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.Management Sciences
Category: Transistor Audio Power Amplifiers
Low efficiency of a power amplifier results in_________________?
0
A. Low forward bias
B. Less battery consumption
C. More battery consumption
D. None of the above
What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?
A. 2
B. 7
C. 3
D. None of the above
When a transistor is cut off _________________?
A. Maximum voltage appears across transistor
B. Maximum current flows
C. Maximum voltage appears across load
D. None of the above
The pulsating d.c. applied to power amplifier causes________________?
A. Burning of transistor
B. Hum in the circuit
C. Excessive forward voltage
D. None of the above
________________ coupling is generally employed in power amplifiers?
A. Transformer
B. RC
C. direct
D. Impedance
Class C amplifiers are used as ___________________?
A. AF amplifiers
B. Detectors
A. amplifiers
C. None of the above
An AF amplifier is shielded to ________________?
A. Keep the amplifier cool
B. Protect from rusting
C. Prevent induction due to stray magnetic fields
D. None of the above
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