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

Explain the concept of the following terms: (i) Connected load (ii) Maximum demand
Answer : Sure! Here's a simple explanation of both terms: ### 1. **Connected Load:** - **Definition:** The *connected load* refers to the total electrical power (in kilowatts, kW or kilovolt- ... appliances run simultaneously at full capacity. Let me know if you'd like to dive deeper into these!...

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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.
Answer : To calculate the all-day efficiency of the transformer, we need to consider the total energy output, the total energy input, and the losses over a 24-hour period. The transformer experiences two types of ... \] ### Final Answer: The all-day efficiency of the transformer is approximately **98.39%**....

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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?

What happens when transformer is connected to DC?
Answer : When a transformer is connected to DC (Direct Current), it doesn't work as intended. Here's why: 1. **Transformer Principle**: Transformers operate on the principle of electromagnetic induction, ... is not suitable and can damage the transformer. Transformers are designed to work with AC, not 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.

Explain the effect of variable excitation on the behaviour of synchronous motor under constant load condition.
Answer : The excitation in a synchronous motor refers to the direct current (DC) supplied to its field winding. This excitation determines the strength of the magnetic field produced by the rotor ... in optimizing the motor's performance, especially in power factor correction and reactive power management....

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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 **lifespan**: ### 1. **Lamp Efficiency:** - **LED (Light Emitting Diode)**: - **Efficiency**: LED lamps ... and **last longer** than **CFLs**, making them the better choice in terms of both energy savings and longevity....

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Compare the salient features of mercury vapour lamp and sodium vapour lamp based on (i) lamp efficiency (ii) lumen output.

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On which principle KVL and KCL are based?

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Distinguish between Energy conservation and Energy audit based on activities.

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Explain Star and Delta connected three-phase balanced circuits.

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Explain the effects of harmonics on the transformer.

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State two applications of: (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material.

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List co-generation systems based on sequence of energy used.

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List the types of DC Motors based on the connection of the field windings.

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How do you select a LED based on its color rendering?

How do you select a LED based on its color rendering?
Answer : When selecting an LED based on its **color rendering** performance, you'll primarily focus on the **Color Rendering Index (CRI)**. CRI is a measure of how accurately an LED (or any light ... you'll be able to select an LED that provides the color accuracy you need for your specific application!...

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How do you choose an LED based on beam angle?

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How is an inverter classified based on output waveform?

How is an inverter classified based on output waveform?
Answer : Inverters can be classified based on the type of output waveform they produce. The three main classifications are: 1. **Square Wave Inverter**: - **Output Waveform**: A square ... wave inverters being a middle-ground option, and pure sine wave inverters providing the highest quality output....

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On what law galvanometer is based?

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Which thermometer is based on Seebeck effect?

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What are the classification based on transmission technology?

What are the classification based on transmission technology?
Answer : Transmission technologies can be classified based on various factors, including the medium through which data is transmitted, the way signals are modulated, and the technology used. Here's ... to understand how transmission technology works and what its strengths are for different applications....

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What is the Snell's law based on?

What is the Snell's law based on?
Answer : Snell's Law is based on the **principle of wavefront continuity** and **Huygens' principle**. It describes how light bends when it passes from one medium to another due to a change in ... by considering the varying speed of light in different media. Would you like a deeper mathematical derivation?...

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What is the divergence theorem based on?

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What law is Tellegen's theorem based on?

What law is Tellegen's theorem based on?
Answer : Tellegen's theorem is based on **Kirchhoff's Current Law (KCL)** and **Kirchhoff's Voltage Law (KVL)**. These laws are fundamental to circuit theory. - **Kirchhoff's Current ... connects the power input and output of electrical components in a network, showing the relationship between them....

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What is the superposition theorem based on?

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Classify current limiting reactors based on location.

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Is RTOS based on Linux?

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On what principle is KVL based?

On what principle is KVL based?
Answer : Kirchhoff's Voltage Law (KVL) is based on the **principle of energy conservation**. It states that the sum of all voltages around any closed loop or mesh in a circuit is always ... in analyzing complex circuits by breaking them down into smaller loops and solving for unknown voltages or currents....

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Why is the transformer connected in delta Star?

Why is the transformer connected in delta Star?
Answer : A transformer is connected in a **delta-star (Δ-Y)** configuration for several practical reasons in electrical systems. Here's why it's commonly used: ### 1. **Step-down Voltage* ... single-phase connections. It offers benefits like voltage stability, load balancing, and better handling of faults....

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There are a Transformer and an induction machine. Those two have the same supply. For which device the load current will be maximum? And why?

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Explain the layout of a thermo-chemical based (Municipal waste) power plant.

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Explain the operation of opto coupler based triggering circuit with diagram.

Explain the operation of opto coupler based triggering circuit with diagram.
Answer : An optocoupler (also known as an optoisolator) is a component used to isolate different sections of a circuit, particularly for triggering purposes. It uses light to transfer signals between ... -voltage signals, such as in industrial control systems, power electronics, and automotive applications....

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Explain with a neat diagram a microcontroller-based water level controller.

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Explain the connection of a series connected self excited generator.

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Explain the connection of shunt connected self excited generator.

Explain the connection of shunt connected self excited generator.
Answer : In a **shunt-connected self-excited generator**, the field winding (which is responsible for creating the magnetic field) is connected in parallel (shunt) with the armature winding (where the ... depends on the initial voltage buildup). - It is sensitive to load fluctuations at low speeds....

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