The barrier voltage at a pn junction for germanium is about________________?

Related Mcqs:

1. 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

2. 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

3. The resistivity of pure germanium under standard conditions is about_______________?

   A. 6 x 104 cm
   B. 60 x cm
   C. 3 x 106 cm
   D. 6 x 10-4 cm

4. The leakage current in a silicon transistor is about_____________ the leakage current in a germanium transistor?

   A. One hundredth
   B. One tenth
   C. One thousandth
   D. One millionth

5. For germanium transistor amplifier, VCE should_______________for faithful amplification?

   A. Be zero
   B. Be 0.2 V
   C. Not fall below 0.7 V
   D. None of the above

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. A certain voltage divider consists of three 1 kΩ resistors in series. Which of the following load resistors will have the least effect on the output voltage?

   A. 1 MΩ
   B. 100 kΩ
   C. 1 kΩ
   D. 330 Ω

8. A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is____________?

   A. 18 V peak-to-peak
   B. zero
   C. 9 V peak-to-peak
   D. 12.74 V peak-to-peak

9. 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

10. The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?

    A. 3-Jan
    B. 3
    C. 1
    D. 6