Electrical Engineering MCQs

Page No. 102

Surface resistance of an insulating material is reduced due to the______________?


asmoky and dirty atmosphere


bhumidity in the atmosphere


cboth (A) and (b)


dneither (A) nor (b)


View Answer both (A) and (b)

In conductors conduction of electricity takes place due to movement of_______________?


aelectrons only


b positive ions only


cnegative ions only


dpositive and negative ions


View Answer electrons only

Effect of moisture on the insulating materials is to________________?


adecrease dielectric constant


bdecrease dielectric strength


cdecrease insulation resistance


dall of the above


View Answer all of the above

The forbidden gap in an insulator is________________?


alarge


bsmall


cnil


dany of the above


View Answer large

If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as____________?


anon-linear conductor


breverse conductor


cbad-conductor


dnon-conductor


View Answer non-linear conductor

Due to which of the following fact, in India, aluminium is replacing copper ?


aAluminium is more ductile and malleable than copper


bAluminium is available in plenty, cheaper and lighter than copper


cAluminium has lower resistivity than that of copper


dAluminium has less temperature co-efficient than copper



Selenium is __________ semiconductor?


aextrnisic


b intmisic


c N-type


dP-type


View Answer intmisic

The photo-electric effect occurs only when the incident light has more than a certain critical____________?


aintensity


b speed


cfrequency


dwave length


View Answer frequency

Spark plug makes use of which of the following materials for insulation ?


a Porcelain


bSlate


cAsbestos


dGlass


View Answer Porcelain

___________ has the best damping properties?


aDiamond


bHigh speed steel


cMild steel


dCast iron


View Answer Cast iron

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