ring induction motor is wound for 4 poles on stator and 6 poles on rotor; when 3 phase balanced voltage source at 50 hz is applied to motor it will run at a)1500rpm b)1000rpm c)750 rpm d)zero rpm

13 Answers   Essar, PSPCL, PSTCL,

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what will happen if neutal in AC ckt will get open

3 Answers  

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What do you mean by a phase angel of instrument transformer?

0 Answers  

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What are the relays in ACB and VCB

0 Answers   ABB, Bhel,

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How to calculate the 2500 Kva Transformer losses Primary 11KV Secondary 415volts

1 Answers   Laurus,

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generator(Deutz 550kv)is runing for 2 hours with load of 900 amp and then it goes in shutdown with alarm fault messege of speed fault although heirtz reading fixed at 50,what does that mean

1 Answers  

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how can we change the supply frequency?

8 Answers   Areva,

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Why electric traction is used ??

3 Answers   IOCL,

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What is the working principle of CFL & T5 tube light & 40W tube light with electronic ballast?

0 Answers   Remi,

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