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 ?

Related Mcqs:

1. If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to___________________?

   A. 6 mA
   B. mA
   C. 3 mA
   D. 1 mA

2. The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s. What is the power output ?

   A. 1 W
   B. 2 W
   C. 4 W
   D. None of the above

3. If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least___________________?

   A. 5 W
   B. 33 W
   C. 75 W
   D. 1 W

4. 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

5. Class_____________ power amplifier has the highest collector efficiency ?

   A. C
   B. A
   C. B
   D. AB

6. In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?

   A. 180o
   B. 270o
   C. 90o
   D. 0o

7. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?

   A. 1V
   B. 100V
   C. 20V
   D. 10V

8. A silicon transistor is biased with base resistor method. If ß=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB ?

   A. 105 kO
   B. 530 kO
   C. 315 kO
   D. None of the above

9. 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

10. The value of collector load RC in a transistor amplifier is _______________the output impedance of the transistor?

    A. The same as
    B. Less than
    C. More than
    D. None of the above