MAGNETIC CIRCUIT QUIZ

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

E.M.F

Current density

Conductivity

Current

TRUE ANSWER : ?
YOUR ANSWER : ?

Hysteresis loss least depends on

Ambient temperature

Frequency

Steinmetz’s coefficient of material

Volume of material

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Resistivity

Resistance

Conductance

Conductivity

TRUE ANSWER : ?
YOUR ANSWER : ?

Silicon steel is used in electrical machines because it has

High coercivity

Low retentivity

Low hysteresis loss

Low coercivity

TRUE ANSWER : ?
YOUR ANSWER : ?

The relative permeability of a ferromagnetic material is

More than one

More than 100 Ωr 1000

More than 10

Less than one

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YOUR ANSWER : ?

The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs

50

500

20

70

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YOUR ANSWER : ?

A material for good magnetic memory should have

Low hysteresis loss

High retentivity

High permeability

Low retentivity

TRUE ANSWER : ?
YOUR ANSWER : ?

In a magnetic material hysteresis loss takes place primarily due to

Flux density lagging behind magnetizing force

Rapid reversals of its magnetization

It high retentivity

Molecular friction

TRUE ANSWER : ?
YOUR ANSWER : ?

The rate of rise of current through an inductive coil is maximum

After one time constant

At 63.2% of its maximum steady value

At the start of the current flow

Near the final maximum value of current

TRUE ANSWER : ?
YOUR ANSWER : ?

When both the inductance and resistance of a coil are doubled the value of

Initial rate of rise of current is doubled

Time constant remains unchanged

Final steady current is doubled

Time constant is halved

TRUE ANSWER : ?
YOUR ANSWER : ?

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