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Is a 3 phase transformer AC or DC?
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Is 3 phase AC or DC?
Answer : 3-phase is **AC (Alternating Current)**. In a 3-phase system, there are three separate alternating currents, each with the same frequency but with a phase difference of 120 degrees between them. This setup is commonly ... to single-phase AC. So, to clarify, **3-phase is a type of AC, not DC**....

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Is DC single-phase or 3-phase?
Answer : DC (Direct Current) is neither single-phase nor three-phase. The terms "single-phase" and "three-phase" are used to describe types of AC (Alternating Current) power systems, where the voltage ... alternating cycles. So, it's fundamentally different from both single-phase and three-phase AC systems....

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Is a transformer AC or DC?
Answer : A transformer works with **AC (Alternating Current)**. It cannot operate with **DC (Direct Current)** because transformers rely on the changing magnetic field created by AC to transfer energy between ... needed for a transformer to function. As a result, a transformer won't work properly with DC....

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Is 1 phase AC or DC?
Answer : 1-phase power refers to **AC** (Alternating Current), not DC (Direct Current). In a 1-phase system, the current alternates in direction, flowing first in one direction and then in the opposite direction, ... So, when you hear "1-phase," it typically refers to a single-phase **AC** power system....

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Is transformer output AC or DC?
Answer : The output of a transformer is **AC (Alternating Current)**. Transformers are designed to work with AC because they rely on the principle of electromagnetic induction, which requires a changing ... to use additional components like rectifiers to convert the AC output from the transformer into DC....

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Is electrical transformer AC or DC?
Answer : An electrical transformer works with **alternating current (AC)**, not direct current (DC). Here's why: - Transformers rely on the principle of **electromagnetic induction**. For this process ... designed to work with AC to step up (increase) or step down (decrease) voltage levels effectively....

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Why 3-phase, why not 6 or 12?
Answer : Great question! The reason why 3-phase power is commonly used instead of 6 or 12-phase comes down to a few practical and engineering factors: ### 1. **Efficiency**: ... . Increasing the number of phases adds complexity without offering significant practical benefits for most common applications....

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How is DC converted to 3-phase?
Answer : Converting DC (Direct Current) to 3-phase AC (Alternating Current) is done using a device called a **DC to 3-phase inverter** or **3-phase converter**. This process involves switching the DC ... . Hope this clarifies the process! Would you like more details on any part of the conversion process?...

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Why transformer is used only for AC not DC?
Answer : Transformers are used only for AC (Alternating Current) and not for DC (Direct Current) because of how they operate. A transformer works on the principle of electromagnetic induction. It needs a changing ... field, so no voltage is induced in the secondary coil, and the transformer can't work....

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What is the difference between an AC and DC transformer?

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What is the difference between AC transformer and DC transformer?

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What is the rotor of a 3 phase motor?
Answer : The **rotor** of a 3-phase motor is the rotating part of the motor that interacts with the magnetic field created by the stator (the stationary part). In simple terms, it's the part of the ... due to the interaction with the magnetic field created by the stator, allowing the motor to do useful work....

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What is the RPM of a 3 phase motor?
Answer : The RPM (Revolutions Per Minute) of a 3-phase motor depends on two key factors: 1. **The number of poles in the motor**: Motors come with different numbers of poles, such as 2, 4, 6, etc ... synchronous speed is calculated using the formula above, and the actual RPM will be a bit less due to slip....

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Draw a neat labelled diagram of 3-phase electronic energy meter.

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Explain with the help of a neat diagram the working of a 3-phase autotransformer. Write any two applications.

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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.
Answer : Let's break down the problem step by step and calculate the received end voltage and the efficiency of the line. ### Given Data: - Power delivered to the load, \( P = 4000 \, \text{kW} \) - Power factor, \( \text{p. ... voltage**: \( 10.43 \, \text{kV} \) - **Efficiency of the line**: \( 98.61\% \)...

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Explain with a sketch protection of 3-phase induction motor during single phasing.
Answer : ### Protection of a 3-Phase Induction Motor During Single Phasing **Single Phasing** is a condition where one of the three phases (L1, L2, L3) of a 3-phase system fails or gets ... serious harm can occur. This protects the motor windings and ensures the motor runs safely under normal conditions....

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Explain working of autotransformer starter for a 3 phase induction motor with neat diagram.

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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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State the principle of a 3-phase induction motor.
Answer : The principle of a 3-phase induction motor is based on the interaction between the rotating magnetic field produced by the 3-phase supply and the rotor of the motor. Here's how it ... rotor. This interaction between the two magnetic fields causes the rotor to rotate and produce mechanical motion....

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Write the expression for the instantaneous values of EMFs in a 3-phase circuit.
Answer : In a 3-phase circuit, the instantaneous values of the electromotive forces (EMFs) can be expressed as sinusoidal functions. Assuming a balanced three-phase system, the instantaneous values of the EMFs ... voltages are 120 degrees out of phase with each other, ensuring that the system is balanced....

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State the relationship between line voltage & phase voltage and line current & phase current in a 3-phase star connected system.
Answer : In a 3-phase star (wye) connected system, the relationship between line voltage, phase voltage, line current, and phase current can be summarized as follows: ### 1. **Line Voltage and ... and currents behave in a 3-phase system, especially when configuring systems for different types of loads....

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State the relationship between line voltage & phase voltage and line current & phase current in a 3-phase delta connected system.

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Derive the condition for maximum torque under running condition of a 3 phase induction motor.

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