MAGNETISM AND ELECTROMAGNETISM QUIZ

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Decreases

None of the listed here

Increases

Remain same

TRUE ANSWER : ?
YOUR ANSWER : ?

Main causes of noisy solenoid are

uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

Both of the listed here

strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The direction of a magnetic field within a magnet is

from north to south

front to back

back to front

from south to north

TRUE ANSWER : ?
YOUR ANSWER : ?

If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

Decrease

None of the listed here

Increase

Is zero

TRUE ANSWER : ?
YOUR ANSWER : ?

If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

increases

remains unchanged

decreases

reverses polarity

TRUE ANSWER : ?
YOUR ANSWER : ?

For a given wirewound core, an increase in current through the coil

reverses the flux lines

decreases the flux density

causes no change in flux density

increases the flux density

TRUE ANSWER : ?
YOUR ANSWER : ?

Reciprocal of permeability is

Reluctivity

Permeability

conductance

Susceptibility

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following type of materials are not very important for engineering applications?

Paramagnetic material

Ferro magnetic material

None of the listed here

Diamagnetic material

TRUE ANSWER : ?
YOUR ANSWER : ?

Ferrites are a sub-group of

Non-magnetic materials

Paramagnetic material

Ferro magnetic material

Ferri-magnetic material

TRUE ANSWER : ?
YOUR ANSWER : ?

The initial permeability of an iron rod is

The highest permeability of the iron rod

The permeability at the end of the iron rod

The permeability almost in non-magnetised state

The lowest permeability of the iron rod

TRUE ANSWER : ?
YOUR ANSWER : ?