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Quiz 2
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Q.1
The sparking between two electrical contacts can be reduced by inserting a
capacitor in parallel with contacts
capacitor in series with each contact
resistance in line
none of the above
Q.2
The units of volume charge density are
Coulomb/meter
Coulomb/meter
Coulomb/meter
Coulomb/meter
Q.3
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
Q.4
When a dielectric is placed in an electric field the field strength
decreases
increases
reduces to zero
remain unchanged
Q.5
Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is
0.56 x 1015 m/s2
1.5 x 1015 m/s2
1.6 x 1015 m/s2
1.76 x 1015 m/s2
Q.6
Dielectric strength of medium
increases with rise in temperature
increases with moisture content
is same for all insulating materials
none of the above
Q.7
In a capacitive circuit
a steady value of applied voltage causes discharge
an increase in applied voltage makes a capacitor charge
decrease in applied voltage makes a capacitor charge
none of the above
Q.8
Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the
Voltage across the plates increases
Voltage across the plates decreases
Charge on the capacitor decreases
Charge on the capacitor increases
Q.9
The presence of an uncharged conductor near a charged one increases the
charge of the charged conductor
capacity of the charged conductor
potential of the charged conductor
all of the above
Q.10
The inverse of capacitance is called
reluctance
conductance
susceptance
elastance
Q.11
A capacitor consists of
two insulators separated by a conductor
two conductors separated by an insulator
two insulators only
two conductors only
Q.12
What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it ?
It will become magnetic
It will melt
It will get punctured or cracked
Its molecular structure will get changed
Q.13
The force between two charges is 120 N. If the distance between the charges is doubled, the force will be
60 N
30 N
40 N
15 N
Q.14
What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ?
50 pF
100 pF
150 pF
200 pF
Q.15
A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?
Paper capacitor
Ceramic capacitor
Electrolytic capacitor
Any-of the above
Q.16
Air capacitors are generally available in the range
10 to 400 pF
1 to 20 pF
100 to 900 pF
20 to 100 pF
Q.17
If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because
varying voltage produces the charging and dicharging currents
of high peak value
charging current can flow
discharge current can flow
Q.18
The relative permittivity has the following units
F/m
m/F
Wb/m
no units
Q.19
If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be
800 uC
900 uC
1200 uC
1600 uC
Q.20
A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is
50 joules
150 joules
200 joules
250 joules
Q.21
In a capacitor the electric charge is stored in
metal plates
dielectric
both (A) and (B)
none of the above
Q.22
The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by
CIR
1/RC
RC
RIC
Q.23
For making a capacitor, it is better to select a dielectric having
low permittivity
high permittivity
permittivity same as that of air
permittivity slightly more than that of air
Q.24
The power dissipated in a pure capacitor is
zero
proportional to applied voltage
proportional to value of capacitance
both (B) and (C) above
Q.25
The breakdown voltage for paper capacitors is usually
20 to 60 volts
200 to 1600 volts
2000 to 3000 volts
more than 10000 volts
Q.26
Which of the following capacitors is marked for polarity ?
Air
Paper
Mica
Electrolytic
Q.27
An electrolytic capacitor is generally made to provide
low capacitance
fixed capacitance
variable capacitance
large value of capacitance
Q.28
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is
Charged
Short-circuited
Lossy
Satisfactory
Q.29
The ability of charged bodies to exert force on 6ne another is attributed to the existence of
electrons
protons
neutrons
electric field
Q.30
Electric displacement is a______quantity.
scalar
vector
both of the above
none of the above
0 h : 0 m : 1 s
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