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Q.1
The bridge used for the measurement of the value of the capacitance is
Wien’s bridge
Wheatstone bridge
Schering bridge
Hay’s bridge
Q.2
is that property of a capacitor which delays any change of voltage across it.
Inductance
Capacitance
Potential gradient
None of the above
Q.3
Which of the following capacitors preferred for high frequency circuits ?
Air capacitor
Electrolytic capacitor
Mica capacitor
none of the above
Q.4
The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as
Photoelectric effect
Chemical effect
Magnetic effect
Induction
Q.5
The lines of force due to charged particles are
always straight
always curved
sometimes curved
none of the above
Q.6
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
Q.7
A capacitance is a circuit component that opposes the change in circuit
current
voltage
impedance
none of the above
Q.8
In order to remove static electricity from machinery
construct insulated cabins
insulate the machinery
ground the framework
humidify the surroundings
Q.9
Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ?
50
100
150
200
Q.10
Which of the following material has least value of dielectric constant ?
Ceramics
Oil
Glass
Paper
Q.11
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
Q.12
The relative permittivity of free space is given by
1
10
100
1000
Q.13
To prevent the generation of static charges on rubber or flat leather
surface is moistened
conductive dressing is done
oil compound dressing is done
talcum powder is sprayed on the surface
Q.14
A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be
5 times smaller than before
5 times greater than before
10 times greater than before
25 times larger than before
Q.15
One volt is the same as
one joule/coulomb
one coulomb/joule
one coulomb
one joule
Q.16
_______ field is associated with the capacitor.
Electric
Magnetic
Both (A) and (B)
None of the above
Q.17
If three 15 uF capacitors are connected in series, the net capacitance is
5 uF
30 uF
45 uF
50 uF
Q.18
Which of the following materials has the highest value of dielectric constant?
Glass
Vacuum
Ceramics
Oil
Q.19
at a point is equal to the negative potential gradient at that point.
Electric intensity
Electric flux
Magnetic flux
Magnetic flux density
Q.20
The electric field at a point situated at a distance d from straight charged conductor is
proportional to d
inversely proportional to d
inversely proportional to d
none of the above
Q.21
capacitors are used for audio frequency and radio frequency coupling and tuning.
Air
Mica
Plastic film
Ceramic
Q.22
Electric field intensity is a quantity
scalar
vector
both (A) and (B)
none of the above
Q.23
The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its value.
37, initial
62, initial
62, final
37, final
Q.24
The potential gradient across the material of low permittivity is than across the material of high permittivity.
smaller
greater
both (A) and (B)
none of the above
Q.25
A condenser suitable for D.C. only is
Metallic plate variable gang condenser
Metallic paper capacitor
Oil impregnated paper condenser
Poled aluminium electrolytic condenser
Q.26
The dissipation factor of a good dielectric is of the order of
0.0002
0.002
0.02
0.2
Q.27
A charge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10
3
N, is known as
milli-coulomb
micro-coulomb
pico-coulomb
coulomb
Q.28
A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is
0.024 F
0.12 F
0.6 F
0.8 F
Q.29
If three 10 uF capacitors are connected in parallel, the net cararitance is
20 uF
30 uE
40 uF
50 uF
Q.30
capacitors can be used only for D.C.
Air
Paper
Mica
Electrolytic
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