Capacitors Question & Answers June 5, 2021 By WatElectronics 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. The capacitors are categorized into two groups they are polarized and non-polarized capacitors. The polystyrene capacitor, ceramic capacitor, Teflon capacitors are non-polarized capacitors. Air or Vaccum, rubber, oil, paper, mica, glass, ceramic, etc are the dielectric materials. The ultra-capacitors have a long life, fast transient response, and high efficiency. To store the electric charge the ultra-capacitors use a double layer effect. Supercapacitors are also known as ultracapacitors or electrical double-layer capacitors. The supercapacitors are high cost, it has a high self-discharge rate, and cannot be used in AC and high-frequency circuits. 1). ___________ stores charge Capacitors Resistors Both a and b None of the above Hint 2). The parallel metal plates of the capacitor separated by ________ Insulators Isolators Both a and b None of the above Hint 3). The nominal capacitance of the paper capacitors is around ________ 0.1uF to 10uF 0.01uF to 10uF 0.001uF to 10uF 0.5uF to 10uF Hint 4). The working voltage of the paper capacitors is around ________ 100v to 200v 200v to 300v 300v to 600v 200v to 600v Hint 5). The typical tolerance of the paper capacitors is ________ 2% 4% 6% 10% Hint 6). The temperature coefficient of the paper capacitors is ________ ±100 deg/c ±400 deg/c ±800 deg/c ±1000 deg/c Hint 7). The disadvantage of the paper capacitor is _______ Size Suspectible and hygroscopic to moisture Both a and b None of the above Hint 8). The advantage of the paper capacitor is _______ Low cost Voltage rating is high Stable All of the above Hint 9). The dissipation factor of paper capacitors is _____ 1% 4% 6% 10% Hint 10). The dielectric absorption of paper capacitors is __________ 2.5% 4% 6% 10% Hint 11). How many conductors does the capacitor consist of? One Two Three Four Hint 12). The capacitance measured in ______ Watts Henry Farads None of the above Hint 13). The dielectric materials increase the ________ Capacitance Resistivity Both a and b None of the above Hint 14). Capacitor obey _________ law Coulombs Ohms law Kirchhoffs law All of the above Hint 15). The relationship between frequency, capacitance, and capacitor reactance is given by _____ Capacitance reactance=1/2πfc Capacitance reactance=1/2πf Capacitance reactance=1/2fc Capacitance reactance=1/4πfc Hint 16). The capacitors categorized into _______ groups One Two Three Four Hint 17). Which one is a polarized capacitor? Electrolytic capacitor Ceramic capacitor Silver capacitor Teflon capacitor Hint 18). Which one is a non-polarized capacitor? Polystyrene capacitor Ceramic capacitor Teflon capacitor All of the above Hint 19). _________ are the dielectric materials Air or Vaccum Rubber, oil, paper Mica, glass, ceramic All of the above Hint 20). What is the standard unit of electric charge? Watts Henry Farads Coulombs Hint 21). To store the electric charge the ultra-capacitors uses ______ effect Single layer Double layer Both a and b None of the above Hint 22). The advantages of ultra-capacitors are _______ Long life Transient response is fast Efficiency is high All of the above Hint 23). The capacitance range of supercapacitors is from ________ 100 farad to 5000 farad 200 farad to 5000 farad 300 farad to 5000 farad 400 farad to 5000 farad Hint 24). The supercapacitors are also known as ________ Ultracapacitors Electrical double-layer capacitors Ultra or electrical double-layer capacitors None of the above Hint 25). The hybrid capacitors are categorized into ______ One Two Three Four Hint Capacitors MCQs for Students 26). The conducting polymers and metal oxides are ____________ capacitors Hybrid Double layer Pseudo None of the above Hint 27). The activated carbons, carbon nanotubes, carbon aerogels are _______ type of capacitors Hybrid Double layer Pseudo None of the above Hint 28).The disadvantages of supercapacitors are ________ Cost is high Have a high self-discharge rate Cannot be used in AC and high-frequency circuits All of the above Hint 29). Which one is a variable capacitor? Ceramic trimmer capacitor Air gap capacitor Vaccum capacitor All of the above Hint 30). Which one is a type of miscellaneous capacitor? Supercapacitors Air gap capacitors Hybrid capacitors All of the above Hint 31). The supercapacitors are categorized into __________ One Two Three Four Hint 32). Which one is a film-based capacitor? Metalized paper power capacitor Paper film/foil power capacitor PP film/foil power capacitor All of the above Hint 33). The minimum film thickness of polyester is ___ 0.1-0.9µm 0.2-0.9µm 0.4-0.9µm 0.7-0.9µm Hint 34). The minimum