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Transformer Taping
Why tapings of Transformer is always provided on HT side? why not on LT side?
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Reactive Power Relation with Alternator
How reactive power is related to alternator? Wheather it is generated or consumed? Explain
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Induction Motor
Why star point of star connected motor is not grounded?
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Alternator
Why alternator is operated at lagging power factor? How alternator responses with changing the load?
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Circuit Breaker
Which Circuit Breaker is better either Air CB or Vacuum CB? Why?
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Use of DC machine
We have enough category of AC machines more relliable than DC machine then why we are using DC machines in some application yet?
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OC/SC Test On Low Voltage Side
Why OC test is carried out on low voltage side of transformer?
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Transformer Sound
Why do you get a typical sound when the transformer is put into operation?
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Rated Voltage and Frequencey
Why OC test is carried out at rated voltage and frequency?
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Current Transformer
Explain why the secondary terminal of current transformer should not be lift open circuited.
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3 Phase
Why there is 220v in 1-phase but 440v in 3-phase?
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Save Power
Suppose the electricity board gives 11 kw, but the machine requires only 8 kw in such case how can we save the excess power?
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UPF and LPF Wattmeters
How is UPF Wattmeter different from LPF Wattmeter?
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Phase Identification
In a three phase system three wires are of colour red, yellow and blue are used to discriminate each phase. Now how will you identify each phase wire without knowing the colour and without any pre information?
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Measure Reactive Power
Can we measure reactive power by using only a single wattmeter? If Yes, How?