In RC coupling, the value of coupling capacitor is about_______________?

Related Mcqs:

1. In an RC coupling scheme, the coupling capacitor CC must be large enough______________?

   A. To pass d.c. between the stages
   B. Not to attenuate the low frequencies
   C. To dissipate high power
   D. None of the above

2. The most costly coupling is _______________ coupling?

   A. RC
   B. Direct
   C. Impedance
   D. Transformer

3. The purpose of a coupling capacitor in a transistor amplifier is to ___________________?

   A. Increase the output impedance of transistor
   B. Protect the transistor
   C. Pass a.c. and block d.c.
   D. Provide biasing

4. The input capacitor in an amplifier is the______________ capacitor?

   A. Coupling
   B. Bypass
   C. Leakage
   D. None of the above

5. The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________?

   A. Avoid voltage gain drop
   B. Forward bias the emitter
   C. Reduce noise in the amplifier
   D. None of the above

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 parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?

   A. 5.14 MHz
   B. 514 kHz
   C. 5.03 MHz
   D. 503 kHz

8. An RC low-pass filter consists of a 120 Ω resistor and a 0.002 µF capacitor. The output is taken across the capacitor. The circuit’s critical frequency is___________?

   A. 333 kHz
   B. 633 kHz
   C. 331 kHz
   D. 60 kHz

9. A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 µF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter?

   A. 459 Hz
   B. 4,591 Hz
   C. 999 Hz
   D. 2,176 Hz

10. A 5 μF capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?

    A. 2.5 x 10-8 C
    B. 10-5 C
    C. 103 C
    D. 4 x 103 C