UNIT II AMPLIFIERS Quiz

What is an amplifier?

• A device that converts sound into electricity.

• A device that decreases the amplitude of a signal.

• A device that filters out unwanted frequencies.

• A device that increases the amplitude of a signal.

What is the purpose of an amplifier?

• To convert digital signals to analog

• To increase the amplitude of a signal

• To decrease the amplitude of a signal

• To reduce the frequency of a signal

Name one type of amplifier.

• Microphone amplifier

• Operational amplifier (op-amp)

• Guitar amplifier

• Speaker amplifier

What is the function of a transistor in an amplifier?

• Amplify the input signal

• Block the input signal

• Create interference in the input signal

• Reduce the input signal

How does an amplifier increase the amplitude of a signal?

• By reducing the frequency of the signal to increase its amplitude.

• By converting the signal from analog to digital format.

• By using active components such as transistors to boost the strength of the signal.

• By using passive components such as resistors to boost the strength of the signal.

What is the difference between a voltage amplifier and a current amplifier?

• Reduces power

• Amplifies voltage or current

• Changes frequency

• Amplifies sound

Explain the concept of gain in an amplifier.

• The gain in an amplifier is the resistance of the input signal

• The gain in an amplifier is the frequency of the output signal

• The gain in an amplifier refers to the ratio of the output voltage, current, or power to the input.

• The gain in an amplifier is the color of the amplifier casing

Why is it important to use amplifiers in electronic devices?

• To make the device heavier

• To decrease the strength of a signal

• To reduce the efficiency of the device

• To increase the strength of a signal