Magnetic Materials – 1 – 1

1. The covers of electrical machines are made of :

(a) soft magnetic materials
(b) hard magnetic materials
(c) super conductors
(d) semiconductors

ANSWER

EXPLANATION

2. The critical temperature above which the ferromagnetic materials loose their magnetic property is known as :

(a) hysterisis
(b) Curie point
(c) transition temperature
(d) standard temperature

ANSWER

EXPLANATION

3. Permanent magnets are made of :

(a) soft magnetic materials
(b) hard magnetic materials
(c) semi conductors
(d) super conductors

ANSWER

EXPLANATION

4. Materials, which provide a path to the magnetic flux, are classified as :

(a) insulating materials
(b) semi conducting materials
(c) magnetic materials
(d) dielectric materials

ANSWER

EXPLANATION

5. Ferrites are :

(a) ferromagnetic material
(b) ferrimagnetic materials
(c) anti ferromagnetic material
(d) diamagnetic materials

ANSWER

EXPLANATION

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