QUANTITIES AND UNITS QUIZ

ALNICO is an alloy of

iron, aluminium.

iron, cobalt, nickel.

aluminium, nickel.

aluminium, nickel, iron and cobalt.

TRUE ANSWER : ?
YOUR ANSWER : ?

________ is the most detrimental impurity in the magnetic materials

Carbon.

Oxygen.

Nitrogen.

Sulphur.

TRUE ANSWER : ?
YOUR ANSWER : ?

A ferromagnetic core subjected to cycles of magnetisation will exhibit hysteresis when the cycle is

rotating.

alternating.

/ >(A), (B), and (C) are all correct.

pulsating.

TRUE ANSWER : ?
YOUR ANSWER : ?

The atomic radius in case of face centered cubic lattice is

a / 2.

a.

a / 4.

a / 3.

TRUE ANSWER : ?
YOUR ANSWER : ?

When will be the electron pair bonding occurs ?

Share electrons

Lack holes

Share holes

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

How many classes of insulating materials are there?

6.

8.

5.

7.

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnetic recording tape is most commonly made from

silicon-iron.

iron-dust.

small particles of iron.

ferric-oxide.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the example for piezo-electric material ?

Potassium niobate

Copper

None of these

Lead zirconate titanate

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following gives materials in order of decreasing values of permeability?

Silver, copper, aluminium, iron.

Permalloy, nickel, air, water.

Cobalt, nickel, aluminium, iron.

Pure iron, silicon iron, aluminium, bismuth.

TRUE ANSWER : ?
YOUR ANSWER : ?

In order to minimise loss due to hysteresis, the magnetic material should have

high retentivity.

large B-H loop area.

low hysteresis coefficient.

high resistivity.

TRUE ANSWER : ?
YOUR ANSWER : ?

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