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Applied Electricity MCQ 1

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Questions and Answers

What is the main energy conversion that takes place in an electric motor?

Kinetic energy to electrical energy
Electrical energy to kinetic energy (correct)
Mechanical energy to electrical energy
Electrical energy to heat energy

How is torque created on the coil in an electric motor?

The coil rotates due to induced current
The coil is connected to a battery
The coil moves through a magnetic field
The magnetic field interacts with the coil (correct)

What principle is a moving-coil loudspeaker based on?

Gravitational force
Electromagnetic induction (correct)
Convection
Conduction

What is the electricity conversion process in a transformer primarily used for?

Changing the voltage of a.c. power supplies (D) Signup and view all the answers

How does an alternating current (a.c.) generator work?

By inducing an emf in a conductor as it moves through a magnetic field (C) Signup and view all the answers

What is the primary function of an electromagnetic relay?

To switch on and off a current in a second circuit (C) Signup and view all the answers

What happens when current flows through a current-carrying conductor in a magnetic field?

The conductor deflects due to the magnetic field (A) Signup and view all the answers

What is the principle behind a simple d.c. motor?

A coil of wire through which current flows rotates between the poles of a magnet (D) Signup and view all the answers

What is the role of the primary circuit in an electromagnetic relay?

To turn on the electromagnet (C) Signup and view all the answers

What happens when the armature is attracted in an electromagnetic relay?

The contacts in the secondary circuit are forced together (D) Signup and view all the answers

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