81. If α = o.995, IE =10mA and ICO=0.5 μA, then ICEO will be
- 100 μA
- 25 μA
- 10.1 μA
- 10.5 μA
82. What does the discharge transistor do in the 555 timer circuit?
- Discharge the external capacitor to stop the timing
- Charge the external capacitor to stop the timing
- Discharge the external capacitor to start the timing over again
- Charge the external capacitor to start the timing over again
83. Transistors leakage current mainly depends on
- Doping of base
- Size of emitter
- Rating of transistor
- Temperature
84. Transistors are
- Low voltage & low current device
- High voltage & high current device
- Low voltage and high current device
- Only low current device
85. How much is the base-to-emitter voltage of a transistor in the ‘ON’ state?
- Undefined
- 0.7 V
- 0 V
- 0.7 mV
86. A transistor connected in common base configuration has
- A high input resistance and low output resistance
- A high input resistance and high output resistance
- A low input resistance and high output resistance
- A low input resistance and low output resistance
87. In a PNP transistor, electrons flow
- Out of the transistor, at the collector and base leads
- Out of the transistor, at the emitter and base leads
- Into the transistor, at the emitter and base leads
- Into the transistor, at the collector and base leads
88. The current gain of a Darlington pair in common emitter configuration is approximately
- β2
- 1+β/1-β
- β/1+β
- 2β
89. The h-parameter equivalent circuit of a BJT is valid for
- Large signal operation at high frequencies
- Small signal operation at low frequencies
- Large signal operation at low frequencies
- Small signal operation at high frequencies
90. Of the three BJT configurations CB, CE and CC
- CB does not have miller effect hence higher bandwidth
- CC has smallest bandwidth
- CB exhibits reduction in bandwidth due to miller effect
- CE exhibits increase in bandwidth due to miller effect.