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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 1
36.
A CB amplifier has re = 6 Ω, RL = 600 Ω and a = 0.98. The voltage gain is
100
600 x 0.98
98
6
Answer: Option
Explanation:

37.
A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is RL and filter capacitance is C. For good output wave shape, the time constant RLC should be at least equal to
10 ms
20 ms
50 ms
100 ms
Answer: Option
Explanation:

Time constant RLC must be about 5 x 20 ms.

38.
Si transistor of following figure has a = 0.9 and ICE= 0, VEE = 5 V and VCC = 13 V, then RE will be if IEQ = 1 mA
3 kΩ
4 kΩ
5 kΩ
4.3 kΩ
Answer: Option
Explanation:

39.
In class C operation of an amplifier circuit, the collector current exists for
360° of input wave
180° of input wave
more than 180° of input wave
less than 180° of input wave
Answer: Option
Explanation:

In class C operation output is in the form of short duration pulses.

40.
The 'h' parameters of the circuit shown in the figure are hib = 25 Ω, hfb = 0.999 and hob = 10-6Ω The Voltage gain is
0.99
1.98
2.0
4
Answer: Option
Explanation:

Zi = 25 + 10-6 x 0.99 x 104 25

.

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