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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 5
26.
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
0.02%
2%
0.1%
0.01%
Answer: Option
Explanation:

.

27.
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
10 mA and zero
9.12 mA and zero
9.3 mA and zero
zero and 9.12 mA
Answer: Option
Explanation:

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

28.
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 =?
800 Ω
813 Ω
817 Ω
819 Ω
Answer: Option
Explanation:

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

.

29.
A voltage multiplier circuit, using diodes and capacitors is suitable for
high voltage high current device
high voltage low current device
low voltage low current device
low voltage high current device
Answer: Option
Explanation:

It is a high voltage device. However current has to be low since diode rated currents are low.

30.
In a CE amplifier the ac emitter resistance
is zero
is high
is very high
may have any value
Answer: Option
Explanation:

Emitter is at ground potential for ac signals.

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