Transistor Audio Power Amplifiers

The driver stage usually employs_________________? A. Class A power amplifier B. Push-pull amplifier C. Class C amplifier D. None of the above

The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s. What is the power output ? A. 1 W B. 2 W C. 4 W D. None of the above

The push-pull circuit must use ______________ operation? A. Class A B. Class CC. Class B D. Class AB

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. 2B. 7 C. 3 D. None of the above

For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation? A. 10 WB. 4 W C. 8 W D. None of the above

The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ? A. 10 W B. 15 W C. 5 WD. 20 W

The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ? A. 20 W B. 40 W C. 10 W D. 80 W

Power amplifiers generally use transformer coupling because transformer permits______________? A. Cooling of the circuitB. Impedance matching C. Distortionless output D. Good frequency response…

The most important consideration in power amplifier is __________________? A. Biasing the circuitB. Collector efficiency C. To keep the transformer cool D. None of the above

A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary? A. 5 kO B. 20 kO C. 100 kOD. 10 kO…