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.Management Sciences
Category: Electrical Engineering Materials
Overhead telephone wires are made of_____________?
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A. aluminium
B. steel
C. ACSR conductors
D. copper
Which of the following materials does not have covalent bonds ?
A. Organic polymers
B. Silicon
C. Metals
Which of the following materials is preferred for transmitting electrical energy over long distance ?
A. Copper
B. Aluminium
C. Steel reinforced copper
D. Steel reinforced aluminium
The metal having the lowest temperature coefficient of resistance is_________________?
A. gold
B. copper
C. aluminium
D. kanthal
A good electric contact material should have all of the following properties except_____________?
A. high resistivity
B. high resistance to corrosion
C. good thermal conductivity
D. high melting point
Which of the following variety of copper has the best conductivity ?
A. Induction hardened copper
B. Hard drawn copper
C. Pure annealed copper
D. Copper containing traces of silicon
The minority carrier concentration is largely a function of_____________?
A. forward biasing voltage
B. reverse biasing voltage
C. temperature
D. the amount of doping
By increasing impurity content in the metal alloy the residual resistivity always_____________?
A. decreases
B. increases
C. remains constant
D. becomes temperature independent
High resistivity materials are used in_____________?
A. precision instruments
B. heating elements
C. motor starters
D. incandescent lamps
E. all of the above
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