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Semiconductor D...

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  • Question 1
    4 / -1

    In PN-junction diode the reverse saturation current is 10–5 amp at 27° C. The forward current for a voltage of 0.2 volt is [exp (7.62) = 2038.6, k = 1.4 × 10–23J /K]

  • Question 2
    4 / -1

    A 2 V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is

  • Question 3
    4 / -1

    A P-type semiconductor has acceptor levels 57 meV above the valence band. The maximum wavelength of light required to create a hole is (Planck\'s constant h = 6.6 × 10–34J - s)

  • Question 4
    4 / -1

    The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistor R, connected in series with the diode for obtaining maximum current?

  • Question 5
    4 / -1

    For a transistor amplifier in common emitter configuration for load impedance of 1 kΩ (hfe = 50 and hoe = 25µA /V) the current gain is

  • Question 6
    4 / -1

    In semiconductor the concentrations of electrons and holes are 8 × 1018 /m3 and 5 × 1018 /m respectively. If the mobilities of electrons and holes are 2.3m2 /volt - s and 0.01 m2 /volt - s respectively, then semiconductor is

  • Question 7
    4 / -1

    A sinusoidal voltage of peak value 200 volt is connected to a diode and resistor R in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to R the rms voltage (in volt) across R is approximately

  • Question 8
    4 / -1

    The junction diode in the following circuit requires a minimum current of 1 mA to be above the knee point (0.7 V) of its I-V characteristic curve. The voltage across the diode is independent of current above the knee point. If VB = 5V, then the maximum value of R so that the voltage is above the knee point, will be

  • Question 9
    4 / -1

    In the circuit given below, V(t) is the sinusoidal voltage source, voltage drop VAB (t) across the resistance R is

  • Question 10
    4 / -1

    A transistor is used as an amplifier in CB mode with a load resistance of 5 kΩ the current gain of amplifier is 0.98 and the input resistance is 70Ω, the voltage gain and power gain respectively are

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