Transformers

Can Direct Current produce an EMF?

• Constantly, YES

• For a brief time, YES

• No, never.

• For a brief time, NO

The working principle of transformer is

• Archimedes Principle

• Bernoulli's Principle

• Newton’s Third Law of Motion

• Mutual Induction

In which arrangement will the magnetic field be stronger?

• A single cable

• Multiple cables

• A cable wrapped into a coil

What type of current is passed through the primary coil of a transformer?

• Direct Current (DC)

• Alternating Current (AC)

• Both

• None

The induction of emf in the secondary coil of the transformer is in accordance to

• Ohm's Law

• Faraday's Law

• Stefan’s Law

• Coulomb’s Law

The purpose of providing an iron core in a transformer is to

• Reduce Hysteresis loss

• Provide support to windings

• Decrease the reluctance of the magnetic path

• Reduce Eddy Current losses

In a step-down transformer

• Both current and Voltage decrease

• Both current and Voltage increase

• Voltage decreases, Current increases

• Voltage increases, Current decreases

Which coil has more turns in a step-down transformer?

• Primary Coil

• Secondary Coil

• Both have an equal no. of turns

Which type of transformer is used by a power station to transport electricity to cities?

• Step Down

• Step Up

• Either of the two types

• Neither of the two types

How is energy loss due to eddy currents in a transformer reduced?

• Using Alternating current

• Using Direct current

• Using a soft iron core

• Laminating the iron core