Power loss in actual transformer is due to_________________?

Related Mcqs:

1. Power amplifiers generally use transformer coupling because transformer permits______________?

   A. Cooling of the circuit
   B. Impedance matching
   C. Distortionless output
   D. Good frequency response

2. 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

3. The maximum efficiency of transformer coupled class A power amplifier is _______________?

   A. 30%
   B. 50%
   C. 80%
   D. 45%

4. 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

5. 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%

6. 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

7. 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

8. 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

9. Transformer works on the principle of________________?

   A. Lenzs law
   B. Faradays law
   C. Mutual induction
   D. Law of conservation of power

10. 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