Answer / Avanish Kumar

zero, as no work is done against an external force during the process.

In constant power region of 3-phase IM torque-speed characteristics, if frequency increases flux A does not alter B decreases C increases D none of above

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21. What is the purpose of taking Capacitance and Tan Delta Test in Transformer bushing? 22. What are the protections to be used for Generator? 23. Draw the vector diagram and condition for the following: 1) Dyn1 2) Ynd0 3) YnYn0 24. What happens when the polarity changes in CT? Explain briefly? 25. Explain the Term in CT Name Plate – Class: 5P10

3 Answers  

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Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

1 Answers  

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What is time invariant system?

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Purpose of lighting transformer.

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Does the total power means fundamental plus Harmonics?

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I want to calculate how much capacitor we connect to maintain the unity power factor? Is there any formula? Pls give me the answer

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How do you select a cable size(cu&Al)for a particular load?

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Mathemetical Relation Between KWRH and KWH?

3 Answers   UPPCL,

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Define stepper motor. What is the use of stepper motor?

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Why r u using pf panel. what the uses

1 Answers   Standard Chartered,

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What is meant by regenerative braking?

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