Practice free Semiconductor Electronics: Materials, Devices and Simple Circuits (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Zener breakdown in a semi-conductor diode occurs when
(b) When reverse bias is increased, the electric field at the junction also increases. At some stage the electric field breaks the covalent bond, thus the large number of charge carriers are generated. This is called Zener breakdown.
When forward bias is applied to a P-N junction, then what happens to the potential barrier , and the width of charge depleted region x
(d) In forward biasing both and x decreases.
Function of rectifier is
The primary function of a rectifier is to convert alternating current (AC) into direct current (DC). This is achieved by allowing the flow of current in one direction while blocking it in the opposite direction, effectively removing the negative half-cycles of the AC waveform.
When the P end of P-N junction is connected to the negative terminal of the battery and the N end to the positive terminal of the battery, then the P-N junction behaves like
(b) In this condition junction is reverse biased.
A potential barrier of 0.50 V exists across a P-N junction. If the depletion region is m wide, the intensity of the electric field in this region is
(a)
If no external voltage is applied across P-N junction, there would be
(b) Across the junction, a barrier potential is developed whose direction is from region to region.
Barrier potential of a P-N junction diode does not depend on
(d) Barrier potential does not depend upon diode design but it depends upon temperature, doping density, and forward biasing.
Zener breakdown takes place if
(b) Zener breakdown can occur in heavily doped diodes. In lightly doped diodes the necessary voltage is higher, and avalanche multiplication is then the chief process involved.
Which one of the following statements is not correct
(c) Diode acts as open switch only when it is reverse biased
Which is the wrong statement in following sentences?
A device in which P and N-type semiconductors are used is more useful then a vacuum type because
(d) P and N type semiconductors are stable. That's why these semiconductors have low efficiency.
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