MATERIALS AND COMPONENTS QUIZ

The unit for mmf is

Wb

T

A

V

TRUE ANSWER : ?
YOUR ANSWER : ?

At room temperature the number of conducting electrons in an intrinsic semiconductor

Is small as compared to the number of valence electrons

Is about half the number of valence electrons

Is almost equal to the number of valence electrons

Is a very small fraction of the number of valence electrons

TRUE ANSWER : ?
YOUR ANSWER : ?

A vacant electronic state moves in the same direction as would a positive charge carrier.

False

True

TRUE ANSWER : ?
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A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

The dielectric losses do not depend on frequency.

False

True

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Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

Normal to both current and magnetic field

In a direction anti parallel to magnetic field

None of these

In the same direction as current

TRUE ANSWER : ?
YOUR ANSWER : ?

As the viscosity of a liquid increases, the relaxation time

First decreases then increases

Increases

Remains constant

Decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

Nickel is a non-magnetic material.

True

False

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YOUR ANSWER : ?

Which inductor is used at high frequencies?

Sheet steel cored

Iron alloy cored

Cast iron cored

Ceramic cored

TRUE ANSWER : ?
YOUR ANSWER : ?

In van der walls crystals, there exists a high degree of stability of the outer electron shell.

False

True

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