Magnetism & Electromagnetism Mcqs - Set 3

1)   The use of permanent magnets is. not made in_____________?

a. magnetoes
b. energy meters
c. transformers
d. loud-speakers
Answer  Explanation 

ANSWER: transformers

Explanation:
No explanation is available for this question!


2)   Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of_________________?

a. 2 x 1(T2 N/m)
b. 2 x KT3 N/m
c. 2 x 10″5 N/m
d. 2x 1(T7 N/m)
Answer  Explanation 

ANSWER: 2x 1(T7 N/m)

Explanation:
No explanation is available for this question!


3)   The main constituent of permalloy is_____________?

a. cobalt
b. chromium
c. nickel
d. tungsten
Answer  Explanation 

ANSWER: nickel

Explanation:
No explanation is available for this question!


4)   Paramagnetic materials have relative permeability________________?

a. slightly less than unity
b. equal to unity
c. slightly more than unity
d. equal to that ferromagnetic mate rials
Answer  Explanation 

ANSWER: slightly more than unity

Explanation:
No explanation is available for this question!


5)   Gilbert is a unit of_______________?

a. electromotive force
b. magnetomotive force
c. conductance
d. permittivity
Answer  Explanation 

ANSWER: magnetomotive force

Explanation:
No explanation is available for this question!


6)   Substances which have permeability less than the permeability of free space are known as_____________?

a. ferromagnetic
b. paramagnetic
c. diamagnetic
d. bipolar
Answer  Explanation 

ANSWER: diamagnetic

Explanation:
No explanation is available for this question!


7)   In the left hand rule, forefinger always represents______________?

a. voltage
b. current
c. magnetic field
d. direction of force on the conductor
Answer  Explanation 

ANSWER: magnetic field

Explanation:
No explanation is available for this question!


8)   Ferrites are a sub-group of_______________?

a. non-magnetic materials
b. ferro-magnetic materials
c. paramagnetic materials
d. ferri-magnetic materials
Answer  Explanation 

ANSWER: ferri-magnetic materials

Explanation:
No explanation is available for this question!


9)   Reciprocal of permeability is____________?

a. reluctivity
b. susceptibility
c. permittivity
d. conductance
Answer  Explanation 

ANSWER: reluctivity

Explanation:
No explanation is available for this question!


10)   Which of the following is the unit of magnetic flux density ?

a. weber
b. lumens
c. tesla
d. none of the above
Answer  Explanation 

ANSWER: tesla

Explanation:
No explanation is available for this question!