Power amplifiers handle ______________ signals compare to voltage amplifiers?
(A) Small
(B) Very small
(C) Large
(D) None of the above
The maximum efficiency of transformer coupled class A power amplifier is _______________?
(A) 30%
(B) 50%
(C) 80%
(D) 45%
In class A operation, the operating point is generally located_____________of the d.c. load line?
(A) At cut off point
(B) At the middle
(C) At saturation point
(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
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
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 W
(D) 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 circuit
(B) Impedance matching
(C) Distortionless output
(D) Good frequency response
The most important consideration in power amplifier is __________________?
(A) Biasing the circuit
(B) 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 kO
(D) 10 kO