Electrical Engineering MCQs

Page No. 334

If/, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to_______________?


aI2Rt


bI2Rf


cI2R2t


dI2R2t*


View Answer I2Rt

A thermistor has_____________?


apositive temperature coefficient


bnegative temperature coefficient


czero temperature coefficient


d variable temperature coefficient



With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?


a10 W


b20 W


c40 W


d 60 W


View Answer 60 W

The number of electrons in the outer most orbit of carbon atom is___________?


a 3


b 4


c6


d7


View Answer 4

The ratio of mass of proton to that of electron is nearly_____________?


a1840


b1840


c30


d4


View Answer 1840

Voltage dependent resistors are used_____________?


afor inductive circuits


b to supress surges


cas heating elements


d as current stabilizers


View Answer to supress surges

Voltage dependent resistors are usually made from________________?


aCharcoal


bSilicon Carbide


cNichrome


dGraphite


View Answer Silicon Carbide

All good conductors have high____________?


aconductance


b resistance


creluctance


dthermal conductivity


View Answer conductance

are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________?


aVaristors


bThermistor


cSemi-conductors


dVariable resistors


View Answer Semi-conductors

An open resistor, when checked with an ohm-meter reads_____________?


azero


binfinite


chigh but within tolerance


d low but not zero


View Answer infinite

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