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Why transformer works on AC?
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Why transformer works on AC rather than DC?
Answer : A transformer works on **AC (Alternating Current)** rather than DC (Direct Current) because of the way it relies on changing magnetic fields to transfer energy between its coils. Here's how it works: 1 ... *. With **DC**, the magnetic field doesn't change, and the transformer can't transfer power....

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A motor has to exert power starting from zero and rising uniformly to 150 HP in 8 mins after which it works at constant power of 100 HP for 5 mins. The motor remains on no load for next 5 mins. The cycle again starts and repeats indefinitely. Determine suitable size of motor.

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Which is the principle on which the bimetallic strip works?

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What is the impact of frequency on transformer design?

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What will happen if DC supply is given on the primary of a transformer?

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Comment on the working principle of operation of a single-phase transformer.

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What are the losses in a transformer on what factors do they depend how they are minimized?

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Explain the effects of harmonics on the transformer.

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A 500kVA distribution transformer having copper and iron losses of 5kW and 3kW respectively on full load. The transformer is loaded as shown below: Loading (kW) Power Factor (Lag) No. of hours 400 0.8 06 300 0.75 12 100 0.8 03 No load - 03 Calculate the all-day efficiency.

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Draw a neat experimental setup to conduct OC test on a single-phase transformer.

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Compare core type and shell type transformer on any four parameters.

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Draw a circuit diagram for polarity test on a single-phase transformer.

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Identify energy conservation opportunities in transformer based on material technology.

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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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A 220V/22kV three-phase transformer is connected in star/delta. The protective transformers on the 220V side have a current ratio of 400/5. Calculate the CT ratio on the 22kV side.

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Explain the relation of V2 and I2 based on the load connected to the transformer.

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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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A plant consists of two 10 MVA generators of reactance 18% each and two 5 MVA generators of 12% each. All are connected to bus bar to supply a load through three step up transformers of 8 MVA each having reactance of 8%. Determine fault MVA on HV side of any one transformer.

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How tube light circuit is connected and how it works?

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What is the difference between an AC and DC transformer?

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Is a transformer AC or DC machine?
Answer : A transformer is an **AC (Alternating Current) machine**. This is because transformers work on the principle of **electromagnetic induction**, which only happens with alternating current. ... coil after the initial moment of current flow. Therefore, transformers only function properly with AC....

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