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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 5
11.
A dc power supply has no load voltage of 30 V and full load voltage of 25 V at full load current of 1 A. The output resistance and voltage regulation respectively are
5 Ω and 25%
25 Ω and 20%
5 Ω and 16.7%
25 Ω and 16.7%
Answer: Option
Explanation:

.

12.
The main advantage of CC amplifier is
High input impedance and low output impedance
Low input impedance and high output impedance
High voltage gain
High current gain
Answer: Option
Explanation:

Therefore, it is suitable for impedance matching.

13.
If a = 0.995, IE = 10 mA, ICO = 0.5 mA, then ICEO will be
100 μA
25 μA
10.1 μA
10.5 μA
Answer: Option
Explanation:

.

14.

Assertion (A): In class C amplifier the efficiency is more than that for other classes of amplifiers

Reason (R): In class C amplifier we can get high efficiency over a wideband

Both A and R are correct and R is correct explanation for A
Both A and R are correct but R is not correct explanation for A
A is correct R is wrong
A is wrong R is correct
Answer: Option
Explanation:

R is not correct because bandwidth of class C amplifier is narrow.

15.
In the following figure C = 0.02 μF, and Vth is known to be of frequency ω = 107 rad/sec and rd = 2.5 Ω and ZTh = RTh = 10 Ω Then phase angle between id and Vd
26.5°
25°
30°
0°
Answer: Option
Explanation:

Zd = (rd)11 (-jxd) 2 - JΩ

θ = tan-1 (-1/2) 26.56 .

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