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Electric Power and Machines: Autotransformer Quiz

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Electric Power and Machines: Autotransformer Quiz

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Questions and Answers

What is the primary purpose of using an autotransformer during the starting period of an AC motor?

To reduce the voltage supplied to the motor (correct)

To continuously vary the supply voltage

To measure high alternating voltage

To measure high alternating current

What is the key difference between a voltage transformer and a current transformer?

Voltage transformers measure high alternating voltage, while current transformers measure high alternating current. (correct)

Voltage transformers have a small number of secondary turns, while current transformers have a large number of secondary turns.

Voltage transformers have a high power rating, while current transformers have a low power rating.

Voltage transformers use the conductor as the primary winding, while current transformers have a separate primary winding.

What is the purpose of the Buchholz relay in a transformer?

To continuously vary the supply voltage

To detect minor faults or overloads and activate an alarm or trip the transformer (correct)

To measure high alternating voltage

To measure high alternating current

Why is the power rating of a potential transformer (voltage transformer) typically low?

Because the voltmeter is the only load on the transformer Signup and view all the answers

How does a current transformer work to measure high alternating current?

The conductor constitutes a one-turn primary winding, and the secondary winding has a large number of turns. Signup and view all the answers

What is the purpose of a Variac, which is a type of autotransformer?

To continuously vary the supply voltage Signup and view all the answers

What is the primary advantage of an autotransformer compared to a two-winding transformer?

Requires less copper Signup and view all the answers

Which of the following is a disadvantage of using an autotransformer?

Direct connection between primary and secondary Signup and view all the answers

In what application are autotransformers commonly used?

Compensating for voltage drops in transmission lines Signup and view all the answers

What differentiates an autotransformer from a two-winding transformer in terms of size?

Smaller size Signup and view all the answers

Why is an autotransformer not safe for stepping down very high voltages?

Direct connection between primary and secondary Signup and view all the answers

What aspect of an autotransformer allows it to have better voltage regulation than a two-winding transformer?

Common winding for primary and secondary Signup and view all the answers