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%...