1.a. Explain the concept and significance of CMRR and slew Rate in case of op-amps.

1.b. Given $\small \beta$ = 120 and $I_{E}$ = 3.2 mA for a common-emitter configuration with $r_{0}$ = $\small \ \infty$ $\small \Omega$, determine.

i) $Z_{i}$

ii) $A_{v}$ if a load of 2 k$\small \Omega$ is applied.

iii) $A_{i}$ with the 2 k$\small \Omega$ load.

1.c. Discuss the factors that influence modulation index of an FM wave.

1.d. Justify that adaptive delta modulation superior to delta modulation.

2.a. The emmiter bias configuration as shown in following figure has the specifications:

$.I_{CQ}$ = $\frac{1}{2} I_{Csat}$ $ .I_{Csat}$ = 8 mA

$V_{C}$ = 18 V and $\small \beta$ = 110

Determine $R_{C}$, $R_{E}$ and $R_{a}$

2.b. Explain how op-amp can be used comparator and zero crossing detector.

3.a. What is the source of the leakage current in a transistor?

If the emitter current of a transistor is 8 mA and $I_{B}$ is 1/100 of $I_{C}$ , determine the levels of $I_{C}$ and $I_{B}$.

3.b. Draw and explain Colpitts oscillator.

3.c. Explain principle of FDM.

3.d. Determine the output voltage for the circuit if $V_{1}$ = 5V, and $V_{2}$ = 3V

4.a. What is DSBSC wave and explain its generation using balanced modulator.

4.b. What is multiplexing in communication system? Draw block diagram of TDM-PCM system and explain.

5.a. State shannon's theorem on channel capacity.

What is the maximum capacity of a perfectly noiseless channel whose bandwidth is 120 Hz, which the values of the data transmitted may be indicated by any one of the 10 different amplitude?

5.b. With respect to neat diagram explain the elements of analog communication system,.

6.a. What is meant by Nyquist rate in sampling and explain its significance.

6.b. Give the proper definition for entropy and information rate.

6.c. Write short note on op-amp as differentiator.

6.d. Differentiate between Class A and Class C power amplifiers with respect to cicuit diagram, operating cycle and power effificency.