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