MAGNETIC CIRCUIT QUIZ

In a magnetic material hysteresis loss takes place primarily due to

Rapid reversals of its magnetization

It high retentivity

Molecular friction

Flux density lagging behind magnetizing force

TRUE ANSWER : ?
YOUR ANSWER : ?

Hysteresis loss least depends on

Volume of material

Steinmetz’s coefficient of material

Ambient temperature

Frequency

TRUE ANSWER : ?
YOUR ANSWER : ?

A material for good magnetic memory should have

High permeability

High retentivity

Low retentivity

Low hysteresis loss

TRUE ANSWER : ?
YOUR ANSWER : ?

The relative permeability of a ferromagnetic material is

More than 10

More than one

More than 100 Ωr 1000

Less than one

TRUE ANSWER : ?
YOUR ANSWER : ?

Silicon steel is used in electrical machines because it has

High coercivity

Low coercivity

Low retentivity

Low hysteresis loss

TRUE ANSWER : ?
YOUR ANSWER : ?

Conductance is analogous to

Inductance

Reluctance

Permeance

Flux

TRUE ANSWER : ?
YOUR ANSWER : ?

Hard steel is suitable for making permanent magnets because

Its hysteresis loop has large area

It has good residual magnetism

Its mechanical strength is high

Its mechanical strength is low

TRUE ANSWER : ?
YOUR ANSWER : ?

Permeability in a magnetic circuit corresponds to_________ in an electric circuit.

Resistivity

Conductivity

Resistance

Conductance

TRUE ANSWER : ?
YOUR ANSWER : ?

Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it

Lowers their power efficiency

Produces fringing

Increases their cost of manufacture

Leads to their increased weight

TRUE ANSWER : ?
YOUR ANSWER : ?

While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?

E.M.F

Current

Current density

Conductivity

TRUE ANSWER : ?
YOUR ANSWER : ?

↑