ELECTRONICS CHAPTER 1 1

A magnet that is heated will

• increase in magnetism

• decrease in magnetism

• not change its magnetism

• become demagnetized

Inserting a soft iron core into a coil has what effect on the inductance of the coil?

• Increase inductance

• Decrease inductance

• Does not affect the inductance

• None of these

Permeability is the inverse equivalent of which electrical term?

• Voltage

• Current

• Resistance

• Conductance

The Hall effect

• is a phenomenon with no practical application

• is used in various sensor applications

• can develop potentials of thousands volts

• is the basis for solar cell operation

Unit of reluctance in SI is

• amp-turns/weber

• amp-turns

• amp-turns/meter

• none of these

A lead-acid battery is an example of&

• solar cell

• fuel cell

• primary battery

• secondary battery

Permeability is the _______

• Power found in the electromagnet

• Power found in the magnetic field

• Ease with which metals maybe magnetized or demagnetized

• Power found in the transformer

Which of the following refers to the point where the intensity of magnetic lines of force is maximum?

• Magnetic pole

• Weak pole

• North pole

• Great circle

Ferrites are made of what material?

• Ceramic

• Porcelain

• Silica

• Alloy

Where do magnetic lines go when they collapse back into a wire?

• Into the field which surrounds each atom

• Into free space

• Into the core itself

• Into the coil itself