The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?

Related Mcqs:

1. The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?

   A. 2 W
   B. 6 W
   C. 68 W
   D. None of the above

2. The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?

   A. 5 mV
   B. 2 mV
   C. 8 mV
   D. 5 mV

3. A 6 V battery output is divided down to obtain two output voltages. Three 2.2 kΩ resistors are used to provide the two taps. The two output voltages are___________?

   A. 2 V, 4 V
   B. 2 V, 2 V
   C. 2 V, 6 V
   D. 4 V, 6 V

4. In a certain low-pass filter, fc = 3.5 kHz.if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?

   A. 0 V
   B. 5.97 V
   C. 6 V
   D. 597 mV

5. In a certain low-pass filter, fc = 3.5 kHz. If the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?

   A. 0 V
   B. 5.97 V
   C. 6 V
   D. 597 mV

6. 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

7. A voltage divider consists of two 100 kΩ resistors and a 12 V source. What will the output voltage be if a load resistor of 1 MΩ is connected to the output?

   A. 0.57 V
   B. 6 V
   C. 12 V
   D. 5.7 V

8. 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

9. 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

10. The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?

    A. 10.60 V
    B. 0 V
    C. 21.21 V
    D. 15 V