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What does an audible alarm indicate on a UPS?
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A three-phase transformer having a line voltage ratio of 0.4 kV/11kV is connected Star/Delta and protective transformers on the 0.4 kV side have a current ratio of 500/5. Calculate the ratio of ... on the 11 kV side. Draw a neat circuit diagram and indicate the given values at appropriate places.

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Does an inductor work on DC?
Answer : Yes, an inductor works with DC (Direct Current), but its behavior is different from how it works with AC (Alternating Current). When a DC current flows through an inductor, initially, it ... current changes. Once the DC current becomes constant, the inductor doesn't have much of an effect....

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How do you assess UPS system return on investment (ROI)?

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Explain the tests on a single-phase transformer and develop an equivalent circuit from the above tests.

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What is the role of an automatic voltage regulator (AVR) in a UPS?

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How is an inverter classified based on output waveform?

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What is the effect of supply voltage on the performance of an induction motor?

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What is the role of an electrical technician in UPS maintenance?

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What is the role of an electrical engineer in UPS design?

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What is the role of an input transformer in UPS systems?

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What is the role of an expert technician in UPS maintenance?

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What is the purpose of an isolation transformer in UPS?

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Explain the working principle of an uninterruptible power supply (UPS).

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How does a magnetic stripe writer encode data on magnetic stripes?

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How does a magnetic recording system store information on magnetic media?

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What effect does the induced voltage have on the current in a DC inductive circuit?

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What does hysteresis loss in a DC machine least depend on?

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