The value of resistivity for insulator is of the order of:
A. 105 ohm metre
B. 106 ohm metre
C. 107 ohm metre
D. 108 ohm metre
Which one of following band is completely filled in case of conductors:
A. Conduction band
B. Fermi band
C. Valence band
D. Forbidden band
In p-n-p transistor the collector current is:
A. equal to emitter current
B. slightly less than emitter current
C. greater than emitter current
D. any of above
Semi-conductors with donor atoms and free electrons belong to the type:
A. n
B. p
C. mix
D. any of above
The device or circuit used for conversion of A.C. into D.C. is called:
A. An amplifier.
B. A rectifier
C. Filtering circuit
D. Converter.
In the transistor schematic symbol, the arrow:
A. is located on the emitter
B. is located on the base
C. is locate on the collector
D. points form north to south
Thermions are:
A. protons
B. positrons
C. electrons
D. photons
Which one of the following has the greatest energy gap:
A. insulator
B. conductor
C. semi conductor
D. any of above
In n-p-n transistor, p works as:
A. collector
B. emitter
C. base
D. any of above
p-n junction when reversed biased acts as a:
A. capacitor
B. inductor
C. on switch
D. off switch
