Power Systems: Essential Study Resources for Competitive Exams

Power Systems

Q. Which type of transformer is commonly used in power distribution systems?

Solution

Step-down transformers are used in distribution systems to reduce high transmission voltages to lower levels suitable for consumer use.

Correct Answer: B — Step-down transformer

Q. Which type of transformer is used for impedance matching?

Solution

An isolation transformer is used for impedance matching and to isolate different parts of a circuit.

Correct Answer: C — Isolation transformer

Q. Which type of transformer is used to connect two systems operating at different frequencies?

Solution

Phase-shifting transformers are used to connect systems operating at different frequencies, allowing for controlled power flow.

Correct Answer: D — Frequency converter transformer

Q. Which type of transformer is used to increase voltage?

Solution

A step-up transformer increases the voltage from the primary to the secondary winding.

Correct Answer: A — Step-up transformer

Q. Which type of transmission line configuration is most commonly used for high voltage transmission?

Solution

Three-phase transmission line configurations are most commonly used for high voltage transmission due to their efficiency and balance.

Correct Answer: C — Three-phase

Q. Which type of transmission line is most commonly used for long distances?

Solution

Overhead lines are the most common type of transmission line used for long distances due to their cost-effectiveness.

Correct Answer: A — Overhead lines

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