PLEASE SEND THE PREVIOUS YEARS QUESTION PAPERS OF RRB JUNIOR ENGINEER-ELECTRICAL

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what parameters should we check to reduce the power bill

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what is difference between AC VVVF drive & Dc VVVF drive explain their working principle?

13 Answers   Apollo, OPS,

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What are the safeties in elevators?what is the use of governor in elevator?

3 Answers   JLL,

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why we are having many type of vector group in the transformer ,what is the use of it?

2 Answers  

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prove that power consumed in 3 phase delta system is 3 times as compared to 3 phase star system

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What is the type of feedback used in an op- amp schmitt trigger?

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I have tow 200 KVA UPS, both are in parallel mode.My question is that, both are running on battery when power fail, if one of them fail (Eg rectifire fails or some other reason), at thet time reverse power will come to faild ups if it comes then it will harm to failed ups or not? if not then how it protects to faied ups????????????????

1 Answers  

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How to identify phases in the transformer like motor and AC generator but one condition without phase indication like(RYB,UVW)?

1 Answers  

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What is Fire Panel ? How it works ?

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How to measure corona loss in a transmission line?(Plz ans only if u know the exact answer)

3 Answers  

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what is use of reactive power in ac ckt.

2 Answers  

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