Push-pull is almost always used with

Class A

Class B

Class C

All of the above

The power rating of a transistor can be increased by

Raising the temperature

Using a heat sink

Using derating curve

Operating with no input signal

The easiest way to bias a JFET in the ohmic region is with

Voltage divider bias

Selfbias

Gate bias

Source bias

The kind of oscillator found in an electronic wrist-watch is the

Armstrong

Clapp

Colpitts

Quartz crystal

With a negative feedback, the returning signal

aids the input signal

opposes the input signal

is proportional to output current

is proportional to differential voltage gain

A Wien bridge is sometimes called a

Notch filter

Twin-T oscillator

Phase shifter

Wheatstone bridge

When there is no base current in a transistor switch, the output voltage from the transistor is
Low

High

Unchanged

Unknown

2. What are Class-C amplifiers? How do they differ from Class-A and Class-B amplifiers

Explain why even harmonics are not present in a push-pull amplifier. Give two additional advantages of this circuit over that of a single transistor amplifier.

Differentiate between the construction and applications of Enhancement type MOSFET and Depletion type MOSFET.

For the self-bias circuit shown below, determine the drain current ID and gate-source voltage in Figure 3

<img src='./qimages/8824-3b.jpg'>

Determine and plot the V0 for the network given below:

<img src='./qimages/8824-4a.jpg'>

With the help of a circuit diagram, briefly describe the operation of a positive clamper circuit. What is the role of resistor in the clamping circuit?

With the help of a circuit diagram, explain the operation of an astable multivibrator. Justify that it is a two-stage R-C coupled amplifier using feedback.

Draw the block diagram of feedback amplifiers in the following configurations

Voltage series feedback

Current series feedback

Distinguish between voltage feedback and current feedback in an amplifier circuit, stating the merits of each.

Explain the working of Colpitts oscillator. Derive an expression for the frequency of oscillation. What are the merits and demerits of this oscillator?

What are the necessary conditions for sustained oscillations Why is loop gain in practical oscillators kept slightly greater than unity?

What is the necessity of tuned amplifiers? Explain in. brief the advantages of using a double-tuned circuit over a single-tuned circuit.

Explain the principles of operation of miller sweep miller bootstrap circuits with circuit diagrams.

8. Write short notes on any four of the following:

Exponential Sweep Circuit

RC Integrator Circuit

Hartley Oscillator

Schmitt Trigger and its Applications

Different types of Negative Feedback and their Applications

UJT Relaxation Oscillator

Voltage Variable Resistor