What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?

Related Mcqs:

1. 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

2. A transistor amplifier has high output impedance because ______________?

   A. Emitter is heavily doped
   B. Collector has reverse bias
   C. Collector is wider than emitter or base
   D. None of the above

3. 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

4. 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

5. The ratio of output impedance of a CE amplifier is _______________?

   A. About 1
   B. Low
   C. High
   D. Moderate

6. Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be______________?

   A. positively charged
   B. electrically neutral
   C. negatively charged
   D. positively and negatively charged

7. If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________?

   A. 20 kΩ
   B. 2 kΩ
   C. 10 kΩ
   D. 5 kΩ

8. It is generally desired that a transistor should have_____________________ input impedance?

   A. Low
   B. Very low
   C. High
   D. Very high

9. In transistor amplifiers, we use_____________transformer for impedance matching?

   A. Step up
   B. Step down
   C. Same turn ratio
   None of the above

10. 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