Capacitor Question & Answers January 17, 2023 By Wat Electrical This article lists 100 Capacitor MCQs for engineering students. All the Capacitor Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Capacitor. Electrical energy is stored in the form of electric fields in a device called Capacitor. It is a two-terminal device and a passive component. Capacitance is the term used in capacitors that determines the effect of the capacitor. Originally it is referred to as a Condenser. Two conductors are arranged in closed proximity and are insulated from one another in capacitors. For example, Parallel-plate capacitors are considered simple devices of storage. If one side of the plate has a total positive number of charges i.e., + Q, and the other side has charges i.e., -Q then the device capacitor contains charge as Q. Capacitors are utilized in various prominent applications. For example, in the digital circuitry, the information in the large memories of the computer is stored and cannot be lost due to momentary failure in electricity. The capacitors have electric energies that can maintain the info during power losses temporarily. Distinct capacitors are available i.e., from small beads of capacitor utilized in resonators to the large capacitors for correcting power factors but the purpose of these capacitors remains the same i.e., for charge storage. The capacitor resembles like small battery i.e., rechargeable. 1). What stores the electrical energies? Capacitor Inductor Resistor Transformer Hint 2). What is the energy type stored in a capacitor? Heat Energy Potential Energy Kinetic Energy Vibrational Energy Hint Read More about Capacitor 3). Which belongs to the passive category of devices? Rectifier Transformer Transistor Capacitor Hint 4). What blocks dc signals at steady states? Capacitor Inductor Resistor Transformer Hint 5). What are the SI units of a capacitor? Farads Weber Tesla None Hint 6). What is the layer of insulation amid the plates of the capacitor? Conductive Propagation Dielectric Semiconductive Hint 7). Plates in the capacitor are ____________? Conductive Non-conductive Dielectric Semiconductive Hint 8). Dielectric that increases capacitances in a capacitor when compared with air is referred to as _____________? Conductivity Constant Dielectric Constant Insulating Constant Semi-conductivity Constant Hint 9). For insulators dielectric constant will be _______? High Low Moderate None Hint 10). What are the units of the Dielectric constant? Farad Weber Tesla None Hint 11). What is blocked at the steady state of the capacitor? Direct Current Alternating Current a & b None Hint 12). Electrical energy stored inside the capacitor is referred to as ___________? Inductance Capacitance Resistance Impedance Hint 13). What are the units of capacitance? Farad Weber Tesla Ohms Hint 14). Amount of the electricity stored in capacitors if increased indicates ____________? Increase in Capacitance Decrease in Capacitance Increase in Resistance Increase in Inductance Hint 15). What is the equation of capacitance in a Parallel-plate capacitor? ɛ(A/d) A / d ɛ A ɛ d/ A Hint 16). Two conduction plates of metal i.e., 20 cm*40 cm are separated by a 4 mm distance and the dielectric is amid them is air. Find the capacitance. 0.155nF 0.166nF 0.177nF 0.188nF Hint 17). What is affected due to the type of dielectric material utilized in the capacitor? Inductance Capacitance Resistance Impedance Hint 18). Dielectric constant is a factor that is related to _________? Dielectric Material Capacitance Insulator All Mentioned Above Hint 19). What is the equation of capacitance if the permittivity is complex? ɛo ɛr (A/d) ɛr A / d ɛo A ɛ d/ A Hint 20). What is the capacitance equation based on the n plates used? ɛo ɛr (A(n-1)/d) ɛr (An) / d ɛo A ɛ (nd)/ A Hint 21). What is the capacitance equation with interleaved 9 plates? ɛo ɛr (A8/d) ɛr (A9) / d ɛo A8 ɛ (nd)/ A Hint 22). Surface area of the capacitor is largely making the capacitance _________? Increase Decrease Remain the Same Zero Hint 23). How does distance amid plates affect capacitance? Smaller Distance Smaller Capacitance Smaller Distance Larger Capacitance Larger Distance Larger Capacitance Can’t Say Hint 24). If the dielectric used in the capacitor has high levels of permittivity what happens to capacitance? Increase Decrease Remain the Same Zero Hint 25). Mechanical support amid the plates of a capacitor is provided via ____________? Conductive Non-conductive Dielectric Semiconductive Hint Capacitor MCQs for Students 26). What gets increased due to the dielectric used in the capacitor? Capacitance Maximum Operating Voltage Resistance