film thickness of polyethylene sulfide is ___ 0.1µm 0.2µm 1.2µm 0.7µm Hint 35). The minimum film thickness of polyethylene naphthalate is ___ 0.1-0.9µm 0.2-0.9µm 0.4-0.9µm 0.9-1.4µm Hint 36). The capacitance range of polyester is ____________ 100PF to 22µF 100PF to 2µF 100PF to 32µF 100PF to 42µF Hint 37). The capacitance range of polyethylene naphthalate is ____________ 100PF to 22µF 100PF to 1µF 100PF to 32µF 100PF to 42µF Hint 38). The capacitance range of polyethylene sulfide is ____________ 100PF to 22µF 100PF to 1µF 100PF to 0.47µF 100PF to 42µF Hint 39). The capacitance range of polypropylene is ____________ 100PF to 22µF 100PF to 10µF 100PF to 0.47µF 100PF to 42µF Hint 40). The dielectric strength of polyester is ________ 580V/µm 780V/µm 880V/µm 980V/µm Hint 41). The dielectric strength of polyethylene napthalate is ________ 500V/µm 780V/µm 880V/µm 980V/µm Hint 42). The dielectric strength of polyphenylene sulfide is ________ 470V/µm 780V/µm 880V/µm 980V/µm Hint 43). The dielectric strength of polypropylene is ________ 470V/µm 780V/µm 650V/µm 980V/µm Hint 44). The electrolytic capacitors are categorized into _______ families according to their dielectric One Two Three Four Hint 45). The ____________ capacitors are fixed capacitors Non-polarized Polarized Both a and b None of the above Hint 46). Niobium oxide capacitor is a type of ________ capacitor Solid electrolyte Polyester Pseudo None of the above Hint 47). Which capacitor do stores charge electrochemically? Double-layer capacitors Pseudo capacitors Hybrid capacitors All of the above Hint 48). The polyester capacitors are categorized into ________ types One Two Three Four Hint 49). The maximum capacitor value of super capacitor is ________ 5000F 10000F 1200F 12000F Hint 50). Which type of energy does the capacitor store? Kinetic Potential Both a and b None of the above Hint Capacitors MCQs for Interviews 51). After long time capacitor blocks ________ DC AC Both a and b None of the above Hint 52). The DC voltage range of polyester is _______ 10-50V 20-50V 50-100V 50-1000V Hint 53). The DC voltage range of polyethylene napthalate is _______ 10-50V 20-50V 50-100V 16-250V Hint 54). The DC voltage range of polypropylene is _______ 10-50V 16-100V 50-100V 50-1000V Hint 55). The DC voltage range of polyphenylene sulfideis _______ 40-2000V 16-250V 50-100V 50-1000V Hint 56). Which capacitor do stores charge electro statically? Double-layer capacitors Pseudo capacitors Hybrid capacitors All of the above Hint 57). ______ is a passive device Capacitor Transistor Both a and b None of the above Hint 58). The metals have _________ Low capacitance High capacitance High resistivity None of the above Hint 59). In transistor circuits _________ capacitors are used Ceramic Air Hybrid None of the above Hint 60). Which capacitor do stores charge electrochemically and electro-statically? Double-layer capacitors Pseudo capacitors Hybrid capacitors All of the above Hint 61). _________ capacitors are used for tuning, radiofrequency coupling, and audio frequency Mica Air Ceramic None of the above Hint 62). ___________ capacitors are used in communication transmitters Electrolyte Variable Air None of the above Hint 63). The value range of ceramic capacitors is from __________ Few picofarads to 0.1 microfarads Few picofarads to 3 microfarads Few picofarads to 10 microfarads None of the above Hint 64). The features of micro capacitors are _______ Low tolerance Very accurate Low resistive inductive losses All of the above Hint 65). The features of ceramic capacitors are ______ Low capacitance per unit volume Low loss factor Reasonable level of stability All of the above Hint 66). The features of paper capacitors are _________ Low capacitance High working voltage and current High leakage rates All of the above Hint 67). The features of thin-film capacitors ___________ High stability, low cost Low losses even at high frequencies Long shelf life All of the above Hint 68). The frequency of electrolytic capacitor are ________ Limited frequency response High capacitance and voltage ranges are available High leakage current and aging All of the above Hint 69). The tantalum _________ Allows large current to pass Reliable and stable over time Both a and b None of the above Hint 70). The charging time of super capacitors is _______ 1-2seconds 2-5seconds 1-8seconds 1-10seconds Hint 71). The service life of supercapacitors is _______ 1-2seconds 2-5seconds 10-15seconds 1-10seconds Hint 72). The capacitors used in _________ Energy storage systems Signal processing devices Filter applications All of the above Hint 73). Based on the dielectric materials the SMD capacitors categorized into ______ types