Answer Posted / shekhar

NO,in dc motors when ac given to the armature IT CONVERTS IT INTO DC and produces a stationary armature magnetic field,if ac is aplied o the shunt field it will produce alternating field which will produce torque in opposite torque in alternate half cycles so avg. torque will b zero.

Dear all, how we select the cable size according  to current with or without including different correction factor , is there any direct method for sizing of cable... 

2108

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how to Select Lighting arrester? What r the parameters to be considered for the selection of Lighting arrester ?

1680

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How to measure power in 2 or 4 or n phase circuit? Please give me a formula.

1865

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what happen when we add mentos in cold drink?& why?

1992

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what is servo motor & how does it work.

1883

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Why we used 690V in ACS 800 drives.Why dont use standard voltage like 415v or 1.1Kv

2393

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How does zener phenomenon differ from avalanche breakdown?

1111

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can i connect REF and Differencial relay in 1 CT core for transformer protection?

1868

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how to calculate the capacitor to maintain power factor?

2101

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It is desired to flood light the front of a building 42 meters wide and 16 meters hig.Projectors of 30 degree beam spread and 1000 watt lamps giving 20 lumen/watt are availabl.If the desired level of illumination is 75 lumen/m and show a suitable scheme.Assume the cofficient of utilization, deprecitation factor and waste light factor are 0.4, 13 and 1.2 respectively.

3809

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what is maxemo work permit procedure

2155

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what is the difference between elcb and rccb ?

2265

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The D.C. spark test is applicable to single conductor cable & assemblies of insulated single conductor cables without insulation shield,metallic sheath or metalic armor?

1803

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DEAR SIR/MADAM,CLEARLY EXPLAIN ABOUT CRAWLING AND COGGING EFFECTS IN INDUCTION MOTOR.

1841

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how the phase convertor changes the no. of phases

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