Electrical Engineering MCQs

Page No. 101

The minority carrier concentration is largely a function of_____________?


a forward biasing voltage


breverse biasing voltage


ctemperature


dthe amount of doping


View Answer temperature

The current due to electron flow in conduction band is the hole current in valence band?


aequal to


bless than


c greater than


d any of the above


View Answer greater than

For germanium the forbidden energy gap is_______________?


a0.15 eV


b0.25 eV


c0.5eV


d0.7eV


View Answer 0.7eV

is an element used in semiconductors whose atoms have three valence electrons?


a An acceptor


b A donor


cGermanium


dSilicon


View Answer An acceptor

The carbon percentage is least in__________________?


alow carbon steel


bwrought iron


ccast iron


dmalleable iron


View Answer wrought iron

The conductivity of an extrinsic semiconductor with temperature________________?


adecreases


b increases


cremains constant


dNone of them


View Answer remains constant

For a hole which of the following statements is incorrect ?


aHoles can exist in certain semiconductors only


b Holes can exist in any material including conductors


c Holes may constitute an electric current


dHoles can be considered as a net positive charge



For a particular material the Hall coefficient was found to be zero. The material is______________?


ainsulator


bmetal


cintrinsic semiconductor


dnone of the above


View Answer metal

Superconducting metal in super conducting state has relative permeability of________________? 0


azero


bone


cnegative


dmore than one


View Answer zero

Which of the following factors affect resistivity of metals ?


a Age hardening


b Alloying


cTemperature


dAll of the above


View Answer All of the above

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