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Electrical Machines Quiz

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Questions and Answers

What is the main function of a transformer?

Regulating the flow of electricity

Changing the voltage and current levels (correct)

Converting DC electric power to AC electric power

Maintaining constant frequency and power

In a transmission line, why is a step-up transformer used?

To maintain constant frequency and power

To convert AC power to DC power

To regulate the flow of electricity

To convert generated voltage to high voltage for proper transmission (correct)

What principle does a transformer work on?

Boyle's law

Ohm's law

Faraday’s law of electromagnetic induction (correct)

Newton's law of motion

What is induced when a carrying conductor is placed in a varying magnetic field?

<p>An electromotive force</p> Signup and view all the answers

What is the relationship between input kVA and output kVA in a transformer?

<p>It can vary, not always equal</p> Signup and view all the answers

Study Notes

Transformers

The main function of a transformer is to transfer electrical energy from one circuit to another through electromagnetic induction.
A step-up transformer is used in a transmission line to increase the voltage of the alternating current (AC) to reduce energy loss during transmission.

Operating Principle

A transformer works on the principle of electromagnetic induction, where a varying magnetic field induces an electromotive force (EMF) in a coil.

Electromagnetic Induction

When a carrying conductor is placed in a varying magnetic field, an electromotive force (EMF) is induced in the conductor.

Transformer Characteristics

The input kVA and output kVA in a transformer are equal, as the transformer does not change the power (measured in kVA) but only the voltage and current.

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Description

Test your knowledge of electrical machines with this quiz on transformers, DC machines, induction motors, and synchronous machines. Learn about the functions and principles of single-phase transformers and their role in converting AC electric power at different voltage levels.