Electronics MCQ Question and Answer
Electronics MCQ Question and Answer
1. For a common emitter circuit if IC/IE = 0.98 then current gain for common emitter circuit will be
- 49
- 98
- 4.9
- 25.5
2. In a p-n junction
- The potential of the p and n sides becomes higher alternately
- The p side is at higher electrical potential than the n side
- The n side is at higher electrical potential than the p side
- Both the p and n sides are at the same potential
3. In the case of a common emitter transistor amplifier the ratio of the collector current to the emitter current Ic/Ie is 0.96. The current gain of the amplifier is ?
- 6
- 48
- 24
- 12
4. if a full wave rectifier circuit is operating from 5oHz mains, the fundamental frequency in the
tipple will be
tipple will be
- 100Hz
- 25Hz
- 50Hz
- 70.7 Hz
5. A n-p-n transistor conducts when ?
- both collector and emitter are negative with respect to, the base
- both collector and emitter are positive with respect to the base
- collector is positive and emitter is negative with to the base
- collector is positive and emitter is at same potential as the base
6. Barrier potential of a p-n junction diode does not depend on?
- doping density
- diode design
- temperature
- forward bias
7. Reverse bias applied to a junction diode
- increases the minority carrier current
- lowers the potential barrier
- raises the potential barrier
- increases the majority carrier current
8. In semiconductors at a room temperature
- the conduction band is completely empty
- the valence band is partially empty and the conduction band is partially filled
- the valence band is completely filled and the conduction band is partially filled
- the valence band is completely filled
9. The output of OR gate is 1 when?
- if either input is zero
- if both inputs are zero
- if either or both inputs are 1
- only if both inputs are I
10. In a p-n junction photo cell, the value of the photo-electromotive force produced by monochromatic light is proportional to ?
- the voltage applied at the p-n junction
- the barrier voltage at the p-n junction
- the intensity of the light falling on the cell
- the frequency of the light falling on the cell