The output transformer used in a power amplifier is a _____________ transformer?
The output transformer used in a power amplifier is a _____________ transformer? A. 1:1 ratio B. Step-upC. Step-down D. None of the above
The output transformer used in a power amplifier is a _____________ transformer? A. 1:1 ratio B. Step-upC. Step-down D. None of the above
The pulsating d.c. applied to power amplifier causes________________? A. Burning of transistorB. Hum in the circuit C. Excessive forward voltage D. None of the above
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ? A. Amplitude B. IntermodulationC. Frequency D. None of the above
If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________? A. 1V B. 100V C. 20VD. 10V
What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ? A. 20% B. 80%C. 40% D. 50%
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