Quiz : Electromagnetic Induction

"Eddy Currents" are set up in a direction_____________.

An Inductor may store energy in its__________________.

The component in the generator which consumes energy is called ______.

Devices that consume electrical energy in the external circuit of the generator are known as:

On what principle does a transformer work?

The direction of the induced current is always so as to oppose the change which causes the current. This is the statement of:

The Lenz's law refers to:

When the current in a coil changes from 0 to 10 A in 0.025s, an average emf induced in a neighboring coil is 600V, the Mutual inductance for two coils is:

The inductance is more in the self-induction of ____.

Eddy currents produced in the core of the transformer are responsible for ____.

When a motor is just started, back emf is almost ____.

Commutator was invented in ____.

The working principle of the transformer is ____.

A real transformer does not change.

When the back emf in a circuit is zero. it draws

Turn ratio of a transformer is 50. If 220V AC is applied to its primary coil, the voltage in the secondary coil will be ____.

The direction of the induced current is always so as to oppose the change which causes the current is ____.

If the motor is overloaded, then the magnitude of “back emf” ____.

Which one of the following is not present in A.C. generator ____.

The inductance can be increased by winding the wire around a core made of ____.

The winding of the electromagnet in the motor is usually called ____.

The mutual induction plays role in ____.