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Magnetism and Electromagnetism

Study 85 Electrical Engineering MCQs with correct answers and explanations.

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61Electrical EngineeringMedium

A permanent magnet________?

Aattracts all paramagnetic substances and repels others

Battracts ferromagnetic substances and repels all others

Cattracts only ferromagnetic substances

Dattracts some substances and repels others

Correct answer

D. attracts some substances and repels others

Explanation

The correct answer is attracts some substances and repels others.

62Electrical EngineeringMedium

The relative permeability is less than unity is case of________?

Adiamagnetic materials

Bferrites

Cnon-ferrous materials

Dferromagnetic materials

Correct answer

A. diamagnetic materials

Explanation

The correct answer is diamagnetic materials.

63Electrical EngineeringMedium

Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be________?

A1 N

B10 N

C0.1 N

D100 N

Correct answer

C. 0.1 N

Explanation

The correct answer is 0.1 N.

64Electrical EngineeringMedium

When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon________?

Apole strength of the magnet

Bresistance of the coil

Cnumber of turns of the coil

Dmotion of the magnet

Correct answer

B. resistance of the coil

Explanation

The correct answer is resistance of the coil.

65Electrical EngineeringMedium

When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?

Awill depend on the radius of the circle

Bwill be infinite

Cwill depend on the amount of e.m.f. applied

Dwill be zero

Correct answer

A. will depend on the radius of the circle

Explanation

The correct answer is will depend on the radius of the circle.

66Electrical EngineeringMedium

Which of the following is a ferromagnetic material?

ACopper

BNickel

CAluminium

DTungsten

Correct answer

B. Nickel

Explanation

The correct answer is Nickel.

67Electrical EngineeringMedium

The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is________?

Aproportional to distance between the conductors

Bproportional to 7

Cinversely proportional to I

Dproportional to X

Correct answer

D. proportional to X

Explanation

The correct answer is proportional to X.

68Electrical EngineeringMedium

A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air?

A63380 N/Wb

B63.38 N/Wb

C6338 N/Wb

D633.8 N/Wb

Correct answer

C. 6338 N/Wb

Explanation

The correct answer is 6338 N/Wb.

69Electrical EngineeringMedium

The left hand rule correlates to________?

Amagnetic field, electric field and direction of force on a conductor

Bcurrent, induced e.m.f. and direction of force on a conductor

Ccurrent, magnetic field and direction of force on a conductor

Dself induction, mutual induction and direction of force on a conductor

Correct answer

C. current, magnetic field and direction of force on a conductor

Explanation

The correct answer is current, magnetic field and direction of force on a conductor.

70Electrical EngineeringMedium

Which of the following statements is correct?

AThe conductivity of ferromagnetic materials is better than ferrites

BThe conductivity of ferrites is very high

CThe conductivity of ferrites is same as that of ferromagnetic materials

DThe conductivity of ferrites is better than ferromagnetic materials

Correct answer

A. The conductivity of ferromagnetic materials is better than ferrites

Explanation

The correct answer is The conductivity of ferromagnetic materials is better than ferrites.

A permanent magnet________?

Aattracts all paramagnetic substances and repels others

Battracts ferromagnetic substances and repels all others

Cattracts only ferromagnetic substances

Dattracts some substances and repels others

Correct answer

D. attracts some substances and repels others

Explanation

The correct answer is attracts some substances and repels others.

The left hand rule correlates to________?

Amagnetic field, electric field and direction of force on a conductor

Bcurrent, induced e.m.f. and direction of force on a conductor

Ccurrent, magnetic field and direction of force on a conductor

Dself induction, mutual induction and direction of force on a conductor

Correct answer

C. current, magnetic field and direction of force on a conductor

Explanation

The correct answer is current, magnetic field and direction of force on a conductor.

Which of the following statements is correct?

AThe conductivity of ferromagnetic materials is better than ferrites

BThe conductivity of ferrites is very high

CThe conductivity of ferrites is same as that of ferromagnetic materials

DThe conductivity of ferrites is better than ferromagnetic materials

Correct answer

A. The conductivity of ferromagnetic materials is better than ferrites

Explanation

The correct answer is The conductivity of ferromagnetic materials is better than ferrites.