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Capacitors Question & Answers

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This article lists 100+ Capacitors MCQs for engineering students. All the Capacitors Questions & Answers given below includes solution and link wherever possible to the relevant topic.

A capacitor is a device that stores electric charge, will find capacitors in almost all circuit boards. The electrons can’t pass through the capacitor because of the insulating material. The charge has the property of an electric field and the electric field is a type of energy.

Capacitors contain two conducting materials like metal inside the capacitor, and those two metals are separated from each other with an electric insulator or a vacuum. Capacitors are used as frequency-dependent impedance and it is used for temporary energy storage.

1). ___________ stores charge
HintCapacitors stores charge
2). The parallel metal plates of the capacitor separated by ________
HintThe parallel metal plates of the capacitor separated by insulators
3). The nominal capacitance of the paper capacitors is around ________
HintThe nominal capacitance of the paper capacitors is around 0.001uF to 10uF
4). The working voltage of the paper capacitors is around ________
HintThe working voltage of the paper capacitors is around 200v to 600v
5). The typical tolerance of the paper capacitors is ________
HintThe typical tolerance of the paper capacitors is 10%
6). The temperature coefficient of the paper capacitors is ________
HintThe temperature coefficient of the paper capacitors is ±800 deg/c
7). The disadvantage of the paper capacitor is _______
HintThe disadvantage of the paper capacitor is large in size, susceptible, and hygroscopic to moisture
8). The advantage of the paper capacitor is _______
HintThe paper capacitor is low cost, stable, and the voltage rating is high
9). The dissipation factor of paper capacitors is _____
HintThe dissipation factor of paper capacitors is 1%
10). The dielectric absorption of paper capacitors is __________
HintThe dielectric absorption of paper capacitors is 2.5%
11). How many conductors does the capacitor consist of?
HintThe capacitor consists of two conductors
12). The capacitance measured in ______
HintThe capacitance measured in farads
13). The dielectric materials increase the ________
HintThe dielectric materials increase the capacitance
14). Capacitor obey _________ law
HintThe capacitor obeys coulombs law
15). The relationship between frequency, capacitance, and capacitor reactance is given by _____
HintThe relationship between frequency, capacitance, and capacitor reactance is given by 1/2πfc
16). The capacitors categorized into _______ groups
HintThe capacitors are categorized into two groups they are polarized and non-polarized capacitors
17). Which one is a polarized capacitor?
HintElectrolytic capacitor is a polarized capacitor
18). Which one is a non-polarized capacitor?
HintPolystyrene capacitor, ceramic capacitor, Teflon capacitors are non-polarized capacitors
19). _________ are the dielectric materials
HintAir or Vaccum, rubber, oil, paper, mica, glass, ceramic, etc are the dielectric materials
20). What is the standard unit of electric charge?
HintCoulombs is the standard unit of electric charge
21). To store the electric charge the ultra-capacitors uses ______ effect
HintTo store the electric charge the ultra-capacitors use double-layer effect
22). The advantages of ultra-capacitors are _______
HintThe ultra-capacitors have a long life, and the transient response is fast, efficiency is high
23). The capacitance range of supercapacitors is from ________
HintThe capacitance range of supercapacitors is from 100 farads to 5000 farads
24). The supercapacitors are also known as ________
HintThe supercapacitors are also known as ultracapacitors or electrical double-layer capacitors
25). The hybrid capacitors are categorized into ______
HintThe hybrid capacitors are categorized into three types they are composite hybrids, asymmetric hybrids, and battery type hybrids

