If the power level of an amplifier reduces to half, the db gain will fall by___________?

Related Mcqs:

1. An amplifier has a power gain of 100. Its db gain is ________________?

   A. 10 db
   B. 20 db
   C. 40 db
   D. None of the above

2. An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?

   A. 8 db
   B. 6 db
   C. 5 db
   D. 4 db

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

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

4. 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%

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. 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

7. If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is_____________________?

   A. 165
   B. 165 x 104
   C. 100
   D. None of the above

8. The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?

   A. More than
   B. The same as
   C. Less than
   D. Data insufficient

9. The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?

   A. Power loss in the coupling device
   B. Loading effect of the next stage
   C. The use of many transistors
   The use of many capacitors

10. If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?

    A. 600 db
    B. 24 db
    C. 14 db
    D. 27 db