A. Small output
B. Eddy currents and magnetic hysterias
C. Soft iron core
D. Back emf
Related Mcqs:
- 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 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 - The maximum efficiency of transformer coupled class A power amplifier is _______________?
A. 30%
B. 50%
C. 80%
D. 45% - 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 - 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 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 output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?
A. Transistor
B. Biasing circuit
C. Collector supply VCC
D. None of the above - The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?
A. 3-Jan
B. 3
C. 1
D. 6 - Transformer works on the principle of________________?
A. Lenzs law
B. Faradays law
C. Mutual induction
D. Law of conservation of power - For long distance transmission the transformer used is_____________?
A. Step down
B. Input voltage and output voltage remain same
C. Step up
D. Amplifier is used
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