⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs121
At room temperature, an intrinsic silicon crystal acts approximately as_______________?
AA battery
BA conductor
CAn insulator
DA piece of copper wire
122
A forward biased pn junction diode has a resistance of the order of_____________?
AO
BkO
CMO
DNone of the above
123
In a semiconductor, current conduction is due to________________?
AOnly holes
BOnly free electrons
CHoles and free electrons
DNone of the above
124
The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?
A10 atoms for 108 atoms
B1 atom for 108 atoms
C1 atom for 104 atoms
D1 atom for 100 atoms
125
The resistivity of pure germanium under standard conditions is about_______________?
A6 x 104 cm
B60 x cm
C3 x 106 cm
D6 x 10-4 cm
126
The most commonly used semiconductor is________________?
AGermanium
BSilicon
CCarbon
DSulphur
127
A pentavalent impurity has______________Valence electrons?
A3
B5
C4
D6
128
Addition of trivalent impurity to a semiconductor creates many_______________?
AHoles
BFree electrons
CValence electrons
DBound electrons
129
As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor_______________?
ARemains the same
BIncreases
CDecreases
DNone of the above
130
A hole in a semiconductor is defined as_________________?
AA free electron
BThe incomplete part of an electron pair bond
CA free proton
DA free neutron