What is the main purpose of the transformer in a transformer coupled amplifier?
C
To match impedance and transfer signal
D
To block high-frequency signals
Analysis & Theory
The transformer matches impedance and transfers AC signals between amplifier stages efficiently.
Which type of signals are passed through a transformer in a transformer coupled amplifier?
Analysis & Theory
Transformers only pass AC signals; DC is blocked due to the transformer's winding.
Why is impedance matching important in transformer coupled amplifiers?
B
To increase voltage gain
C
To prevent current leakage
D
To transfer maximum power
Analysis & Theory
Impedance matching ensures maximum power transfer between amplifier stages or to the load.
Which frequency range is best suited for transformer coupled amplifiers?
Analysis & Theory
Transformer coupled amplifiers are suitable for high-frequency applications like RF circuits.
What is a major disadvantage of transformer coupled amplifiers?
A
High cost and bulky size
Analysis & Theory
Transformers are large and expensive, making the amplifier bulky and costly.
What type of transformer is typically used in transformer coupled amplifiers?
B
Center-tapped transformer
Analysis & Theory
Audio transformers are commonly used to couple audio signals between amplifier stages.
How does a transformer help in isolating DC between stages?
B
By grounding both stages
C
By using magnetic coupling that only allows AC
Analysis & Theory
Transformers couple stages magnetically, passing AC and isolating DC biasing.
Which amplifier configuration is most commonly used with transformer coupling?
Analysis & Theory
The common emitter configuration is popular due to its high voltage gain.
What happens if the transformer turns ratio is not chosen correctly?
A
The amplifier will oscillate
B
Impedance mismatch and poor power transfer
C
Signal distortion increases
D
Amplifier gain becomes infinite
Analysis & Theory
An incorrect turns ratio causes impedance mismatch, leading to reduced efficiency and poor signal transfer.
Where are transformer coupled amplifiers typically used?
C
High-frequency radio applications
Analysis & Theory
Transformer coupling is ideal for RF and communication circuits where high frequency and impedance matching are crucial.