In a transistor circuit shown here, the base current is
1. 128.5 k
2. 257 k
3. 380.05 k
4. None of these
In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the collector current. What change in the base current is necessary to produce the same change in the collector current?
1. 50 A
2. 100 A
3. 150 A
4. 200 A
An NPN transistor conducts when:
1. | both the collector and the emitter are positive with respect to the base. |
2. | the collector is positive and the emitter is negative with respect to the base. |
3. | the collector is positive and the emitter is at same potential as the base. |
4. | both the collector and the emitter are negative with respect to the base. |
In a common emitter circuit, if VCC is changed by 0.2 V, collector current changes by 4 x 10–3 mA. The output resistance will be:
1. 10 k
2. 30 k
3. 50 k
4. 70 k
In a common emitter amplifier, the phase difference between input signal and output signal is:
1. zero
2.
3.
4.
In an NPN transistor amplifier, if 98% of electrons emitted from the emitter reach the collector, then the value of collector current for the base current of 40 A will be:
1. 1.96 mA
2. 1.92 mA
3. 1.96 A
4. 1.92 A
A transistor is operated in a common emitter configuration at constant collector voltage Vc = 1.5 V such that a change in the base current from 100 μA to 150 μA produces a change in the collector current from 5 mA to 10 mA. The current gain (β) is:
1. 67
2. 75
3. 100
4. 50
The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be:
1. 90
2. 10
3. 1.25
4. 100
A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 200 Ω. The power gain of the amplifier is:
1. 500
2. 1000
3. 1250
4. 50