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 Diff btw Fire Alarm & VESDA System???

0 Answers   EFY, Emerson,

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what is meant by moulded case circuit breaker ?

0 Answers   ABB,

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why hv current transformers have big size ?

5 Answers   RailTel, TCS,

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What are the advantages of autotransformer?

0 Answers  

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how calculate external illumintion in a compound area. for e.g. there is one open park having 600m2 area and i have to put 40w flouresent tube fitting with pole. how shall i calculate the numbers of fitting.

1 Answers  

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Why do we generate 3 Phase AC Supply? It is possible to generate 4 Phase and 5 Phase explain it?

4 Answers  

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what are the precuation should be taken ahen installing power transformer,circuit breaker,current & potential transformer

0 Answers   Siemens,

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What is ELCB?

9 Answers   Bhel, CDS, IOCL,

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What is an Isolation Xformer? What is the use of it?

2 Answers  

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In electrical cables what is U and U0 refers?

11 Answers  

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What are diffrent type of road taxes?

0 Answers   Siemens,

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how generater works

4 Answers  

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