Electrostatics

21. If

varying voltage produces the charging and dicharging currents
of high peak value
voltage is applied to capacitive circuit, the alternating current can flow in the circuit because A. varying voltage produces the charging and dicharging currents B. of high peak value C. charging current can flow
discharge current can flow

Detailed SolutionIf

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

Electric intensity
Magnetic flux density
Electric flux
None of the above

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

23. Air capacitors are generally available in the range

10 to 400 pF
1 to 20 pF
100 to 900 pF
20 to 100 pF

Detailed SolutionAir capacitors are generally available in the range

24. The absolute permittivity of free space is given by

8.854 x 10-9 F/m
8.854 x 10-10 F/m
8.854 x 10-11 F/m
8.854 x 10-12 F/m

Detailed SolutionThe absolute permittivity of free space is given by

25. One volt is the same as

one joule/coulomb
one coulomb/joule
one coulomb
one joule

Detailed SolutionOne volt is the same as

26. Which of the following capacitor is preferred in case of single phase motor ?

Mica capacitor
Paper capacitor
Electrolytic capacitor
Ceramic capacitor

Detailed SolutionWhich of the following capacitor is preferred in case of single phase motor ?

27. When the dielectric is homogeneous,the potential gradient is

uniform
non-uniform
zero
any of the above

Detailed SolutionWhen the dielectric is homogeneous,the potential gradient is

28. Dielectric strength of a material depends on

moisture content
temperature
thickness
all of the above

Detailed SolutionDielectric strength of a material depends on

29. While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is

Short-circuited
Open circuited
Alright
Leaky

Detailed SolutionWhile testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is

30. Which medium has the least dielectric strength ?

Paraffin wax
Quartz
Glass
Air

Detailed SolutionWhich medium has the least dielectric strength ?

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