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

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. In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________?

   A. Thin base
   B. Thin collector
   C. Wide emitter
   D. None of the above

3. 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

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

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

5. In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?

   A. RC + RL
   B. RC || RL
   C. RL
   D. RC

6. A series resonant band-stop filter consists of a 68 Ω resistor, a 110 mH coil, and a 0.02 µF capacitor. The internal resistance, RW, of the coil is 4 Ω. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0?

   A. 1.1 mV
   B. 11.1 mV
   C. 111 mV
   D. 200 mV

7. A series resonant band-pass filter consists of a 2 mH coil, a 0.005 µF capacitor, and a 120 Ω resistor. The winding resistance of the coil is 12 Ω. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?

   A. 10.9 V
   B. 1.09 V
   C. 1.1 V
   D. 12 V

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

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

9. If the input capacitor of a transistor amplifier is short-circuited, then_________________?

   A. Transistor will be destroyed
   B. Biasing conditions will change
   C. Signal will not reach the base
   D. None of the above

10. 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