Magnetic Circuits Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Magnetic Circuits ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Magnetic Circuits comprehensively.

1. Hysteresis loss least depends on____________?

Volume of material

Frequency

Steinmetz coefficient of material

Ambient temperature

Metre/henry

Henry/metre

Henry

1/henry

Reluctivity

Permeance

Permeability

Susceptibility

4. The property of a material which opposes the creation of magnetic flux in it is known as_____________?

Reluctivity

Magnetomotive force

Permeance

Reluctance

5. Silicon steel is used in electrical machines because it has_____________?

Low coercivity

Low retentivity

Low hysteresis loss

High coercivity

6. A ferrite core has less eddy current loss than an iron core because_______________?

Ferrites have high resistance

Ferrites are magnetic

Ferrites have low permeability

Ferrites have high hysteresis

7. Laminated cores, in electrical machines, are used to reduce____________?

Copper loss

Eddy current loss

Hysteresis loss

All of the above

E.m.f.

Current

Current density

Conductivity

9. The unit of retentivity is____________?

Weber

Weber/sq. m

Ampere turn/meter

Ampere turn

Permeance

Reluctance

Flux

Inductance

11. Hard steel is suitable for making permanent magnets because_____________?

It has good residual magnetism

Its hysteresis loop has large area

Its mechanical strength is high

Its mechanical strength is low

Low, high

High, high

High, low

Low, low

Retentivity

Resistivity

Permeability

Inductance

14. When both the inductance and resistance of a coil are doubled the value of________________?

Time constant remains unchanged

Initial rate of rise of current is doubled

Final steady current is doubled

Time constant is halved

25

50

41.4

100

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