MAGNETIC CIRCUIT QUIZ

The unit of retentivity is

Weber

Weber/sq. m

Ampere turn/meter

Ampere turns

TRUE ANSWER : ?
YOUR ANSWER : ?

A material for good magnetic memory should have

Low hysteresis loss

High retentivity

High permeability

Low retentivity

TRUE ANSWER : ?
YOUR ANSWER : ?

Hysteresis loss least depends on

Steinmetz’s coefficient of material

Volume of material

Ambient temperature

Frequency

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Resistivity

Conductance

Conductivity

Resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be

Large

Zero

Small

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Energy stored by a coil is doubled when its current is increased by percent.

41.4

47.5

44.6

42.5

TRUE ANSWER : ?
YOUR ANSWER : ?

The unit of reluctance is

Henry/meter

1/Henry

Henry

Meter/Henry

TRUE ANSWER : ?
YOUR ANSWER : ?

Those materials are well suited for making permanent magnets which have retentivity and coercivity.

High, high

Low, high

Low, low

High, low

TRUE ANSWER : ?
YOUR ANSWER : ?

Relative permeability of vacuum is

6

5

3

1

TRUE ANSWER : ?
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

TRUE ANSWER : ?
YOUR ANSWER : ?

↑