Answer / manoj kumar sahoo

A ballast & ignitor is required in MH & other lighting
fixture because its takes high voltage in starting and
normal voltage in running periods.

Answer / k.prakashchandra

They create high voltage initially to strike the arc, then
the ballast limits the current as the resistance of the bulb
becomes zero due to ionization.

What is meaning of out of phase (making & breaking) capacity And how to calculate

0 Answers   BMC,

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Is it possible to use AC supply insted of DC supply in trip coil operation? if not, why?

5 Answers   HAL,

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why u want to work in sail/ntpc as u r already in an it company where life is good, good environment no much tensions etc?

6 Answers   Sail,

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why voltage rating of transformers are in multiples of 1.1?

3 Answers  

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what is the difference between squirrel cage & slip ring induction motor by construction & working principle ?

1 Answers   Sail,

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What should be the length of transmission line so that we can see/obtain the full sine wave of voltage??

0 Answers   Siemens,

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what will hapen if secodery circuit is open of current transformer

8 Answers   KPTCL,

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why high voltage is reqiured or L.T. panels? what type of tests should be taken for electrical panels?

2 Answers  

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How we calculate the spacing between the conductors in 11,33KV lines?

3 Answers   NHPC,

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On the transformer breather at what length should i change my sililca gel.

4 Answers  

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what happen if drive input fail momentry at 48.5 HZ frequency?

0 Answers  

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What is the rating factor for copper cable ( Specific value according to the type of laying ) & the voltage drop?

0 Answers  

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