a & b Hint 27). Ratio of electric charges Q to its voltage V is referred to as __________? Inductance Capacitance Resistance Impedance Hint 28). What are the capacitors classified based on the structure? Trimmer Capacitors Variable Capacitors Fixed Capacitors All Mentioned Above Hint 29). What are the parts involved in a capacitor? Two Metal Plates Insulating Material a & b Conducting Material Hint 30). What are the types of capacitors based on polarization? Polarized Capacitors Unpolarized Capacitors a & b Fixed Capacitors Hint 31). Which are referred to as Electrolytic capacitors? Polarized Capacitors Unpolarized Capacitors a & b Fixed Capacitors Hint 32). Which capacitors are utilized for achieving higher levels of capacitive densities? Polarized Capacitors Unpolarized Capacitors a & b Fixed Capacitors Hint 33). Pure circuits of Ac use _________________? Polarized Capacitors Unpolarized Capacitors a & b Fixed Capacitors Hint 34). Which capacitors have high frequencies? Polarized Capacitors Unpolarized Capacitors a & b Fixed Capacitors Hint 35). Fixed capacitors contain the capacitance ___________? Varying Fixed Changing Dynamic Hint 36). __________ are utilized in any direction in circuits? Film Capacitors Ceramic Capacitors Electrolytic Capacitors Tantalum Capacitors Hint 37). Which capacitor values are varied based on varying it either mechanically or electrically? Fixed Capacitors Variable Capacitors Polarized Capacitors Non-Polarized Capacitors Hint 38). Interwoven set of metal plates in variable type capacitors have __________? Both Plates are Fixed One Plate is Fixed One Plate is Varying b & c Hint 39). Tuning capacitor is a __________? Fixed Capacitors Variable Capacitors Polarized Capacitors Non-Polarized Capacitors Hint 40). When the rotor of a tuning capacitor sits in the stator slot completely what happens to capacitance? Increase Decrease Remain the Same Zero Hint 41). Ganged Tuning capacitors contain ___________ capacitors? Zero One Two None Hint 42). What capacitors can be varied with the screwdrivers? Fixed Capacitors Tuning Capacitors Polarized Capacitors Trimmer Capacitors Hint 43). How many leads does a trimmer-type capacitor consist of? Four Three Two One Hint 44). What happens to the capacitance in the Trimmer capacitor if the area in the opposite gets larger? Increase Decrease Remain the Same Zero Hint 45). Fixed capacitors with ceramic as a dielectric are __________? Ceramic Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 46). What are the various classes of Ceramic capacitors? Class 3 Class 2 Class 1 All Mentioned Above Hint 47). What is known as Disc Capacitors? Ceramic Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 48). Which class of ceramic capacitors is utilized in resonant applications? Class 3 Class 2 Class 1 All Mentioned Above Hint 49). Which class of Ceramic capacitors offers higher efficiency? Class 3 Class 2 Class 1 All Mentioned Above Hint 50). Accuracy and factor of dissipation are lower in __________ ceramic capacitors? Class 3 Class 2 Class 1 All Mentioned Above Hint Capacitor MCQs for Exams 51). Which capacitor have dielectric as the film? Ceramic Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 52). High current and voltage applications use which film capacitors? Ceramic Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 53). What improves the factor regards to power in the device? Ceramic Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 54). Polypropylene is the film used in ___________? Ceramic Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 55). Which capacitor has an anode of metal coated with a layer oxidized? Film Capacitors Ceramic Capacitors Electrolytic Capacitors Tantalum Capacitors Hint 56). What is dielectric in Aluminium based Electrolytic capacitors? Tantalum Pentoxide Aluminum Pentoxide Niobium Pentoxide Molybdenum Pentoxide Hint 57). What are the various applications of paper capacitors? Used in Filtering of Noise Coupling Systems Decoupling Systems All Mentioned Above Hint 58). Which capacitors are placed in the car audio system? Paper Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 59). Film capacitors are _________? Polarized Non-polarized Have Polarity a & c Hint 60). What is the dielectric in Tantalum Electrolytic Capacitors? Tantalum Pentoxide Aluminum Pentoxide Niobium Pentoxide Molybdenum Pentoxide Hint 61). How is the capacitance of the capacitor measured? Digital Multi-meter Colour Codes Digital Voltmeter a & b Hint 62). What does the color band on the capacitor painted indicate? Capacitive Tolerance Capacitance Value Type of Capacitor a & b Hint 63). What represents capacitance