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Questions and Answers
What is the primary purpose of using an autotransformer during the starting period of an AC motor?
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?
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?
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?
Why is the power rating of a potential transformer (voltage transformer) typically low?
How does a current transformer work to measure high alternating current?
How does a current transformer work to measure high alternating current?
What is the purpose of a Variac, which is a type of autotransformer?
What is the purpose of a Variac, which is a type of autotransformer?
What is the primary advantage of an autotransformer compared to a two-winding transformer?
What is the primary advantage of an autotransformer compared to a two-winding transformer?
Which of the following is a disadvantage of using an autotransformer?
Which of the following is a disadvantage of using an autotransformer?
In what application are autotransformers commonly used?
In what application are autotransformers commonly used?
What differentiates an autotransformer from a two-winding transformer in terms of size?
What differentiates an autotransformer from a two-winding transformer in terms of size?
Why is an autotransformer not safe for stepping down very high voltages?
Why is an autotransformer not safe for stepping down very high voltages?
What aspect of an autotransformer allows it to have better voltage regulation than a two-winding transformer?
What aspect of an autotransformer allows it to have better voltage regulation than a two-winding transformer?
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