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ECE Objective Questions { Operational Amplifier and Its Applications }



64. The class B push-pull circuit candeliver 100W 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

65.  What turn ratio (N /N) of transformer is required to mate% 4 LI speaker to a transistor having an output impedance of 80001?
A.35.2
B.44.7
C.54.3
D. none of the above

66. A transformer coupled class A power amplifier has a load of 100 L2 on the secondary. If the turn ratio is 10: 1, what is the value of load appearing on the primary?
A.5kI
B. 20 ka
C. 1001d2
D. 10 ki2

67.  Power amplifiers generally use transformer coupling because transformer permits
A. cooling of the circuit
B. impedance matching
C. distortionless output
D. good frequency response

68. Transformer coupling can be used in amplifiers.
A. either power or voltage
B. only power
C. only voltage
D. none of the above

69. The output transformer used in a power amplifier is a _____ transformer.
A. 1: I ratio
B. step-up
C. step-down
D. none of the above

70. The most important consideration in power amplifiers is ____ biasing the circuit
A. collector efficiency
B. to keep the transformer cool
C. none of the above
D.

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