I Just want do EHS Certified Certification Distance Course From Govt approved,so can any body provide me details.

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What are differences between Conventional & Addressable type smoke detectors?

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what is extra low voltage system

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can we use only a isolator in the subtation..

1 Answers   ABB,

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why generally transformer are in star to delta

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if a motor is running at 1500rpm then how you can find its HP

1 Answers   Construction,

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What is annunciator ?

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we have consol make 3 phase servo stabilizer for cnc m/c. while installing the earth neutral voltage is 1.7 volts at stbilizer off condition and when stabilizer get on en voltage reaches 4.8 volts (new earthing is done and neutral is helthy condition all phase to neutral volts 440,442,441 v)why this happen.solution for cause.

3 Answers  

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What will happen if supply to three phase motor is given wiyhout inerting rotor in it?How much current it will draw?

5 Answers  

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What happens if we give the supply to the rotor of induction motor and make its terminal shorted?

2 Answers  

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why do we have spikes enough to burn electronic boards, when generators are not grounded

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how and where does star and delta connection is used ?

2 Answers  

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