Electron Devices Objective Type Questions
2.When a sample of germanium and silicon having same impurity density are kept at room temperature then?
3.When an RC driving point impedance function has zeros at s= -2 and s=-5 then the admissible poles for the function would be?
4.A transistor has CE parameter as hie = 10kW, hre=20 x 10-4 , hse = 100, hoe = 25 ms. The hib for this transistor will be-
5.Which one of the following conditions for Z parameters would hold for a two port network containing linear bilateral passive circuit elements?
6.A transistor is in active region when-
7.In a JFET gates are always?
8.In schotty barrier diode current flows because of?
9.The early voltage of a BJT is VA = 75V. The minimum required collector current, such that the output resistance is at least r0 = 200kΩ, is
10.TVS diode is used for
(b) Current protection
(c) ESD protection
(d) None of the above
 Alternatively the characteristic impedance is called
a) Surge Impedance
b) Match Impedance
c) Alternative Impedance
d) Reflected Impedance
 In an RL circuit after a very long time of application of step voltage the inductance L is represented in its equivalent circuit as Incorrect!
b) Short Circuit
c) L / 2
 By passing a triangular wave through a differentiating circuit the output wave shape is
 Clipper circuits are used to obtain any one of the following waveforms
c) Fast Rising
d) Smaller Amplitude
 When the temperature increases, the resistance of conductor(copper) decreases and resistance of semiconductor(germanium) increases
 In the FET, the gate terminal is electrically isolated from the channel. ie, it is always unbiased.
 TVS stands for Transient Voltage suppressor. It is used for transient voltage protection.
 The clipper circuit will clip part of the waveform. so it can be used for smaller amplitude of the waveform.