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Magnetic Circuit

Study 28 Electrical Engineering MCQs with correct answers and explanations.

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21Electrical EngineeringMedium

Conductivity is analogous to________?

Apermeability

Bresistivity

Cinductance

Dretentivity

Correct answer

A. permeability

Explanation

The correct answer is permeability.

22Electrical EngineeringMedium

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

Ainitial rate of rise of current is doubled

Btime constant remains unchanged

Cfinal steady current is doubled

Dtime constant is halved

Correct answer

B. time constant remains unchanged

Explanation

The correct answer is time constant remains unchanged.

23Electrical EngineeringMedium

The unit of reluctance is________?

Ahenry

B1/henry

Chenry/metre

Dmetre/henry

Correct answer

B. 1/henry

Explanation

The correct answer is 1/henry.

24Electrical EngineeringMedium

Permanent magnets are normally made of________?

Aalnico alloys

Baluminium

Cwrought iron

Dcast iron

Correct answer

A. alnico alloys

Explanation

The correct answer is alnico alloys.

25Electrical EngineeringMedium

Those magnetic materials are best suited for making armature and transformer cores which have permeability and hystersis loss

Alow, high

Blow, low

Chigh, low

Dhigh, high

Correct answer

C. high, low

Explanation

The correct answer is high, low.

26Electrical EngineeringMedium

Silicon steel is used in electrical machines because it has________?

Alow coercivity

Blow hysteresis loss

Clow retentivity

Dhigh coercivity

Correct answer

B. low hysteresis loss

Explanation

The correct answer is low hysteresis loss.

27Electrical EngineeringMedium

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

Alarge

Bzero

Cnone of the above

Dsmall

Correct answer

A. large

Explanation

The correct answer is large.

28Electrical EngineeringMedium

Energy stored by a coil is doubled when its current is increased by percent________?

A100

B25

C41.4

D50

Correct answer

C. 41.4

Explanation

The correct answer is 41.4.

21Electrical EngineeringMedium

Conductivity is analogous to________?

Apermeability

Bresistivity

Cinductance

Dretentivity

Correct answer

A. permeability

Explanation

The correct answer is permeability.

22Electrical EngineeringMedium

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

Ainitial rate of rise of current is doubled

Btime constant remains unchanged

Cfinal steady current is doubled

Dtime constant is halved

Correct answer

B. time constant remains unchanged

Explanation

The correct answer is time constant remains unchanged.

23Electrical EngineeringMedium

The unit of reluctance is________?

Ahenry

B1/henry

Chenry/metre

Dmetre/henry

Correct answer

B. 1/henry

Explanation

The correct answer is 1/henry.

24Electrical EngineeringMedium

Permanent magnets are normally made of________?

Aalnico alloys

Baluminium

Cwrought iron

Dcast iron

Correct answer

A. alnico alloys

Explanation

The correct answer is alnico alloys.

25Electrical EngineeringMedium

Those magnetic materials are best suited for making armature and transformer cores which have permeability and hystersis loss

Alow, high

Blow, low

Chigh, low

Dhigh, high

Correct answer

C. high, low

Explanation

The correct answer is high, low.

26Electrical EngineeringMedium

Silicon steel is used in electrical machines because it has________?

Alow coercivity

Blow hysteresis loss

Clow retentivity

Dhigh coercivity

Correct answer

B. low hysteresis loss

Explanation

The correct answer is low hysteresis loss.

27Electrical EngineeringMedium

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

Alarge

Bzero

Cnone of the above

Dsmall

Correct answer

A. large

Explanation

The correct answer is large.

28Electrical EngineeringMedium

Energy stored by a coil is doubled when its current is increased by percent________?

A100

B25

C41.4

D50

Correct answer

C. 41.4

Explanation

The correct answer is 41.4.

Magnetic Circuit

Conductivity is analogous to________?

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

The unit of reluctance is________?

Permanent magnets are normally made of________?

Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss

Silicon steel is used in electrical machines because it has________?

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

Energy stored by a coil is doubled when its current is increased by percent________?

Magnetic Circuit

Conductivity is analogous to________?

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

The unit of reluctance is________?

Permanent magnets are normally made of________?

Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss

Silicon steel is used in electrical machines because it has________?

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

Energy stored by a coil is doubled when its current is increased by percent________?

Those magnetic materials are best suited for making armature and transformer cores which have permeability and hystersis loss

Those magnetic materials are best suited for making armature and transformer cores which have permeability and hystersis loss