Search
.Management Sciences
Category: Electrical Engineering Materials
The impurity atoms is semiconductors_____________?
A. inject more charge carriers
B. reduce the energy gap
C. increase the kinetic energy of valence electrons
D. all of the above
Piezoelectric materials serve as a source of ____________ ?
A. resonant waves
B. musical waves
C. microwaves
D. ultrasonic waves
Due to which of the following reasons copper and aluminium are not used for heating elements ?
A. Both have great tendency for oxidation
B. Both have low melting point
C. Very large length of wires will be required
D. All of the above
is the property of absorbing moisture from atmosphere_____________?
A. Solubility
B. Viscosity
C. Porosity
D. Hygroscopicity
The tiny block formed by the arrangement of a small group of atoms is called the____________?
A. unit cell
B. space lattice
C. either A. or (b)
D. none of the above
At transition temperature the value of critical field is____________?
A. zero
B. negative real value
C. positive real value
D. complex value
Constantan contains_______________?
A. silver and tin
B. copper and tungsten
C. tungsten and silver
D. copper and nickel
A carbon resistor contains_____________?
A. carbon crystals
B. solid carbon granules
C. pulverized coal
D. finely divided carbon black
Which of the following materials is used for making coils of standard resistances ?
A. Copper
B. Nichrome
C. Platinum
D. Manganin
Recent Comments