Electrical Engineering Materials

41. Most of the common metals have _________ structure.

1. linear
2. hexagonal
3. orthorhombic
4. cubic

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42. Non-linear resistors

1. produce harmonic distortion
2. follows Ohm’s law at low temperatures only
3. result in non-uniform heating
4. none of the above

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43. On which of the following factors does the resistivity of a material depend?

1. Resistance of the conductor
2. Area of the conductor section
3. Length of the conductor
4. All of the above

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44. Overhead telephone wires are made of

1. aluminium
2. steel
3. ACSR conductors
4. copper

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45. Piezoelectric materials serve as a source of _________ .

1. resonant waves
2. musical waves
3. microwaves
4. ultrasonic waves

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46. Platinum is used in

1. electrical contacts
2. thermocouple
3. heating element in high temperature furnace
4. grids of special purpose vacuum tubes
5. all of the above

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47. s viscoelastic.

1. Cast-iron
2. Graphite
3. Rubber
4. Glass

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48. Selenium is _________ semiconductor.

1. extrnisic
2. intmisic
3. N-type
4. P-type

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49. Solder is an alloy of

1. copper and aluminium
2. tin and lead
3. nickel, copper and zinc
4. silver, copper and lead

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50. Spark plug makes use of which of the following materials for insulation?

1. Porcelain
2. Slate
3. Asbestos
4. Glass

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