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Worksheet-2 (Semiconductor Devices)


                1   If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the
                    ripple will be
                     (a) 50 Hz
                    (b) 70.7 Hz
                    (c) 100 Hz
                     (d) 25 Hz
                2   What type of doping is used in Zener diode
                    a) light
                     b) moderate
                     c) heavy
                    d) no doping
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                    True/False Type Questions             (Q-4&5)
                4   Capacitor is used as a filter in a rectifier.
                5   Ideal junction diode acts as a closed switch when forward biased and open switch when reverse
                    biased.
                6   In p-n junction diode there is a _______________ of majority carriers across the junction in
                    forward bias.
                7   In half-wave rectification, if the input frequency is 50 Hz then the output frequency of the signal
                    will be ________________ Hz.
                8   LED works under reverse _______________condition.
                9   Why is photodiode works in reverse bias? Explain.
                10  State the factor, which controls :
                    (i) wavelength of light, and
                    (ii) intensity of light emitted by an LED.
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