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?

Related Mcqs:

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

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

2. If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?

   A. Vs/Vp = Np/Ns
   B. Vs/Vp = Ns/Np
   C. Vp/Vs = Ns/Np
   D. Vp/Vs = Np/Ns

3. 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

4. A 2-transistor class B power amplifier is commonly called ______________ amplifier?

   A. Dual
   B. Push-pull
   C. Symmetrical
   D. Differential

5. 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

6. 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

7. In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?

   A. Changes abruptly with frequency
   B. Is constant
   C. Changes uniformly with frequency
   D. None of the above

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

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

9. 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

10. 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%