in the capacitor with four bands of color? First Digit Second Digit Third Digit a & b Hint 64). Start capacitors are available in ____ color? Black White Grey Brown Hint 65). Start and Run are the capacitors of ___________? Punch Capacitor Push Capacitor Motor Capacitor Paper Capacitors Hint 66). Two electric motors are supported by ____________? Start Capacitors Stop Capacitors Run Capacitors Dual Run Capacitors Hint 67). ___________ are polypropylene based Film Capacitors? Start Capacitors Stop Capacitors Run Capacitors Dual Run Capacitors Hint 68). What are the terminals of Dual run capacitors? FAN HERM Common All Mentioned Above Hint 69). Why capacitors are failed? Capacitance Drift Temperature Instability Low Insulation Resistance All Mentioned Above Hint 70). Device operated below or at the maximum condition rated leads to ________? Dielectric Breakdown Temperature Instability Low Insulation Resistance High Dissipation Factor Hint 71). What leads to open capacitors? Dielectric Breakdown Temperature Instability Low Insulation Resistance Overstress Hint 72). Insulation resistance is ____________ if the temperature at capacitors is increased ? Increase Decrease Remain the Same Zero Hint 73). What is used to lower the fluctuations in distinct devices of filtering? Fixed Capacitors Tuning Capacitors Polarized Capacitors Trimmer Capacitors Hint 74). Dielectric strength is ________ with an increase in temperature at the capacitor? Increase Decrease Remain the Same Zero Hint 75). High transients in voltage cause premature failures in ____________? Capacitor Inductor Resistor Transformer Hint Capacitor MCQs for Interviews 76). Feedback circuits use ______________? Fixed Capacitors Variable Capacitors Polarized Capacitors Non-Polarized Capacitors Hint 77). Fan capacitors are ____________? Positive Polarity Negative Polarity Polarized Non-polarized Hint 78). What enhances the current supply? Start Capacitors Stop Capacitors Run Capacitors Dual Run Capacitors Hint 79). What analyses the capacitor's quality? Digital Multi-meter Colour Codes Digital Voltmeter Digital Ammeter Hint 80). What capacitors can be utilized for larger capacitance requirements? Film Capacitors Ceramic Capacitors Electrolytic Capacitors Tantalum Capacitors Hint 81). Motor capacitors are ______________? Polarized Non-polarized Have Polarity Positive Polarity Hint 82). Ceramic capacitors are suitable for __________ applications? High-Frequency Low Frequency Intermediate Frequency a & b Hint 83). Capacitors are used for _____________? Dc Ac a & b None Hint 84). Which capacitors are used in Flash lamps? Fixed Capacitors Tuning Capacitors Polarized Capacitors Trimmer Capacitors Hint 85). Air conditioners are driven by using ______________? Punch Capacitor Push Capacitor Motor Capacitor Paper Capacitors Hint 86). Humidity sensors use __________? Fixed Capacitors Tuning Capacitors Variable Capacitors Trimmer Capacitors Hint 87). Electrical noise in the audio-based amplifiers use __________? Film Capacitors Ceramic Capacitors Electrolytic Capacitors Tantalum Capacitors Hint 88). Larger capacitance required use ___________? Film Capacitors Ceramic Capacitors Electrolytic Capacitors Tantalum Capacitors Hint 89). Which are utilized as Safety Capacitors? Ceramic Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 90). Audio circuitry frequency responses are adjusted using ___________? Capacitor Inductor Resistor Transformer Hint 91). What are the capacitor's common uses? Energy Storage Power Conditioning Remote Sensing All Mentioned Above Hint 92). LC circuits of the receivers in radio contain ___________? Fixed Capacitors Variable Capacitors Polarized Capacitors Non-Polarized Capacitors Hint 93). Calibration equipment’s use _________? Fixed Capacitors Tuning Capacitors Polarized Capacitors Trimmer Capacitors Hint 94). What capacitors can reduce RF noises? Ceramic Capacitors Film Capacitors Trimmer Capacitors Tuned Capacitors Hint 95). What removes the spikes that are unwanted from the signals? Capacitor Inductor Resistor Transformer Hint 96). When capacitors are using a DC supply it has __________ impedance? Zero Infinite Finite None Hint 97). Excess amounts of current or heat can increase the deterioration of __________? Capacitor Inductor Resistor Transformer Hint 98). Camera flash is the example for ____________? Capacitor Inductor Resistor Transformer Hint 99). What is utilized for power supply outcome? Capacitor Inductor Resistor Transformer Hint 100). What is utilized to block DC? Capacitor Inductor Resistor None Hint For More MCQs Electrical Inductors Question & Answers Resistors Question & Answers Time's up
