These are some of the NTPC Interview questions which were asked to my friends...
1)Which is more harmful? AC or DC? Why?
2)How much will the frequency vary in a power system?
3)Human Body withstanding voltage?
4)How will you step up your DC voltage?
5)One question about your project?
6)What is Potier triangle?
7)Draw the inverted V and V curves?
8)What is Ferranti Effect?
9)What is slip?
10)What type of winding is used in motors? Star or Delta? Why?
11)What are the different parts of the Transformers?
12)Draw the equivalent circuit of Transformers?
13)Draw the Transformer?
14)Tell about Salient and Non-Salient poles? Where both are used?
15)If there is a frequency drop in a Power System how will how rectify it?
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