The output transformer used in a power amplifier is a _____________ transformer?
A. 1:1 ratio
B. Step-up
C. Step-down
D. None of the above
Transistor Audio Power Amplifiers
The pulsating d.c. applied to power amplifier causes________________?
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
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
A. Amplitude
B. Intermodulation
C. 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________________?
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. 20V
D. 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 ?
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_________________?
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 ?
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?
The push-pull circuit must use ______________ operation?
A. Class A
B. Class C
C. 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 ?
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
For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
A. 10 W
B. 4 W
C. 8 W
D. None of the above