Electric Motor | MCQs

Explanation

The commutator is a crucial component in a DC motor that reverses the direction of current through the coil every half-cycle.

It is a mechanical switch that rotates with the armature.

It makes contact with the brushes, switching the current flow to the coil as the armature rotates.

Explanation

• An electric motor converts electrical energy into mechanical energy, producing motion or rotation.
• It uses electromagnetic forces to generate torque, which drives a shaft or other mechanical components.

Explanation

Back e.m.f. is directly proportional to the speed of the motor.

As the motor speed increases, the back e.m.f. also increases.

Explanation

In a delta connection of an induction motor, 5 slips are typically required.

These represent the number of distinct slip rings needed for the rotor winding connections.

Explanation

The Reluctance Motor has an unsymmetrical rotor.

Its rotor has varying magnetic reluctance, which influences its operation and performance.

Explanation

In March 2023, United Auto Industries launched its first Electric Motorcycles in Pakistan.

United Auto Industries: Pakistani automobile manufacturer

United Auto Industries is based in Lahore (founded 1999)

Explanation

Michael Faraday: an English scientist who invented Electric Motor in 18th century.

Explanation

If the armature current is maintained at 200% of its rated value, the machine's rated current would be 2 times the rated current.

This is because the current is doubled from its rated value.