One Two Three Four Hint 74). The advantages of SMD capacitors are __________ Small in size Less cost High performance All of the above Hint 75). The disadvantages of SMD capacitors are ________ Low heat capacity Due to its size the manual operation is difficult Both a and b None of the above Hint Capacitors MCQs for Exams 76). What is the standard form of SMD capacitor? Simple Multilayer Device Surface Multilayer Device Surface Mount Device None of the above Hint 77). The ceramic capacitors used in _________ Printed circuit boards Transmitter stations Power circuit breakers All of the above Hint 78). The polyester capacitors used in __________ DC applications Small size Most cost-effective All of the above Hint 79). The temperature coefficient of PET capacitor is _________ ±1.0% ±2.0% ±4.0% ±5.0% Hint 80). The temperature coefficient of X7R is _________ ±1.0% ±12.0% ±14.0% ±15.0% Hint 81). The dielectric absorption of PET capacitor is ________ ±1.0% ±12.0% 0.5% ±15.0% Hint 82). The dielectric strength of barium titanate is ___________ 2-10Kv/mm 4-10Kv/mm 6-10Kv/mm 8-10Kv/mm Hint 83). The dielectric strength of paper is ___________ 10Kv/mm 14Kv/mm 60Kv/mm 80Kv/mm Hint 84). The dielectric strength of glass is ___________ 10Kv/mm 15Kv/mm 60Kv/mm 80Kv/mm Hint 85). The dielectric strength of mica is ___________ 63Kv/mm 15Kv/mm 60Kv/mm 80Kv/mm Hint 86). 100 PF is equal to ________ 0.1nF 0.9nF 0.10nF 0.8nF Hint 87). 1000 PF is equal to ________ 1nF 0.9nF 0.10nF 0.8nF Hint 88). 100 nF is equal to ________ 1µF 0.1µF 0.10µF 0.8µF Hint 89). The relative permittivity is defined as the ratio of _____________ Electric flux density divided by electric field strength FalseElectric field strength divided by electric flux density Electric field strength divided by dielectric flux density None of the above Hint 90). The paper capacitors used in ______ applications High current High voltage Both a and b None of the above Hint 91). Which one is a type of film capacitor? Aluminum Tantalum Axial style None of the above Hint 92). The nominal capacitance range of niobium electrolyte capacitor is _______ 1uF to 1200uF 1uF to 100uF 1uF to 200uF 1uF to 1500uF Hint 93). The working voltage of niobium electrolytic capacitor is from _________ 1V to 10V 10V to 16V 1V to 19V 1V to 20V Hint 94). The disadvantage of the niobium electrolytic capacitor is _____________ Low voltage rating High operating losses Both a and b None of the above Hint 95). The advantage of niobium electrolytic capacitor is _____________ Low cost Reliable High volumetric capacitance All of the above Hint 96). The nominal capacitance of tantalum electrolytic capacitor is from _______ 0.1uF to 1000uF 0.9uF to 1000uF 0.7uF to 1000uF 0.8uF to 1000uF Hint 97). The working voltage of tantalum electrolytic capacitor is from _______ 3V to 100V 2V to 100V 6V to 100V 1V to 100V Hint 98). Typical tolerance of tantalum electrolytic capacitor is _______ 5% 10% 18% 20% Hint 99). The nominal capacitance of an aluminum electrolytic capacitor is from _______ 0.1uF to 47000uF 0.9uF to 1000uF 0.7uF to 1000uF 0.8uF to 1000uF Hint 100). What is the standard form of EDLC? Electrode Double Layer Capacitor Electric Double Layer Capacitor Electric/electrochemical Double Layer Capacitor None of the above Hint Capacitors MCQs for Quiz 101). The electric/electrochemical double-layer capacitor works on _______ layer capacitance principle Single Double Both a and b None of the above Hint 102). The electrolyte is used as a ______ in electrolyte capacitors Conductor Insulator Isolator None of the above Hint 103). The coulombic efficiency of the capacitor is about _______ 10% 20% 50% 100% Hint 104). The coulombic efficiency of the super capacitor is _______ 10% 20% 50% 99% Hint 105). The coulombic efficiency of the battery is about _______ 10% 20% 70-80% 99% Hint 106). The charge storage determinants of the capacitor is _______ Electrode area and dielectric Microstructure of electrode and electrolyte Thermodynamics and active mass None of the above Hint 107). The charge storage determinants of the super capacitor are _______ Electrode area and dielectric Microstructure of electrode and electrolyte Thermodynamics and active mass None of the above Hint 108). The charge storage determinants of battery is _______ Electrode area and dielectric Microstructure of electrode and electrolyte Thermodynamics and active mass None of the above Hint 109). The discharge time of the battery is ________ 0.1 to 1hr 0.1 to 5hr 0.03 to 3hr 0.09 to 1hr Hint 110). The charge time of the battery is ________ 0.1 to 1hr 1 to 5hr 0.03 to 3hr 0.09 to 1hr Hint 111). What is the standard form of GCD? Galvanostatic Charge/Discharge