Electrical Engineering Mcqs Practice Test

Question 1

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

Accepted Answer

A. resistance of the coil

Question 2

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

Accepted Answer

D. will depend on the radius of the circle

Question 3

A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?

Accepted Answer

C. 2.4 N

Question 4

The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?

Accepted Answer

B. 250 AT/m

Question 5

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_____________?

Accepted Answer

D. 0.1 N

Question 6

A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________?

Accepted Answer

C. 0.048 N-m

Question 7

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 ?

Accepted Answer

C. 6338 N/Wb

Question 8

Unit for quantity of electricity is_____________?

Accepted Answer

D. coulomb

Question 9

What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

Accepted Answer

D. 22 x 10″5 N

Question 10

The unit of flux is the same as that of_______________?

Accepted Answer

D. pole strength

Question 11

The commonly used material for shielding or screening magnetism is____________?

Accepted Answer

C. soft iron

Question 12

The Biot-savart’s law is a general modification of_______________?

Accepted Answer

C. Ampere’s law

Question 13

If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?

Accepted Answer

D. less than that of disc and in the same direction

Question 14

What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?

Accepted Answer

B. 4

Question 15

The materials are a bit inferior conductors of magnetic flux than air

Accepted Answer

C. diamagnetic

Question 16

he retentivity (a property) of material is useful for the construction of__________?

Accepted Answer

A. permanent magnets

Question 17

he retentivity (a property) of material is useful for the construction of_______________?

Accepted Answer

A. permanent magnets

Question 18

A permanent magnet______________?

Accepted Answer

A. attracts some substances and repels others

Question 19

The relative permeability of materials is not constant

Accepted Answer

C. ferromagnetic

Question 20

A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?

Accepted Answer

B. M/2