Capacitors MCQs for Students

26). The conducting polymers and metal oxides are ____________ capacitors
HintThe conducting polymers and metal oxides are pseudocapacitors
27). The activated carbons, carbon nanotubes, carbon aerogels are _______ type of capacitors
HintThe activated carbons, carbon nanotubes, carbon aerogels are double-layer capacitors
28).The disadvantages of supercapacitors are ________
HintThe supercapacitors are high cost, and it has high self-discharge rate, and it cannot be used in AC and high-frequency circuits
29). Which one is a variable capacitor?
HintA ceramic trimmer capacitor is a variable capacitor
30). Which one is a type of miscellaneous capacitor?
HintAir gap capacitors are a type of miscellaneous capacitor
31). The supercapacitors are categorized into __________
HintThe supercapacitors are categorized into two types they are pseudo capacitors, and double-layer capacitors
32). Which one is a film-based capacitor?
HintMetalized paper power capacitor, paper film/foil power capacitor, and pp film/foil power capacitor are film based capacitors
33). The minimum film thickness of polyester is ___
HintThe minimum film thickness of polyester is 0.7-0.9µm
34). The minimum film thickness of polyethylene sulfide is ___
HintThe minimum film thickness of polyethylene sulfide is 1.2µm
35). The minimum film thickness of polyethylene naphthalate is ___
HintThe minimum film thickness of polyethylene naphthalate is 0.9-1.4µm
36). The capacitance range of polyester is ____________
HintThe capacitance range of polyester is 100PF to 22µF
37). The capacitance range of polyethylene naphthalate is ____________
HintThe capacitance range of polyethylene naphthalate is 100PF to 1µF
38). The capacitance range of polyethylene sulfide is ____________
HintThe capacitance range of polyethylene sulfide is 100PF to 0.47µF
39). The capacitance range of polypropylene is ____________
HintThe capacitance range of polypropylene is 100PF to 10µF
40). The dielectric strength of polyester is ________
HintThe dielectric strength of polyester is 580V/µm
41). The dielectric strength of polyethylene napthalate is ________
HintThe dielectric strength of polyethylene napthalate is 500V/µm
42). The dielectric strength of polyphenylene sulfide is ________
HintThe dielectric strength of polyphenylene sulfide is 470V/µm
43). The dielectric strength of polypropylene is ________
HintThe dielectric strength of polypropylene is 650V/µm
44). The electrolytic capacitors are categorized into _______ families according to their dielectric
HintThe electrolytic capacitors are categorized into three families according to their dielectric they are aluminum, tantalum, niobium electrolytic capacitors
45). The ____________ capacitors are fixed capacitors
HintThe non-polarized capacitors are fixed capacitors
46). Niobium oxide capacitor is a type of ________ capacitor
HintNiobium oxide capacitor is a type of solid electrolyte capacitor
47). Which capacitor do stores charge electrochemically?
HintPseudo capacitor stores charge electrochemically
48). The polyester capacitors are categorized into ________ types
HintThe polyester capacitors are categorized into two types they are metalized film and foil capacitors
49). The maximum capacitor value of super capacitor is ________
HintThe maximum capacitor value of super capacitor is 12000F
50). Which type of energy does the capacitor store?
HintCapacitor stores potential energy

Capacitors MCQs for Interviews

51). After long time capacitor blocks ________
HintAfter a long time capacitor blocks DC
52). The DC voltage range of polyester is _______
HintThe DC voltage range of polyester is 50-1000V
53). The DC voltage range of polyethylene napthalate is _______
HintThe DC voltage range of polyethylene napthalate is 16-250V
54). The DC voltage range of polypropylene is _______
HintThe DC voltage range of polypropylene is 16-100V
55). The DC voltage range of polyphenylene sulfideis _______
HintThe DC voltage range of polyphenylene sulfide is 40-2000V
56). Which capacitor do stores charge electro statically?
HintDouble-layer capacitors stores charge electro-statically
57). ______ is a passive device
HintThe capacitor is a passive device
58). The metals have _________
HintThe metals have high capacitance
59). In transistor circuits _________ capacitors are used
HintIn transistor circuits ceramic capacitors are used
60). Which capacitor do stores charge electrochemically and electro-statically?
HintHybrid capacitors stores charge electrochemically and electro-statically
61). _________ capacitors are used for tuning, radiofrequency coupling, and audio frequency
HintMica capacitors are used for tuning, radiofrequency coupling, and audio frequency
62). ___________ capacitors are used in communication transmitters
HintVariable capacitors are used in communication transmitters
63). The value range of ceramic capacitors is from __________
HintThe value range of ceramic capacitors is from few picofarads to 0.1 microfarads
64). The features of micro capacitors are _______
HintThe features of micro capacitors are low tolerance, very accurate, and low resistive inductive losses
65). The features of ceramic capacitors are ______
HintThe features of ceramic capacitors are low capacitance per unit volume, low loss factor, and a reasonable level of stability
66). The features of paper capacitors are _________
HintThe features of paper capacitors are low capacitance, high working voltage and current, and high leakage rates
67). The features of thin-film capacitors ___________
HintThe features of thin-film capacitors high stability, low cost, low losses even at high frequencies, and long shelf life
68). The frequency of electrolytic capacitor are ________
HintThe frequency of electrolytic capacitor are limited frequency response, high capacitance and voltage ranges are available, and high leakage current and aging
69). The tantalum _________
HintThe tantalum allows a large current to pass, reliable, and stable over time
70). The charging time of super capacitors is _______
HintThe charging time of super capacitors is 1-10seconds
71). The service life of supercapacitors is _______
HintThe service life of supercapacitors is 10-15seconds
72). The capacitors used in _________
HintThe capacitors used in energy storage systems, signal processing devices, filter applications, etc
73). Based on the dielectric materials the SMD capacitors categorized into ______ types
HintBased on the dielectric materials the SMD capacitors categorized into three types they are multilayer ceramic, tantalum, and electrolytic capacitors
74). The advantages of SMD capacitors are __________
HintThe advantages of SMD capacitors are small in size, less cost, and high performance
75). The disadvantages of SMD capacitors are ________
HintThe disadvantages of SMD capacitors are low heat capacity and due to its size the manual operation is difficult

