a) Inner electrons are always present in the semiconductor. b) Bound electrons are always present in the semiconductor. c) Free electrons are always present in the semiconductor. d) Inner and bound electrons are always present in the semiconductor. Ans: (d)
a) More electrons than holes b) More protons than holes c) More holes than electrons d) Electrons equal holes Ans: (d)
a) Because they are negatively charged b) Because they can contribute to current flow in certain situations c) Because they can produce bonds with other atoms d) Because they make covalent bonds Ans: (b)
a) The inner electrons of the atoms b) The valence electrons that are in outer shells of atoms c) (a) and (b) both d) All the electrons irrespective of location Ans: (b)
a) Dynamic resistance of diode b) Static resistance of diode c) (a) and (b) both d) Reverse resistance Ans: (b)
a) Dynamic resistance b) Static resistance c) Reverse resistance d) None of the above Ans: (a)
a) Increase b) Decrease c) Remain constant d) Increase proportional to applied voltage Ans: (b)
a) In forward direction b) In reverse direction c) In either forward or reverse direction d) In both direction depending on the polarity of applied voltage Ans: (a)
a) The diodes shall be connected in series b) The diodes shall be connected in parallel c) Some diodes in series and a few in parallel d) Such above combinations are not possible and only single diode shall be used of the rated voltage Ans: (a)
a) Tunnel diodes b) Zener diodes c) Varactors d) Varicaps e) Voltacaps f) (c) or (d) or (e) Ans: (f)
a) Drift b) Diffusion c) Conductivity d) Resistivity e) Conductivity or resistivity Ans: (c)
a) Collector multiplication ratio is zero b) Collector multiplication ratio is positive c) Collector multiplication ratio is negative d) Collector multiplication ratio is unity Ans: (d)
a) Current amplification b) Voltage amplification c) Power amplification d) Current, voltage and power amplification Ans: (d)
a) The collector and the emitter junction are biased in the forward direction b) The collector junction is biased in the forward direction and the emitter junction is biased in reverse direction c) The collector junction is biased in reverse direction and emitter junction is biased in forward direction d) The collector and emitter junction are biased in reverse direction Ans: (c)
a) Cut-off region b) Action region c) Saturation region d) Either of the above Ans: (b)