Exercise: Analog Electronics

Questions for: Analog Electronics

A voltage gain of a CE amplifier connected in collector to base configuration is 50. Collector to base resistor RF = 1 kΩ, RC = 4Ω, the O/P resistance R0 =?
A:
800 Ω
B:
813 Ω
C:
817 Ω
D:
819 Ω
Answer: B

R0 = RC || RF' and , where RF is Miller resistance.

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In figure the cut in voltage of diode is 0.7 V and its bulk resistance is 20 Ω. The peak value of circuit current of during positive and negative half cycles are
A:
10 mA and zero
B:
9.12 mA and zero
C:
9.3 mA and zero
D:
zero and 9.12 mA
Answer: B

During positive half cycle current I = or I 9.12 mA. During negative half cycle diode is reverse biased and current is zero.

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If an amplifier with gain of - 100 and feedback of β = - 0.1 has a gain change of 20% due to temperature the change in gain of the feedback amplifier will be
A:
0.02%
B:
2%
C:
0.1%
D:
0.01%
Answer: B

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A BJT is said to be operating in saturation region if
A:
both junctions are reverse biased
B:
both junctions are forward biased
C:
base emitter junction is forward biased and base collector junction is reverse biased
D:
base collector junction is forward biased and base emitter junction is reverse biased
Answer: B

For saturation both junctions have to be forward biased.

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Which configuration is suitable for impedance matching?
A:
CB
B:
CE
C:
CC
D:
CB and CE
Answer: C

CC has high input impedance and low output impedance. Hence suitable for impedance matching.

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