**Capacitors Questions and Answers**

**1. A capacitor has a voltage difference of 10 V across the plates. It has stored charges of 1000 micro-coulombs. What is the capacitance value?**

**100 μF****10 pF****0.01 μF****100 pF**

Solution: **(1) . 100 μF. **

**Answer Hints:** We know that capacitance is given as C = Q / V

Q is the amount of charges stored by the capacitor. V is the voltage in between the plates.

Using the equations, we get – C = (1000 * 10 ^{-6}) / 10 = 100 μF

**Click here for Concept of Capacitor!**

**2. The plates of parallel plate capacitor is right angle in shape. Two sides of them are 2 cm in size. The distance in between two plate given as:** **0.1 cm. What will be the capacitance value if the permittivity of the dielectric is 10**^{-11} F/m?

^{-11}F/m?

**1 x 10**^{-14}F**2 x 10**^{-12}F**2 x 10**^{-14}F**1 x 10**^{-12}F

Solution: **(2) . 2 x 10^{-12} F. Try to solve without using the hints!.**

**Answer Hints:** The formula of capacitance is given as-

C =ε A/ d

Here C is the capacitance, ε Refers to the medium’s permittivity. d is the distance. The side of the triangles is – 2cm or 0.02m.

The surface area= ½ * 0.02 * 0.02 = 2×10^{-4}

ε = 10^{-11} F/m d = 0.001m

So, C = 2 x 10^{-12} F

**3. Find out the equivalence capacitance.**

**1/3 pF****1 pF****3 pF****9 pF**

Solution: **(4). 9pF. **

**Answer Hints:** As we can see that The connection is in parallel..

The equivalent parallel capacitance is stated as C_{eq} = C_{1} + C_{2 }+ C_{3} + … + C_{N}

So, the equivalent capacitance is = 3+3+3 = 9 pF

**4. Find out the equivalence capacitance of the circuit.**

**1/3 pF****1 pF****3 pF****9 pF**

Solution:* (2). 1 pF. *

**Answer Hints:** As we can see, the capacitors are in series connection.

The equivalent series capacitance is stated as 1 / C_{eq} = 1 / C_{1} + 1 / C_{2 }+ 1 / C_{3} + … + 1 / C_{N}

So, the equivalent capacitance is = 1 / (1 / 3+1 / 3+1 / 3) = 3/3 = 1 pF

**5. A capacitor has a capacitance value of 1 micro-farad. What does it imply?**

**It stores one coulomb of charge****It holds 6.24 x 10**^{12}electrons**It stores one volt****It stores one A of current**

Solution: *(2). It holds 6.24 x 10 ^{12} electrons.*

**6. What is the effect on capacitive reactance values if the capacitors are connected in series?**

**An increase in total Xc****A decrease in real Xc****No change in real Xc****Reactance does not depend on connectivity.**

Solution:* (1). An increase in total Xc*

**7. How an electrostatic field varies if the charge difference is given?**

**Plate differential****Plate Distance****Dielectric Quantity****Plate Area**

Solution: *4). Plate Area*

**8. How the capacitance of a parallel plate capacitor can be decreased?**

**Increasing the gap between the plates****If the charge of the capacitor is increased.****Decreasing the gap between the plates****If the charge of the capacitor is decreased.**

Solution:* (1). Increasing the gap between the plates*

**9. A capacitor and an output resistor are connected in series. The circuit will function like –**

Solution: *(4). High pass filter.*

**10. Which type of material is used between the plates of the capacitor?**

**Diodes****Materials with high impedance****Plate divider material****Dielectric Material**

Solution: *(4). Dielectric material.*

**11. Which material has the highest dielectric value in the below options?**

**Mica****Air****Paper****Wood**

Solution: **(1). Mica**

**12. What is the phase difference for voltage and current in a capacitor only circuit?**

**The voltage lead by 90 degrees****The current lead by 90 degrees****The voltage lag by 180 degrees****The voltage and current has no phase differences.**

