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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