ECCF Question Bank

Q1. each question is of 2 marks

1.  FET is a voltage controlled device Justify

2.  Draw and explain the transfer characteristics of JFET.

3.  Draw the electrical equivalent  of crystal and explain

4.  Draw the wave forms of  BJT as Class A power amplifier

5.   Draw the AC equivalent of  Self bias unbypassed  Rs  JFET Biasing circuit

6.  Derive the equation for transconductance of JFET

7. What are the different types of Signals.

8. Define Modulation  and explain its need

9. Draw the basic block diagram for communication system

10 Classify the various type of analog modulation and define them

11 Draw the frequency spectrum of DSB-FC.

12. Derive the equation for total power in DSB-FC.

Q2: Each question of five marks

1.  Explain the construction and characteristics of n -channel JFET.

2. Derive the equation for Zi, Zo and Av for Voltage Divider biasing circuit for n-channel JFET( including r_d)

3. Explain BJT as a class A power amplifier with waveforms

4.What is the basic principle for oscillations and draw the circuit diagram of Hartley Oscillator using         JFET.

Q3 . Each question of five marks

1. Derive the equations for Amplitude Modulation with wave forms.

2. Explain How DSB-SC can be generated using JFET Balanced Modulator.

3. Explain Generation of FM by indirect method(Armstrong method)

4. Compare AM, FM and PM

In exam  any five will be selected from Q 1 and two from Q2 and two from Q3.