Solution: **(2). The current lead by 90 degrees.**

**13. What is the effect on capacitance if the dielectric constant is decreased?**

**It remains the same****It increases****It decreases****The capacitor does not function.**

Solution: *(3). It decreases*

**14. Which of the following is true about capacitor?**

**C = Q / V****V = Q * C****C = R * I****Q = I / V**

Solution: **(1). C = Q / V **

**15. What is the S.I. unit of capacitor?**

**Henry****Ohm****Volt / Amp****Farad**

Solution: *(4) Farad*

**16. What is the value of the Q factor of a capacitor?**

**Q = 1 / RC****Q = 1 / (RC)**^{1/2}**Q = 1 / ωCR****Correct option is not given**

Solution: **(3). 1 / ωCR**

**17. What is the capacitor’s time constant?**

**τ**_{0 }= 1 / C**τ**_{0 }= RC**τ**_{0 }= 1/RC**τ**_{0 }= C

Solution:* (2). τ _{0 }= RC*

**18. Comment Truth or False based on the sentence given.**

**Statement: ***Air can serve as the dielectric for the capacitor.*

*Air can serve as the dielectric for the capacitor.*

**True****False**

Solution: *(1). True*

**19. What is dissipation factor for a ceramic capacitor?**

**tan δ = ESR * ωC****tan δ = ESR * 1 / C****tan δ = 1 / (ESR * ωC)****tan δ = ESR * C**

Solution: *(1). tan δ = ESR * ωC*

*What is dissipation factor? Click to Know!*

*What is dissipation factor? Click to Know!*

**20. What type of ceramic capacitor provides higher stability?**

**Class 1 type****Class 2 type****Ceramic Disc Capacitor****MLCC**

Solution:* (1). Class 1 type*

**21. Which dielectric is used for tantalum metal?**

**Tantalum Aluminium Di-Oxide****Tantalum Niobium Phosphide****Tantalum pentoxide****Tantalum phosphide**

Solution: *(3). Tantalum pentoxide*

**22. Which type of capacitor has the highest CV product?**

**Ceramic capacitor****Tantalum electrolytic capacitor****Coupling capacitor****bypass capacitor**

Solutions: *(2). Tantalum Electrolytic capacitors.*

*Know everything about Tantalum Electrolytic Capacitors…Click to proceed….*

*Know everything about Tantalum Electrolytic Capacitors…Click to proceed….*

**23. What is surge voltage?**

**The minimum voltage received from the load.****The maximum voltage received from the load.****The maximum peak voltage applied.****The minimum peak voltage applied.**

Solution: (3). *The maximum peak voltage applied.*

**24. Comment Truth or False based on the sentence given.**

**Statement: ***Capacitors are polarized.*

*Capacitors are polarized.*

**True****False**

Solution: *(1). True*

**25. How much energy will be stored in a capacitor if the applied voltage is V?**

**½ CV**^{2}**½ CV****CV**^{2}**1/4 CV**^{2}

Solution: *(1). ½ CV ^{2}*

*How energy is being stored in a capacitor? Click for answer!*

*How energy is being stored in a capacitor? Click for answer!*

**26. Condenser is currently known as –**

**Filters****Rectifiers****Capacitors****Diodes**

Solution: *(3). Capacitors*

**27. How the impedance of a capacitor is represented in Laplace transform?**

**Z(s) = s / C****Z(s) = 1 / sC****Z(s) = 1 / s**^{2}C**Z(s) = S**^{2}/ C

Solution: **(2). Z(s) = 1 / sC**

**28. What will be the effect of increasing the electrode area of a plate capacitor?**

**The capacitance remains the same.****The energy stored by the capacitor gets decreased.****The capacitance value gets reduced.****The energy stored by the capacitor gets increased.**

Solution: *(4). The energy stored by the capacitor gets increased.*

**29. Which of the following is the symbol for a bipolar dielectric capacitor?**

Solution:* (4).*

**30. Which organization gives the standardization for all electrical components, including capacitors?**

**IEEE(Institute of Electrical and Electronics Engineers**)**NMEA(National Marine Electronics Association)****IEC(International Electrotechnical Commission)****Correct option is not given**.