Capacitors MCQs for Exams

76). What is the standard form of SMD capacitor?
HintThe standard form of SMD capacitor is Surface Mount Device
77). The ceramic capacitors used in _________
HintThe ceramic capacitors used in printed circuit boards, transmitter stations, power circuit breakers, etc
78). The polyester capacitors used in __________
HintThe polyester capacitors used in dc applications, small in size, and most cost-effective
79). The temperature coefficient of PET capacitor is _________
HintThe temperature coefficient of PET capacitor is ±5.0%
80). The temperature coefficient of X7R is _________
HintThe temperature coefficient of X7R is ±15.0%
81). The dielectric absorption of PET capacitor is ________
HintThe dielectric absorption of PET capacitor is 0.5%
82). The dielectric strength of barium titanate is ___________
HintThe dielectric strength of barium titanate is 2-10Kv/mm
83). The dielectric strength of paper is ___________
HintThe dielectric strength of paper is 14Kv/mm
84). The dielectric strength of glass is ___________
HintThe dielectric strength of glass is 15Kv/mm
85). The dielectric strength of mica is ___________
HintThe dielectric strength of mica is 63Kv/mm
86). 100 PF is equal to ________
Hint100 PF is equal to 0.1nF
87). 1000 PF is equal to ________
Hint1000 PF is equal to 1nF
88). 100 nF is equal to ________
Hint100 nF is equal to 0.1µF
89). The relative permittivity is defined as the ratio of _____________
HintThe relative permittivity is defined as the ratio of electric flux density divided by electric field strength
90). The paper capacitors used in ______ applications
HintThe paper capacitors used in high current and high voltage applications
91). Which one is a type of film capacitor?
HintAxial style is a type of film capacitor
92). The nominal capacitance range of niobium electrolyte capacitor is _______
HintThe nominal capacitance range of niobium electrolyte capacitor is 1uF to 1500uF
93). The working voltage of niobium electrolytic capacitor is from _________
HintThe working voltage of niobium electrolytic capacitor is from 10V to 16V
94). The disadvantage of the niobium electrolytic capacitor is _____________
HintThe disadvantage of the niobium electrolytic capacitor is voltage rating is low and the operating losses are high
95). The advantage of niobium electrolytic capacitor is _____________
HintThe advantage of niobium electrolytic capacitor is low cost, reliable, and high volumetric capacitance
96). The nominal capacitance of tantalum electrolytic capacitor is from _______
HintThe nominal capacitance of tantalum electrolytic capacitor is from 0.1uF to 1000uF
97). The working voltage of tantalum electrolytic capacitor is from _______
HintThe working voltage of the tantalum electrolytic capacitor is from 6V to 100V
98). Typical tolerance of tantalum electrolytic capacitor is _______
HintThe typical tolerance of tantalum electrolytic capacitor is 20%
99). The nominal capacitance of an aluminum electrolytic capacitor is from _______
HintThe nominal capacitance of an aluminum electrolytic capacitor is from 0.1uF to 47000uF
100). What is the standard form of EDLC?
HintThe standard form of EDLC is Electric/electrochemical Double Layer Capacitor

