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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 5
21.
To bypass a 100 ohm emitter resistor at
10 μF
100 μF
1000 μF
1 μF
Answer: Option
Explanation:

XC < 0.1 x 100 or XC < 10 Ω or 10 = or C 1000 mF.

22.
In a CE amplifier the dc load line is the same as ac load line when
ac collector resistance and dc collector resistance are equal
ac collector resistance and dc emitter resistance are equal
ac collector resistance is very high
ac collector resistance is one half of dc collector resistance
Answer: Option
Explanation:

When ac collector resistance is very high, the net resistance is the same as dc collector resistance.

23.
If the output current wave shape of class C circuit has a period of 1 μs and a pulse width of 0.006 μs, the duty cycle is
6%
0.6%
0.006%
0.06%
Answer: Option
Explanation:

.

24.
Which configuration is suitable for impedance matching?
CB
CE
CC
CB and CE
Answer: Option
Explanation:

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

25.
A BJT is said to be operating in saturation region if
both junctions are reverse biased
both junctions are forward biased
base emitter junction is forward biased and base collector junction is reverse biased
base collector junction is forward biased and base emitter junction is reverse biased
Answer: Option
Explanation:

For saturation both junctions have to be forward biased.

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