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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 3
21.
In a CE amplifier
both ac and dc load lines have the same slope
the ac load line has more slope than dc load line
the ac load line has less slope than dc load line
the two load lines may have slope more than the other
Answer: Option
Explanation:

Since ac collector resistance is less than dc collector resistance, slope of ac load line is more than that of dc load line.

22.
The voltage gain of an amplifier without and with feedback are 100 and 20. The negative feedback is
4%
5%
20%
80%
Answer: Option
Explanation:

or β = 0.04 or 4% .

23.
In the circuit shown in figure, RC = 10k, RE = 150Ω, β = 100, I = 1 mA. The value of , will be
50
100
192
400
Answer: Option
Explanation:

circuit shown is Darlington Amplifier.

Gain

.

24.
Calculate the conductivity of pure silicon at room temperature when the concentration of carriers is 1.6 x 1010 per cm3. Take μe = 1500 cm2/V-sec, μh = 500 cm2/V-sec at room temperature,
5.12 x 10-16
5 x 10+16
1016
5 x 1020
Answer: Option
Explanation:

σi = (μe + μn) . e . ni .

25.
A potential of 7 V is applied to a silicon diode. A resistance of 1 kΩ is also connected in series. If the diode is forward biased, the current in the circuit is
7 mA
6.3 mA
0.7 mA
0
Answer: Option
Explanation:

A = 6.3 mA.

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