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.Management Sciences
Category: Electrical Engineering Materials
The conductivity of an extrinsic semiconductor with temperature________________?
A. decreases
B. increases
C. remains constant
Non-linear resistors______________?
A. produce harmonic distortion
B. follows Ohm’s law at low temperatures only
C. result in non-uniform heating
D. none of the above
On which of the following factors does the resistivity of a material depend ?
A. Resistance of the conductor
B. Area of the conductor section
C. Length of the conductor
D. All of the above
Thermocouples are mainly used for the measurement of_____________?
A. temperature
B. resistance
C. eddy currents
D. coupling co-efficient
In a crystal, an atom vibrates at a frequency determined by_______________?
A. the heat content of the crystal
B. the temperature of the crystal
C. the stiffness of the bonds it makes with neighbors
Superconducting metal in super conducting state has relative permeability of________________?
A. zero
B. one
C. negative
D. more than one
The value of critical field below the transition temperature will_______________?
A. increase
B. decrease
C. remain unchanged
D. any of the above
Superconductivity is observed for____________?
A. infrared frequencies
B. d.c. and low frequency
C. a.c. and high frequency
D. frequencies having no effect
E. none of the above
The kinetic energy of a bounded electron is______________?
A. less than that of unbounded electron
B. greater than that of unbounded electron
C. equal to that of unbounded electron
D. infinite
E. none of the above
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