Q.1. 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
(a)voltage across the plates increases
(b)voltage across the plates decreases
(c)charge on the capacitor decreases
(d)charge on the capacitor increases
Ans.
(b)voltage across the plates decreases
Q.2. If A.C. voltage is applied to capacitive
circuit, the alternating current can flow
in the circuit because
(a)varying voltage produces the charg
ing and discharging currents
(b)of high peak value
(c)charging current can flow-
(d)discharge current can flow
Ans.
(a)varying voltage produces the charg
ing and discharging currents
Q.3. Voltage applied across a ceramic di-
electric produces an electrolytic field
100 times greater than air. What will
be the value of dielectric constant?
(a)50
(b)100
(c)150
(d)200
Ans.
(b)100
Q.4. Which of the following statements is.
correct?
(a)Air capacitors have a black band to
indicate the outside foil.
(b)Electrolytic capacitor must be con-"
nected in the correct polarity
(c)Ceramic capacitors must be con-
nected in the correct polarity
(d)Mica capacitors are available in
capacitance value of 1 to 10 uF
Ans.
(b)Electrolytic capacitor must be con-"
nected in the correct polarity
Q.5. The dissipation factor of a good di-
electric is of the order of
(a)0.0002
(b)0.002
(c)0.02
(d)0.2
Ans.
(a)0.0002
Q.6. "The total electric flux through any
closed surface surrounding charges is
equal to the amount of charge enclosed”.
The above statement is associated with
(a)Coulomb's square law
(b)Gauss's law
(c)Maxwell's first law
(d)Maxwell's second law
Ans.
(b)Gauss's law
Q.7. Three capacitors each of the capacity C
are given. The resultant capacity 2/3C
can be obtained by using them
(a)all in series
(b)all in parallel
(c)two in parallel and third in series
with this combination
(d)two in series and third in parallel
across this combination
Ans.
(c)two in parallel and third in series
with this combination
Q.8. For which of the following parameter
variation, the capacitance of the
capacitor remains unaffected?
(a)Distance between plates
(b)Area of the plates
(c)Nature of dielectric
(d) Thickness of the plate
Ans.
(d) Thickness of the plate
Q.9. Which of the following statement is
true?
(a)The current in the discharging
capacitor grows linearly
(b)The current in the discharging
capacitor grows exponentially
(c)The current in the discharging
capacitor decays exponentially
(d)The current in the discharging
capacitor decreases constantly
Ans.
(b)The current in the discharging
capacitor grows exponentially
Q.10. Which of the following expression is
correct for electric field strength?
(a)E=D/€
(b)E=(D)2/€
(c)E=Ï€D.
(d)E=Ï€(D)2
Ans.
(a)E=D/€
Q.11. In a capacitor the electric charge is
stored in
(a)metal plates
(b)dielectric
(c)both(a)and(6)
(d)none of the above
Ans.
(b)dielectric
Q.12. Which of the following materials has
the highest value of dielectric cons-
tant?
(a)Glass
(b)Vacuum
(c)Ceramics
(d)Oil
Ans.
(c)Ceramics
Q.13. Which of the following capacitors will
have the least variation?
(a)Paper capacitor
(b)Ceramic capacitor
(c)Silver plated mica capacitor
(d)None of the above
Ans.
(c)Silver plated mica capacitor
Q.14. Which of the following statements is
incorrect?
(a)The leakage resistance of ceramic
capacitors is generally high
(b)The stored energy in a capacitor
decreases with reduction in value of
capacitance
(c)The stored energy in a capacitor
increases with applied voltage
(d)A wire cable has distributed capaci-
tance between the conductors.
Ans.
(b)The stored energy in a capacitor
decreases with reduction in value of
capacitance
Q.15. Which of the following capacitors has
relatively shorter shelf life?
(a)Mica capacitor
(b)Electrolytic capacitor
(c)Ceramic capacitor
(d)Paper capacitor
Ans.
(b)Electrolytic capacitor
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