Solution: *(3).IEC (International Electrochemical Commission).*

**31. How quality factor is related with Dissipation Factor?**

**Q = 1 / tan δ****Q = 1 / tan**^{2}δ**Q = tan δ****Q = 1 / ESR * tan δ**

Solution: *(1). Q = 1 / tan δ*

**32. Which type of capacitor provides high volumetric efficiency?**

**Ceramic Capacitors of Class 1****Ceramic Capacitors of Class 2****Ceramic Capacitors of Class 3****Ceramic Capacitors of Class 4**

Solution:* (2). Ceramic Capacitors of Class 2*

**33. How does frequency is related to the capacitance of a capacitor?**

**An increase in the frequency will cause a increase in the capacitance.****An increase in the frequency will cause a decrease in the capacitance.****Increasing the frequency will not affect the capacitance.****Decreasing the frequency will decrease the capacitance.**

Solution: *(2). An increase in the frequency will cause a decrease in the capacitance.*

**34. What is voltage proof for a ceramic capacitor?**

**The surge voltage****The applied voltage****The load voltage****The rated voltage.**

Solution: **(4). The rated voltage.**

**35. When does the resonance occurs in a ceramic capacitor?**

**When the imaginary parts of the capacitor impedance and admittance cancel each other.****When the imaginary parts of the capacitor impedance and admittance do not exist.****When the imaginary parts of the capacitor impedance have a higher value than admittance.****When the imaginary parts of the capacitor impedance have a lower cost than admittance.**

Solution: *(1) When the imaginary parts of the capacitor impedance and admittance cancel each other.*

**36. What is the dielectric absorption for a class 1 ceramic capacitor?**

**1% to 3%****7% to 9%****0.3% to 0.6%****0.1% to 0.3%**

Solution:** (3). 0.3% to 0.6%**

**37. A capacitor is rated as 105K 240 V. What is the capacitance of the capacitor?**

**10 µF****105 µF****240 µF****1 µF**

Solution: **(4). 1 µF**

**38. A capacitor is rated as 105M 240 V. What is the capacitor’s tolerance value?**

**±10%****±20%****±30%****±40%**

Solution:* (2). ±20%*

**39. What is MLCC?**

**Multipurpose Liquid Ceramic Capacitors****Multipurpose Leakage Ceramic Capacitors****Multi-layer Crystalline Capacitors****Multi-layer Ceramic Capacitors**

Solutions: *(4). Multi-layer Ceramic Capacitors*

**40. Which type of capacitor is used in transistor circuits?**

**Air****Bypass****Paper****Ceramic**

Solution: *(4). Ceramic*

**41. Which bridge is used for measuring capacitance?**

**Wheatstone Bridge****Schering Bridge****Both (A) and (B)**.**Correct option is not given**

Solution: *(2). Schering Bridge*

**42. Which type of capacitor has a short shelf life than others?**

**Electrolytic Capacitor****Ceramic Capacitor****Both (A) and (B)****None of the above**

Solution: *(1). Electrolytic Capacitor*

**43. Which type of capacitor is useful in high-frequency circuits?**

**Ceramic capacitors****Mica Capacitors****Bypass Capacitors****Air Capacitors**

Solution: *(2). Mica capacitors*

**44. Which type of capacitor is used in R.F. tuning?**

**Ceramic Capacitor****Parallel Plate Capacitors****Electrolytic capacitors****Mica Capacitors**

Solution: *(3). Electrolytic capacitors*

**45. Which type of capacitor is used for D.C. voltage?**

**Ceramic Capacitor****Parallel Plate Capacitors****Electrolytic capacitors****Mica Capacitors**

Solution: *(3). Electrolytic capacitors*

**46. Where does the electric charge is stored in a capacitor?**

**The Dielectric Material****The parallel Plates****Correct option is not given**.**Both (A) and (B)**

Solution: *(1). The Dielectric Material*

**47. Comment Truth or False based on the sentence given.**

**Statement: Both Electric field and magnetic field are associated with capacitors.**

**True****False**

Solution: *(2). False*

**48. Comment Truth or False based on the sentence given.**

**Statement: If the voltage across the capacitor is doubled, the energy stored will be doubled.**

**True****False**

Solution: *(1). True*

**49. What is the value of true power inside a capacitor?**

**More than 0****Equals to 0****Lies in the range of 0 to 1****Correct option is not given**

Solution: *(2). Equals to 0*

**50. How many time constants are required to charge a capacitor completely?**

**5****4****2.5****2**

Solution: **(1). 5**

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