Electrical Engineering MCQs

Page No. 34

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


a5 V


b3 V


cZero


d 0.3 V


View Answer 0.3 V

The random motion of holes and free electrons due to thermal agitation is called______________?


aDiffusion


bPressure


cIonisation


dNone of the above


View Answer Diffusion

A hole and electron in close proximity would tend to________________?


aRepel each other


b Attract each other


cHave no effect on each other


dNone of the above


View Answer Attract each other

The battery connections required to forward bias a pn junction are_________________?


a+ve terminal to p and –ve terminal to n


b -ve terminal to p and +ve terminal to n


c -ve terminal to p and –ve terminal to n


dNone of the above



In the depletion region of a pn junction, there is a shortage of_________________?


a Acceptor ions


bHoles and electrons


cDonor ions


dNone of the above


View Answer Holes and electrons

A pn junction acts as a__________________?


aControlled switch


bBidirectional switch


cUnidirectional switch


dNone of the above


View Answer Unidirectional switch

In an intrinsic semiconductor, the number of free electrons_____________?


aEquals the number of holes


bIs greater than the number of holes


c Is less than the number of holes


dNone of the above



When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on_________________?


aJunction capacitance


bMinority carriers


cMajority carriers


d None of the above


View Answer Minority carriers

The leakage current in a pn junction is of the order of________________?


aAa


bmA


ckA


dµA


View Answer µA

The leakage current across a pn junction is due to________________?


aMinority carriers


bMajority carriers


cJunction capacitance


dNone of the above


View Answer Minority carriers

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