Give the specification of a three-phase transformer as per IS : 1180 (Part I).

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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How does a three-phase transformer work?

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State the definition of energy audit as per energy conservation act.

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An industrial consumer charged with the scheduled tariff of Rs.250 /kVA per month for maximum demand and 150 paisa per unit consumed for load factor of 60% and 80%. Find overall cost per unit at i) unity P.F. ii) 0.9 P.F. consider maximum demand of 50 kVA.

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A 3 phase line of 4 km length delivers 4000 kW at a p.f of 0.8 lagging to a load the resistance and reactance per km of each conductor are 0.2 Ω and 0.5 Ω respectively if the voltage at the supply end is maintained at 11 kV. Calculate the received end voltage and efficiency of line.

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Give one application of (i) Mineral oil (ii) Varnish (iii) Synthetic oil (iv) Vegetable oil.

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Give one application each of the following transducer: (i) LVDT (ii) RVDT (iii) Capacitive (iv) Piezoelectric.

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Give any two applications for i) Universal motor and ii) Hysteresis motor.

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A (50/60 Hz) Transformer. Which one will give more Output?

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Can I use an AC motor as a generator?

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Explain with justification two uses of each of two following as an electrical conductor: (i) Brass (ii) Silver.

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Can I use unipolar stepper motor as bipolar?

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A single phase AC distributor AB 300 M long is fed from end A and is loaded as under.

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Compare between: (i) Ultrasonic and Radar type level measurement (any three points) (ii) U-tube and well type manometer (any three points).

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The power input to a 500V 50Hz 6Pole 3 phase induction motor running at 975 rpm is 40 kW. The stator losses are 1kW and friction and windage losses are 2kW. Calculate: (i) Slip (ii) Rotor copper loss (iii) Shaft power (iv) Efficiency

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What are the benefits of a three-phase UPS?

What are the benefits of a three-phase UPS?
Answer : A **three-phase UPS** (Uninterruptible Power Supply) offers several advantages over single-phase UPS systems, especially for larger or more complex electrical setups. Here are the key ... for larger setups, making it the preferred choice for applications with significant power requirements....

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