Dielectric Materials – 1 – 1

1. On introducing a dielectric medium in between the plates of a capacitor, one of the following quantities will not change :

(a) Charge storing capacity
(b) Potential difference
(c) Electric field strength
(d) Electric flux density

ANSWER
Answer : (d)

EXPLANATION
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2. Exposure of insulating material to moisture causes an increase in :

(a) Dielectric loss
(b) Dielectric constant
(c) Dielectric strength
(d) Insulation resistance

ANSWER
Answer : (a)

EXPLANATION
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3. Dielectric materials are essentially :

(a) Insulating materials
(b) Ferro-electric materials
(c) Ferri-electric materials
(d) Superconducting materials

ANSWER
Answer : (a)

EXPLANATION
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4. On placing a dielectric in an electric field, the field strength :

(a) Increases
(b) Decreases
(c) Remains constant
(d) Reduces to zero

ANSWER
Answer : (b)

EXPLANATION
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5. Dielectric constant relates to :

(a) Comparative charge stored for a given material versus air
(b) The fact that the dielectric doesn’t have charge characteristics
(c) The insulating properties of the non-conducting mediums
(d) None of the above

ANSWER
Answer : (a)

EXPLANATION
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