Electrical Engineering Materials

91. Which of the following is an advantage of stranded conductor over equivalent single conductor?

1. Less liability to kink
2. Greater flexibility
3. Less liability to break
4. All of the above

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92. Which of the following is the poorest conductor of electricity?

1. Carbon
2. Steel
3. Silver
4. Aluminium

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93. Which of the following material is not a semiconductor?

1. Silica
2. Germanium
3. Selenium
4. Gallium-arsenide

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94. Which of the following materials does not have covalent bonds?

1. Organic polymers
2. Silicon
3. Metals
4. any of the above

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95. Which of the following materials is preferred for transmitting electrical energy over long distance?

1. Copper
2. Aluminium
3. Steel reinforced copper
4. Steel reinforced aluminium

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96. Which of the following materials is the best conductor of electricity?

1. Tungsten
2. Aluminium
3. Copper
4. Carbon

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97. Which of the following materials is used for making coils of standard resistances?

1. Copper
2. Nichrome
3. Platinum
4. Manganin

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98. Which of the following resistive materials has the lowest temperature co- efficient of resistance?

1. Nichrome
2. Constantan
3. Kanthal
4. Molybdenum

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99. Which of the following variety of copper has the best conductivity?

1. Induction hardened copper
2. Hard drawn copper
3. Pure annealed copper
4. Copper containing traces of silicon

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