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

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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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What is the function of a load shedding scheme based on voltage and frequency measurements?

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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 the protective transformers on the 11 kV side. Draw a neat circuit diagram and indicate the given values at appropriate places.

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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What is the function of a load shedding scheme based on rate of change of frequency?

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Explain the concept of the following terms: (i) Connected load (ii) Maximum demand

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Identify energy conservation opportunities in transformer based on material technology.

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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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What is the relation between power in 3 phase delta and star connected system?

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What is the relation between line and phase values in a star and delta connected system?

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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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What is the relationship between the line voltage and the phase voltage in a delta connected load?

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What is the difference between star connected load and delta connected load?

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Give the voltage relation of a series connected self excited generator.

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Give the voltage relation of a shunt connected self excited generator.

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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 happens when transformer is connected to DC?

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Illustrate the load sharing and isolating technique in transformer to predict energy efficiency.

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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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Explain the effect of variable excitation on the behaviour of synchronous motor under constant load condition.

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State the classification of transmission lines based on voltage level and length of lines.

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Compare the salient features of LED and CFL based on (i) Lamp efficiency (ii) Life span.

Compare the salient features of LED and CFL based on (i) Lamp efficiency (ii) Life span.
Answer : Here's a comparison of **LED** and **CFL** based on **lamp efficiency** and **life span**: ### 1. Lamp Efficiency: - **LED (Light Emitting Diode):** - **Higher Efficiency:** LEDs ... longer than **CFLs**. - **CFLs** are moderately energy-efficient and have a shorter lifespan compared to LEDs....

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