Class Amplifier Efficiency and Components

This video tutorial covers various types of transistor amplifiers, including Class A, B, AB, and C. It explains the circuit design, efficiency, and applications of each type. The Class A amplifier is known for low distortion but low efficiency, which can be improved with a transformer. The Class B amplifier offers higher efficiency but suffers from crossover distortion, which is mitigated in the Class AB amplifier. The Class C amplifier is highly efficient but has significant distortion, making it suitable for specific applications.

What is the maximum theoretical efficiency of a Class A amplifier?

• 25%

• 50%

• 75%

• 100%

Which component is used to improve the efficiency of a Class A amplifier?

• Transformer

• Resistor

• Capacitor

• Diode

How many degrees of the input cycle does a Class A amplifier conduct?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

What is the main issue with the output of a Class B amplifier?

• High distortion

• Crossover distortion

• Low gain

• High power consumption

What is the maximum theoretical efficiency of a Class B amplifier?

• 99%

• 78.5%

• 50%

• 25%

How does a Class AB amplifier reduce crossover distortion?

• Using two diodes

• Using a resistor

• Using a transformer

• Using a capacitor

What is the main advantage of a Class AB amplifier over a Class B amplifier?

• Reduced crossover distortion

• Lower cost

• Simpler design

• Higher efficiency

What is the maximum theoretical efficiency of a Class C amplifier?

• 78.5%

• 25%

• 50%

• 99%

What is a major disadvantage of the Class C amplifier?

• High cost

• Low efficiency

• High distortion

• Complex design

Which component combination is used in a Class C amplifier for tuning?

• Resistor and inductor

• Transformer and diode

• Inductor and capacitor

• Resistor and capacitor