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Quiz 3
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Q.1
Dielectric strength of a material depends on
moisture content
temperature
thickness
all of the above
Q.2
A region around a stationary electric charge has
An electric field
A magnetic field
Both (A) and (B)
None of the above
Q.3
A gang condenser is a
polarised capacitor
variable capacitor
ceramic capacitor
none of the above
Q.4
When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will
remain uncharged
decrease
increase
become zero
Q.5
Which of the following capacitors will have the least value of breakdown voltage ?
Mica
Paper
Ceramic
Electrolytic
Q.6
Which of the following capacitors can be used for temperature compensation ?
Air capacitor
Ceramic capacitor
Paper capacitor
None of the above
Q.7
For closer tolerances which of the following capacitors is usually preferred ?
Paper capacitor
Mica capacitor
Ceramic disc capacitor
None of the above
Q.8
Dielectric strength of mica is
10 to 20 kV/mm
30 to 50 kV/mm
50 to 200 kV/mm
300 to 500 kV/mm
Q.9
Paper capacitors usually have a tolerance of
± 5%
± 10%
± 15%
± 20%
Q.10
A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be
10 F
10 uF
100 nF
1000 uF
Q.11
Permittivity is expressed in
Farad/sq-m
Farad/meter
Weber/meter
Weber/sq-m
Q.12
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
2 joules
4 joules
6 joules
8 joules
Q.13
Which of the following capacitors will have the least variation?
Paper capacitor
Ceramic capacitor
Silver plated mica capacitor
None of the above
Q.14
The capacity of capacitor bank used in power factor correction is expressed in terms of
kW
kVA
kVAR
volts
Q.15
capacitors are used in transistor circuits.
Ceramic
Paper
Air
Electrolytic
Q.16
The number of Faraday tubes of flux passing through a surface in an electric field is called
electric flux
electric flux density
magnetic flux density
electric charge density
Q.17
The value of E within the field due to a point charge can be found with the help of
Faraday’s laws
Kirchhoff's laws
Coulomb’s laws
none of the above
Q.18
In a cable capacitor, voltage gradient is maximum at the surface of the
earth
conduction
sheath
insulator
Q.19
Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them
all in series
all in parallel
two in parallel and third in series with this combination
two in series and third in parallel across this combination
Q.20
The unit of dielectric strength is given by
V/m
V2/m
m/V
m/V2
Q.21
Dielectric constant for mica is nearly
200
100
3 to 8
1 to 2
Q.22
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
62 x 105 V/m
72 x 105 V/m
82 x 105 V/m
92 x 105 V/m
Q.23
An uncharged conductor is placed near a charged conductor, then
the uncharged conductor gets charged by conduction
the uncharged conductor gets charged by induction and then attracted towards the charging body
the uncharged conductor is attracted first and then charged by induction
it remains as such
Q.24
When the dielectric is homogeneous,the potential gradient is
uniform
non-uniform
zero
any of the above
Q.25
A field line and an equipotential surface are
always parallel
always at 90°
inclined at any angle 0
none of the above
Q.26
Dielectric strength of a medium is usually expressed in
J/mm
C/m²
kV/mm
N/mm
Q.27
The units of capacitance are
volts/coulomb
coulombs/volt
ohms
henry/Wb
Q.28
This mention statement is associated with "The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface".
Gauss's law
Kirchhoff's law
Faraday's law
Lenz's law
Q.29
Capacitance increases with
increase in plate area and decrease in distance between the plates
increase in plate area and distance between the plates
decrease in plate area and value of applied voltage
reduction in plate area and distance between the plates
Q.30
If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will
decrease
increase
remains unchanged
become zero
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