Capacitors MCQs for Quiz

101). The electric/electrochemical double-layer capacitor works on _______ layer capacitance principle
HintThe electric/electrochemical double-layer capacitor works on the double-layer capacitance principle
102). The electrolyte is used as a ______ in electrolyte capacitors
HintThe electrolyte is used as a conductor in electrolyte capacitors
103). The coulombic efficiency of the capacitor is about _______
HintThe coulombic efficiency of the capacitor is about 100%
104). The coulombic efficiency of the super capacitor is _______
HintThe coulombic efficiency of the super capacitor is up to 99%
105). The coulombic efficiency of the battery is about _______
HintThe coulombic efficiency of the battery is about 70-80%
106). The charge storage determinants of the capacitor is _______
HintThe charge storage determinants of the capacitor is electrode area and dielectric
107). The charge storage determinants of the super capacitor are _______
HintThe charge storage determinants of the supercapacitor are the microstructure of electrode and electrolyte
108). The charge storage determinants of battery is _______
HintThe charge storage determinants of battery are thermodynamics and active mass
109). The discharge time of the battery is ________
HintThe discharge time of the battery is 0.03 to 3hr
110). The charge time of the battery is ________
HintThe charge time of the battery is 1 to 5hrs
111). What is the standard form of GCD?
HintThe standard form of GCD is Galvanostatic Charge/Discharge
112). The charge time of lithium-ion is _________
HintThe charge time of lithium-ion is 10-60minutes
113). The cell voltage of lithium-ion is _________
HintThe cell voltage of lithium-ion is 3.6 to 3.7V
114). The cell voltage of super capacitor is _________
HintThe cell voltage of super capacitor is 2.3 to 2.7V
115). The service life of lithium-ion is ______
HintThe service life of lithium-ion is 5-10years
116). The advantages of polystyrene capacitor is _________
HintThe polystyrene capacitors have low leakage, low distortion, and high insulation
117). The disadvantages of polystyrene capacitor is _________
HintThe polystyrene capacitors are not heat resistance, and it has low dielectric absorption and good temperature stability
118). The dielectric constant value of polystyrene capacitors is _______
HintThe dielectric constant value of polystyrene capacitors is between 2.5-2.6
119). The dielectric constant value of mica capacitors is _______
HintThe dielectric constant value of mica capacitors is 6
120). The mica capacitors categorized into _________ types
HintThe mica capacitors categorized into two types they are damped mica capacitor and silver mica capacitor
121). The mica capacitors used in __________
HintThe mica capacitors used in radio or TV transmitters, coupling and resonant circuits, etc
122). The properties of mica capacitor are __________
HintThe mica capacitors are temperature coefficient, and it has high accuracy and high Q
123). Which one is used as a dielectric in silver mica capacitor?
HintMica is used as a dielectric in silver mica capacitor
124). The characteristics of mica capacitors are ________
HintLow losses, stability, accuracy, and tolerance are the characteristics of mica capacitors
125). The capacitors _______
HintThe capacitors stop DC but it allows AC to pass and it stores voltage in the form of a dielectric field

Capacitors MCQs for Engineers

126). The function of capacitor in a circuit is _______
HintThe function of a capacitor in a circuit is to prevent loss of information, ac/dc conversion, reactive power control, and electric charge storage
127). The advantages of ceramic capacitor is _______
HintThe advantages of ceramic capacitors are they are available in both SMD and lead packages, the frequency performance is high, and it is cheap to manufacture
128). In transistor circuits _______ capacitor is used
HintIn transistor circuits ceramic capacitor is used

Read more about Transistors

129). The dielectric material in air gap trimmer capacitors is _____
HintThe dielectric material in air gap trimmer capacitors is air
130). The dielectric material in SF6 gas-filled tunning capacitors is _____
HintThe dielectric material in SF6 gas-filled tunning capacitors is SF6
131). The dielectric material in glass capacitors is _____
HintThe dielectric material in glass capacitors is glass
Read more about Dielectric Materials
132). The wet tantalum capacitors used in _______
HintThe wet tantalum capacitors used in space, avionics, and consumer applications, etc
133). Which one is used as dielectric in tantalum capacitors?
HintNiobium pentoxide, manganese dioxide, and tantalum pentoxides are used as dielectric in tantalum capacitors
134). In a capacitor, the relation between voltage and current is ______
HintIn a capacitor, the relation between voltage and current is I=C dv/dt
135). The capacitor act as short circuit for _________
HintThe capacitor act as a short circuit for high frequencies
Read more about Capacitors
136). The capacitor act as an open circuit for _________
HintThe capacitor act as an open circuit for low frequencies
137). The capacitors ____________ in an exponential manner
HintThe capacitors discharge and charge in an exponential manner
138). The dielectric constant of air is ________
HintThe dielectric constant of air is unity
139). When capacitors connected in series ______ remains same and _______ varies
HintWhen capacitors connected in series charge remains same and voltage varies
140). For _____________ charge the gauss law is applicable
HintFor sheet charge, point charge, and the line charge the gauss law is applicable
141). The flux density increases when charge _____
HintThe flux density increases when charging increases
143). The ratio of actual to absolute permittivity is known as a _______ permittivity
HintYes, the ratio of actual to absolute permittivity is known as a relative permittivity
144). When actual permittivity decreases the relative permittivity __________
HintWhen actual permittivity decreases the relative permittivity decreases
145). If relative permittivity increases the absolute permittivity __________
HintIf relative permittivity increases the absolute permittivity remains the same
146). There is no unit for the ____________ permittivity
HintThere is no unit for the relative permittivity
147). While the capacitor is charging the final current of a capacitor is ________
HintWhile the capacitor is charging the final current of a capacitor is zero
148). While the capacitor is charging the initial current of a capacitor is very high
HintYes, while the capacitor is charging the initial current of a capacitor is very high
149). The capacitor acts as an ______ circuit at DC
HintThe capacitor acts as an open circuit at DC
150). The aluminum electrolyte capacitors are not suitable for ________
HintThe aluminum electrolyte capacitors are not suitable for coupling, decoupling, and attenuation

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