Electrical Engineering MCQs

Page No. 192

The minimum value of potential gradient in a cable occurs in____________?


ainsulation


bconductor


couter sheath


duniformly all over


View Answer insulation

Dielectric strength of medium____________?


aincreases with rise in temperature


b increases with moisture content


cis same for all insulating materials


dnone of the above


View Answer none of the above

A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is___________?


a100 kV/m


b10 kV/m


c5 kV/m


d2 kV/m


View Answer 100 kV/m

What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it__________ ?


aIt will become magnetic


b It will melt


cIt will get punctured or cracked


dIts molecular structure will get changed



A capacitor consists of two____________?


aceramic plates and one mica disc


binsulators separated by a dielectric


csilver-coated insulators


dconductors separated by an insulator



The time constant and R-C circuit may also be defined as the time during which the charging current falls to ________ percent of its initial maximum value


a 37


b 42


c63


d73


View Answer 37

at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point ?


aElectric intensity


bMagnetic flux density


cElectric flux


dNone of the above


View Answer Electric intensity

A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________?


a62 x 105 V/m


b72 x 105 V/m


c82 x 105 V/m


d92 x 105 V/m


View Answer 72 x 105 V/m

capacitors are used for audio frequency and radio frequency coupling and tuning ?


aAir


bMica


cPlastic film


dCeramic


View Answer Mica

The units of volume charge density are___________?


aCoulomb/meter


bCoulomb/meter


cCoulomb/meter


dCoulomb/meter


View Answer Coulomb/meter

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