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.Management Sciences
Category: Electrical Engineering Materials
The structure sensitive property of a super conductor is______________?
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A. critical magnetic field
B. transition temperature
C. critical current density
D. none of the above
___________ has the best damping properties?
A. Diamond
B. High speed steel
C. Mild steel
D. Cast iron
If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as____________?
A. non-linear conductor
B. reverse conductor
C. bad-conductor
D. non-conductor
In a superconductor the value of critical density depends upon______________?
A. magnetic field strength
B. temperature
C. either (A) or (B)
D. both (A) and (B)
Carbon electrodes are not used in_______________?
A. GLS lamps
B. electric arc furnace
C. dry cells
D. cinema projectors
For a hole which of the following statements is incorrect ?
A. Holes can exist in certain semiconductors only
B. Holes can exist in any material including conductors
C. Holes may constitute an electric current
D. Holes can be considered as a net positive charge
Which of the following is the poorest conductor of electricity ?
A. Carbon
B. Steel
C. Silver
D. Aluminium
Solder is an alloy of______________?
A. copper and aluminium
B. tin and lead
C. nickel, copper and zinc
D. silver, copper and lead
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