Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

An amplifier without feedback has a voltage gain of 50, input resistance of 1 kΩ and output resistance of 2.5 kΩ. The input resistance of the current shunt -ve feedback amplifier using the above amplifier with a feedback factor of 0.2 is
A:
1/11 kΩ
B:
1/5 kΩ
C:
5 kW
D:
11 kW
Answer: A

Input Resistance with feedback for current shunt, .

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Recombination produces new electron-hole pairs
A:
True
B:
False
C:
D:
Answer: B

Due to recombination the number of electron-hole pairs is reduced.

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In a bipolar transistor the barrier potential
A:
0
B:
a total of 0.7 V
C:
0.7 V across each depletion layer
D:
0.35 V
Answer: C

Since there are two p-n junctions, there are two depletion layers and 0.7 V across each layer.

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A silicon (PN) junction at a temperature of 20°C has a reverse saturation current of 10 pico Ampere. The reverse saturation current at 40°C for the same bias is approximately.
A:
30 pA
B:
40 pA
C:
50 pA
D:
60 pA
Answer: B

By increasing of temperature by 10°C, Io become double so by increasing temperature 20°C, Io become 4 time than initial value... and it is 40 PA.

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A transistor has two p-n junctions. The batteries should be connected such that
A:
both junctions are forward biased
B:
both junctions are reverse biased
C:
one junction is forward biased and the other is reverse biased
D:
none of the above
Answer: C

Emitter-base junction is forward biased and base collector junction is reverse biased.

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