Capacitance | Electric Field | Questions and Answers | Electrical Questions
There are many Questions and Answers provided regarding to electric field and capacitance, which will be more helpful in electrical viva questions and also in GATE examination for all electrical engineer.
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| Capacitance | Electric Field | Questions and Answers | Electrical Questions |
Questions and Answers
Q.1. The electric field intensity at a point
situated 4 meters from a point charge
is 200 N/C. If the distance is reduced to
2 meters, the field intensity will be
(a)400N/C
(b)600N/C
(c)800N/C
(d)1200N/C
Ans.
(c)800N/C
Q.2. Electric intensity(E)at any point in an
electric field is equal to
(a)potential gradient
(6)(potential gradient)2
(c)(potential gradient)1/2
(d)(potential gradient)1/3
Ans.
(a)potential gradient
Q.3. The lines of force due to charged par-
ticles are
(a)always straight
(b)always curved
(c)sometimes curved
(d)none of the above
Ans.
(b)always curved
Q.4. The electric field at a point situated at
a distance d from straight charged con-
ductor is
(a)proportional to d
(b)inversely proportional to d
(c)inversely proportional to d
(d)none of the above
Ans.
(b)inversely proportional to d
Q.5. The direction of electric field due to
positive charge is
(a)away from the charge
(b)towards the charge
(c)both(a)and(b)
(d)none of the above
Ans.
(a)away from the charge
Q.6. A field line and an equipotential sur-
face are
(a)always parallel
(b)always at 90
(c)inclined at any angle 0
(d)none of the above
Ans.
(b)always at 90
Q.7. The ability of charged bodies to exert
force on one another is attributed to the
existence of
(a)electrons
(b)protons
(c)neutrons
(d)electric field
Ans.
(d)electric field
Q.8. If the sheet of a Bakelite is inserted
between the plates of an air capacitor,
the capacitance will
(a)decrease
(b)increase
(c)remains unchanged
(d)become zero
Ans.
(b)increase
Q.9. A capacitor stores 0.24 coulombs at 10
volts. Its capacitance is
(a)0.024F
(b)0.12F
(c)0.6F
(d)0.8F
Ans.
(a)0.024F
Q.10 For making a capacitor, it is better to
select a dielectric having
(a)low permittivity
(b)high permittivity
(c)permittivity same as that of air
(d)permittivity slightly more than that
of air
Ans.
(b)high permittivity
Q.11. The units of capacitance are
(a)volts/coulomb
(b)coulombs/volt
(c)ohms
(d)henry/Wb
Ans.
(b)coulombs/volt
Q.12. If three 15 uF capacitors are connected
in series, the net capacitance is
(a)5uF
(b)30 uF
(c)45 uF
(d)50 uF
Ans.
(a)5uF
Q.13. If three 10 uF capacitors are connected
in parallel, the net capacitance is
(a)20 F
(b)30uF
(c)40uF
(d)50 uF
Ans.
(b)30uF
Q.14. A dielectric material must be
(a)resistor
(b)insulator
(c)good conductor
(d)semi conductor
Ans.
(b)insulator
Q.15. An electrolytic capacitor can be used for
(a)D.C. only
(b)A.C. only,
(c)both D.C.as well as A.C.
Ans.
(a)D.C. only
Q.16. The capacitance of a capacitor is not
affected by
(a)distance between plates
(b)area of plates
(c)thickness of plates
(d)all of the above
Ans.
(c)thickness of plates
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