Which of the following characteristics are possessed by a transformer coupled class B push pull power amplifier?1. It eliminates even harmonic distortion2. It suffers from cross over distortion3. Its device ratings are higher than those of class A power amplifier4. Its collector circuit efficiency is more than that of class C power amplifierSelect the correct answer using the code given below:a)1, 3 and 4b)2 and 4c)1 and 2d)3 and 4 onlyCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Transformer Coupled Class B Push Pull Power Amplifier Characteristics:

1. Eliminates even harmonic distortion:
- Transformer coupled class B push-pull power amplifiers are designed to eliminate even harmonic distortion by utilizing the push-pull configuration, which cancels out even harmonics.

2. Suffers from cross over distortion:
- Despite efforts to minimize distortion, class B push-pull amplifiers still suffer from crossover distortion, which occurs when one transistor turns off and the other turns on, causing a gap in the output waveform.

3. Device ratings are higher than those of class A power amplifier:
- In a transformer-coupled class B push-pull amplifier, the devices (transistors) are required to handle higher power levels compared to class A amplifiers due to the efficiency of the push-pull configuration.

4. Collector circuit efficiency is more than that of class C power amplifier:
- Class B push-pull amplifiers have higher collector circuit efficiency compared to class C amplifiers, as they operate closer to the ideal 78.5% efficiency of class B amplifiers.
Therefore, the correct characteristics possessed by a transformer-coupled class B push-pull power amplifier are the elimination of even harmonic distortion and suffering from crossover distortion.

Answer

Transformer coupled class B push pull amplifiers:

1. It suffers from cross over distortions

2. It eliminates even harmonic distortion

3. Its device ratings lower than class A power amplifiers

4. Theoretical efficiency is 78%

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