Electrostatic Multiple Choice Questions and Answers-1 (English)

1. The unit of capacitance is
(A)henry
(B)ohm
(C)farad
(D)farad/m
Ans: C

2. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be
(A)10 F
(6) 10 uF
(C)100 nF
(D)1000 uF
Ans: B

3. A dielectric material must be
(A)resistor
(B)insulator
(C)good conductor
(D)semi conductor
Ans: B

4. Which of the following material has least value of dielectric constant ?
(A)Ceramics
(B)Oil
(C)Glass
(D)Paper
Ans: B

5. Which of the following capacitors will have the least value of breakdown voltage ?
(A)Mica
(B)Paper
(C)Ceramic
(D)Electrolytic
Ans: D

6. The breakdown voltage for paper capacitors is usually
(A)20 to 60 volts
(B)200 to 1600 volts
(C)2000 to 3000 volts
(D)more than 10000 volts
Ans:

7. Dielectric constant for mica is nearly
(A)200
(B)100
(C)3 to 8
(D)1 to 2
Ans: C

8. Dielectric strength of mica is

(A)10 to 20 kV/mm
(6) 30 to 50 kV/mm
(C)50 to 200 kV/mm
(D)300 to 500 kV/mm
Ans: C

9. The dielectric constant (relative permittivity) of glass is given by
(A)0.1 to 0.4
(B)0.5 to 1.0
(C)2.0 to 4.0
(D)5 to 100
Ans: D

10. capacitors are mainly used for radio frequency tuning.
(A)Paper
(B)Air
(C)Mica
(D)Electrolytic
Ans: B

11. capacitors can be used only for D.C.
(A)Air
(B)Paper
(e) Mica
(D)Electrolytic
Ans: D

12. capacitors are used in transistor circuits.
(A)Ceramic
(B)Paper
(C)Air
(D)Electrolytic
Ans: A

13. capacitors are used for audio frequency and radio frequency coupling and tuning.
(A)Air
(B)Mica
(C)Plastic film
(D)Ceramic
Ans: B

14. An electrolytic capacitor can be used for
(A)D.C. only
(B)AC. only
(C)both D.C. as well as A.C.
Ans: A

15. The capacitor preferred for high frequency circuits is
(A)air capacitor
(B)mica capacitor
(C)electrolytic capacitor
(D)none of the above
Ans: B

16. The capacity of capacitor bank used in power factor correction is expressed in terms of
(A)kW
(B)kVA
(C)kVAR
(D)volts
Ans: C

17. The capacitance of a capacitor is not affected by
(A)distance between plates
(6) area of plates
(C)thickness of plates
(D)all of the above
Ans: C

18. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?
(A)Paper capacitor
(B)Ceramic capacitor
(C)Electrolytic capacitor
(D)Any-of the above
Ans: C

19. Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules
(A)CV2
(B)C2V
(C)CV2
(D)CV
Ans: A

20. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C 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