MCQs – Electronic Devices and circuit
1. The acceptor type of impurity is
- Phosphor
- boron
- Freon
- None of these
2. The potential barrier acts as an barrier against the flow of
- electrons only
- holes only
- electrons and holes
- None of these
3. The maximum efficiency of a half -wave rectifier is
- 33.33%
- 40.6%
- 50%
- 68%
4. The pick inverse voltage in case of a bridge rectifier circuit for each diode is
- Em
- 2Em
- 3Em
- 4Em
5. The arrow in a transistor symbol indicates the direction of current in
- base
- collector
- emitter
- None of these
6. The input resistence of a common base transistor circuit is of the order of
- 0 ohm
- 50-100 ohm
- 100-150 ohm
- 150-200 ohm
7. The common emitter transistor circuit has
- high gain
- low gain
- negligible gain
- zero gain
8. The biasing that provides good stability of the operation point but fails to provide good amplification is said to be
- fixed bias
- collector to base bias
- self bias
- collector to emitter bias
9.Transformer coupling is used to cascade two such stages of which the first has
- high collector impedance and succeeding has low input impedance
- low collector impedance and succeeding has high input impedance
- low collector impedance and succeeding has high input impedance
- high collector impedance and succeeding has high input impedance
10. A push-pull amplifier has a maximum efficiency of
- 25%
- 33.33%
- 8%
- 100%