Electrostatics Archives

71. 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

72. . . . . . . . . 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.

73. 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

74. 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

75. One volt is the same as

one joule/coulomb

one coulomb/joule

one coulomb

one joule

Detailed SolutionOne volt is the same as

76. 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 ?

77. 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

78. Dielectric strength of a material depends on

moisture content

temperature

thickness

all of the above

Detailed SolutionDielectric strength of a material depends on

79. 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

80. Which medium has the least dielectric strength ?

Paraffin wax

Quartz

Glass

Air

Detailed SolutionWhich medium has the least dielectric strength ?

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