Transformer works on the principle of________________?

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. Power loss in actual transformer is due to_________________?

   A. Small output
   B. Eddy currents and magnetic hysterias
   C. Soft iron core
   D. Back emf

4. 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

5. 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

6. Which of the following works on torque on the current carrying conductor placed in magnetic field ?

   A. galvanometer
   B. ammeter
   C. voltmeter
   D. all of the above

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

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

8. Transformer coupling can be used in______________amplifiers?

   A. Either power or voltage
   B. Only power
   C. Only voltage
   D. None of the above

9. 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

10. Transformer coupling provides high efficiency because___________?

    A. Collector voltage is stepped up
    B. resistance is low
    C. collector voltage is stepped down
    D. none of the above