Answer / pillay

You need a magnetic field to produce electrical energy.This
can be produced from electro magnetic means . What if during
a power failure when the DG set usage is most wanted and the
electrical source from a battery is also not available say
due to battery failure or discharged battery.To avoid such
situation a permanent magnet is used instead for initial
excitation.

what is the formula for calculating motor rating? Example: If we want to rotate a 1000 kg waight disc up to 100 RPM, which size motor will require?

1 Answers  

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Is there any design in the world a 220 KV transformer without breather …??????

2 Answers  

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If i switch on a transformer but with no load connected to the secondary path.Is the transformer will burn?

5 Answers  

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specific difference of ICT&Auto Transformer

0 Answers   TNEB Tamil Nadu Electricity Board,

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What will happened, if field voltage change with 220 voltage to 110 voltage for a dc shunt motor?

1 Answers  

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How you calculating the current for a 2.5 Sqmm cable. A 30 Hp 3 phase AC motor of power what size of cable is used for this motor.

7 Answers   Siemens,

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Is it a better option to procure screw type air compressor rather than reciprocating air compressor?If so, what is the reason?How should we select an air compressor(100 CFM)? Please mention the important parameters of air compressor.

0 Answers  

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Give me the calculation steps to design an electromagnet to be work in 230V 50 Hz AC Supply. Also give force that is created by that electromagnet when it gets energized.

0 Answers   GE,

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why tan delta test conducted in electrical equipmenr

4 Answers  

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WHAT HAPPENS IN DIFFERENTIAL PROTECTION IF CT REACHES ITS KNEE VOLTAGE POINT?

4 Answers   Jindal,

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difference between local breaker backup relay or backup protection relay ?

1 Answers  

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why transformer is rated in kva?

2 Answers  

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