JIS School of Polytechnic Lecturer Electrical Engineering Interview Questions and Answers

An auto transformer is a type of transformer where part of the winding is common to both the primary and secondary circuits.

• Auto transformer has a single winding with a tap that can be moved to adjust the voltage ratio.

• It is more efficient and cost-effective compared to conventional transformers.

• Auto transformers are commonly used in applications where the voltage ratio between the primary and secondary circuits is not

A generator is a device that converts mechanical energy into electrical energy.

• Generates electricity through electromagnetic induction

• Common types include diesel generators, wind turbines, and hydroelectric generators

• Consists of a rotor, stator, and an external power source to turn the rotor

The voltage provided in a railway varies depending on the country and type of railway system.

• Voltage in railways typically ranges from 750V DC to 25kV AC.

• In the United States, most railways use 750V DC for overhead lines.

• In Europe, standard voltage for high-speed trains is 25kV AC.

• Different sections of a railway network may have different voltage levels based on the requirements.