Galvanostatic Capacitor Discharge Galvanostatic Discharge None of the above Hint 112). The charge time of lithium-ion is _________ 10-20minutes 10-40minutes 10-50minutes 10-60minutes Hint 113). The cell voltage of lithium-ion is _________ 2 to 5V 2 to 9V 3.6 to 3.7V 2 to 15V Hint 114). The cell voltage of super capacitor is _________ 2 to 5V 2.3 to 2.7V 3.6 to 3.7V 2 to 15V Hint 115). The service life of lithium-ion is ______ 5 years 10 years 15years 5-10years Hint 116). The advantages of polystyrene capacitor is _________ Low leakage Low distortion High insulation All of the above Hint 117). The disadvantages of polystyrene capacitor is _________ Not heat resistance Good temperature stability Low dielectric absorption All of the above Hint 118). The dielectric constant value of polystyrene capacitors is _______ 1-2 2.5-2.6 3-4 4-5 Hint 119). The dielectric constant value of mica capacitors is _______ 1-2 6 3-4 4-5 Hint 120). The mica capacitors categorized into _________ types One Two Three Four Hint 121). The mica capacitors used in __________ Radio or TV transmitters Coupling circuits Resonant circuits All of the above Hint 122). The properties of mica capacitor are __________ High accuracy High Q Temperature coefficient All of the above Hint 123). Which one is used as a dielectric in silver mica capacitor? Silver Mica Both a and b None of the above Hint 124). The characteristics of mica capacitors are ________ Low losses Stability Accuracy and tolerance All of the above Hint 125). The capacitors _______ Stops DC Allows AC to pass Stores voltage in the form of the dielectric field All of the above Hint Capacitors MCQs for Engineers 126). The function of capacitor in a circuit is _______ Prevent the loss of information AC/DC conversion, reactive power control Electric charge storage All of the above Hint 127). The advantages of ceramic capacitor is _______ Available in both SMD and lead packages Frequency performance is high Cheap to manufacture All of the above Hint 128). In transistor circuits _______ capacitor is used Mica Paper Ceramic None of the above Hint Read more about Transistors 129). The dielectric material in air gap trimmer capacitors is _____ SF6 Air Mica None of the above Hint 130). The dielectric material in SF6 gas-filled tunning capacitors is _____ SF6 Air Mica None of the above Hint 131). The dielectric material in glass capacitors is _____ SF6 Air Glass None of the above Hint Read more about Dielectric Materials 132). The wet tantalum capacitors used in _______ Space Avionics Consumer applications All of the above Hint 133). Which one is used as dielectric in tantalum capacitors? Niobium pentoxide Manganese dioxide Tantalum pentoxide All of the above Hint 134). In a capacitor, the relation between voltage and current is ______ I=C dv/dt I=2C dv/dt C=I dv/dt None of the above Hint 135). The capacitor act as short circuit for _________ Low frequencies High frequencies Both a and b None of the above Hint Read more about Capacitors 136). The capacitor act as an open circuit for _________ Low frequencies High frequencies Both a and b None of the above Hint 137). The capacitors ____________ in an exponential manner Discharge and charge Only charge Only discharge None of the above Hint 138). The dielectric constant of air is ________ Unity One Zero Infinity Hint 139). When capacitors connected in series ______ remains same and _______ varies Charge, voltage Voltage, charge Capacitance, reactance None of the above Hint 140). For _____________ charge the gauss law is applicable Sheet charge Point charge Line charge All of the above Hint 141). The flux density increases when charge _____ Increases Decreases Constant Varies Hint 143). The ratio of actual to absolute permittivity is known as a _______ permittivity Relative Actual Absolute None of the above Hint 144). When actual permittivity decreases the relative permittivity __________ Decreases Increases Constant None of the above Hint 145). If relative permittivity increases the absolute permittivity __________ Remains the same Increases Decreases None of the above Hint 146). There is no unit for the ____________ permittivity Absolute Relative Actual None of the above Hint 147). While the capacitor is charging the final current of a capacitor is ________ One Zero Infinity None of the above Hint 148). While the capacitor is charging the initial current of a capacitor is very high True False Hint 149). The capacitor acts as an ______ circuit at DC Only open Only close Both open and close None of the above Hint 150). The aluminum electrolyte capacitors are not suitable for ________ Coupling Decoupling Attenuation All of the above Hint Time is Up! Time's up
