UNIT IV FEEDBACK AMPLIFIERS AND OSCILLATORS

What is the purpose of a feedback amplifier?

• To decrease the stability of the amplifier

• To increase the distortion of the amplifier

• To control the gain, bandwidth, input and output impedance, and stability of the amplifier

• To reduce the input impedance of the amplifier

How does an oscillator produce a continuous output signal?

• Positive feedback

• Negative feedback

• Digital input

• No feedback

Can you name any common types of feedback amplifiers?

• Voltage-series feedback, current-parallel feedback, voltage-shunt feedback, and current-parallel feedback

• Voltage-parallel feedback, current-parallel feedback, voltage-series feedback, and current-shunt feedback

• Voltage-series feedback, current-series feedback, voltage-shunt feedback, and current-shunt feedback

• Voltage-parallel feedback, current-series feedback, voltage-shunt feedback, and current-shunt feedback

What is the function of a feedback network in an amplifier?

• To increase the distortion of the amplifier

• To increase the input and output impedance of the amplifier

• To control the gain, bandwidth, input and output impedance, and distortion of the amplifier.

• To reduce the gain and bandwidth of the amplifier

What are the key components of an oscillator circuit?

• Amplifier, feedback network, frequency-selective network

• Voltage source, current source, power supply

• Transistor, diode, transformer

• Resistor, inductor, capacitor

Explain the concept of positive feedback in amplifiers.

• Positive feedback decreases the amplification of the input signal.

• Positive feedback has no effect on the amplification of the input signal.

• Positive feedback increases the amplification of the input signal.

• Positive feedback causes the input signal to remain unchanged.

What is the role of an inductor in an oscillator circuit?

• Stores and releases energy

• Regulates the voltage in the circuit

• Creates resistance in the circuit

• Amplifies the input signal

Describe the process of frequency generation in an oscillator.

• No feedback loop

• Passive feedback loop

• Negative feedback loop

• Positive feedback loop