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Electromagnetic Fields
Quiz 2
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Q.1
Capacitors are mainly used for radio frequency tuning.
Paper
Air
Mica
Electrolytic
Q.2
"The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface". The above statement is associated with
Gauss's law
Kirchhoff s law
Faraday's law
Lenz's law
Q.3
The electrostatic force between two charges of one coulomb each andplaced at distance of 0.5 m will be
36 x 10fa
36 x 107 N
36 x 108 N
36 x 109 N
Q.4
Which of the following capacitors can be used for temperaturecompensation ?
Air capacitor
Ceramic capacitor
Paper capacitor
None of the above
Q.5
The value of dielectric constant for vacuum is taken as
zero
1
4
10
Q.6
Dielectric constant for mica is nearly
200
100
3 to 8
1 to 2
Q.7
Which of the following capacitors will have the least value ofbreakdown voltage ?
Mica
Paper
Ceramic
Electrolytic
Q.8
A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ?
Ceramic capacitor
Mica capacitor
Both will have identical value of capacitance
It depends on applied voltage
Q.9
Which of the following materials has the highest value of dielectricconstant?
Glass
Vacuum
Ceramics
Oil
Q.10
Which of the following capacitors has relatively shorter shelf life ?
Mica capacitor
Electrolytic capacitor
Ceramic capacitor
Paper capacitor
Q.11
In the case of a lossy capacitor, its series equivalent resistance value will be
small
very small
large
zero
Q.12
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.13
A paper capacitor is usually available in the form of
tubes
rolled foil
disc
meshed plates
Q.14
Energy stored in the electric field of a capacitor C when charged froma D.C source of voltage V is equal to joules
CV2
C2V
CV3
CV
Q.15
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will storeenergy of
2 joules
4 joules
6 joules
8 joules
Q.16
The capacitor preferred for high frequency circuits is
air capacitor
mica capacitor
electrolytic capacitor
none of the above
Q.17
The capacity of capacitor bank used in power factor correction isexpressed in terms of
kW
kVA
kVAR
volts
Q.18
While testing a capacitor with ohm-metre, 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
Q.19
Which capacitor will be physically smaller for the same ratings ?
Ceramic capacitor
Paper capacitor
Both will be of equal size
None of the above
Q.20
A capacitor charged toV has(iC of charge. The value ofcapacitance will be
10 F
10 uF
100 nF
1000 uF
0 h : 0 m : 1 s
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