Rectifier Question & Answers January 28, 2023 By Wat Electrical This article lists 100 Rectifier MCQs for engineering students. All the Rectifier 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 Rectifier. Electronic circuits to perform operations require DC voltages. The conversion of voltages from AC to DC is possible by placing a diode with a PN junction. The most prominent function of a diode is to rectify the Ac into Dc and the process is referred to as Rectification. The electric current in diodes moves in a single direction i.e., when it is forward biased and the current during reverse mode will be blocked. It is the property that allows the diode to behave as Rectifier. These devices can shape like Mercury-arc valves, Solid-state diodes, and so on. Mainly these rectifiers are categorized as Uncontrolled and Controlled Rectifiers. If the applied voltages are not be able to control are referred to as Uncontrolled rectifiers. If the voltage applied is controlled it is referred to as a Controlled rectifier. Further, these rectifiers are classified based on cycles used for conversion and are referred to as Half and Full Wave rectifiers. The half cycle of AC is converted into DC in Half Wave rectifier whereas the full cycle i.e., both positive and the negative halves of the cycle are converted to DC in Full Wave Rectifiers. SCRs, IGBTs, and the MOSFETs are utilized for converting uncontrolled to controlled rectifiers. The wheat stone bridge is the perfect example of full wave rectification. 1). Which voltage is preferred for operating an electronic circuit? DC AC Cut-off Threshold Hint 2). How is the voltage converted from AC to DC? Resistor Capacitor Inductor Diode Hint Read More about Rectifier 3). The current flow is __________ in diodes? Uni-directional Bi-directional Multi-directional a & b Hint 4). Which device acts as Rectifier? Resistor Capacitor Inductor Diode Hint 5). What is the process of converting AC to DC? Synchronization Simplification Rectification Recursion Hint 6). In how many categories rectifiers are classified? Four Three Two One Hint 7). Rectifier with uncontrollable voltage is referred to as __________? Half Wave Rectifier Full Wave Rectifier Uncontrolled Rectifier Controlled Rectifier Hint 8). What converts the rectifiers uncontrolled into controlled ones? SCRs MOSFETs IGBTs All Mentioned Above Hint 9). Why are diodes with PN junction utilized as Rectifiers? Symmetric Voltage/Current Characteristics Asymmetric Voltage/Current Characteristics Asymmetric PN Junction Symmetric PN Junction Hint 10). Based on cycles used rectifiers are classified as_____________? Half Wave Rectifier Full Wave Rectifier Negative Rectifier a & b Hint 11). What are the factors responsible for the classification of Rectifiers? Type of Configuration Components Used Cycles Applied All Mentioned Above Hint 12). How many diodes are used in Half Wave Rectifiers? Four Three Two One Hint 13). What are the major components of Half wave rectifiers? Diode Transformer Resistive Load All Mentioned Above Hint 14). Only for the positive cycle the diode is conducted in __________? Half Wave Rectifiers Full Wave Rectifiers Bridge Rectifiers Center-tapped Rectifier Hint 15). For the negative applied cycle in half wave rectifier the circuit _________? Conducts Does Not Conduct May or May Not Conduct Remains Stable Hint 16). __________produce outcome as DC in pulsating form? Half Wave Rectifiers Full Wave Rectifiers Bridge Rectifiers Center-tapped Rectifiers Hint 17). What converts pulsating to constant waveforms of DC in Half wave rectifiers? Load Transformer Filter Diode Hint 18). What can be used as a filter in Half wave Rectifiers? Resistors Capacitors Inductors a or b Hint 19). What happens if the load is resistive in Half wave rectifiers? Voltage on Load Proportional to Current Voltage on Load is not Proportional to Current Voltage and Current are Indirectly Proportional Voltage and Resistance are Indirectly Proportional Hint 20). Which rectifiers convert both cycles of AC to DC? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifiers Hint 21). What are the various types of Full wave rectifiers? Half Wave Rectifiers Bridge Rectifiers Center-tapped Rectifier b & c Hint 22). How many diodes are utilized in Bridge Rectifiers? Four Three Two One Hint 23). Polarity across the resistor at load in bridge rectifiers is __________? Different Same Changes Fluctuates with Applied Input Hint 24). Ripples are low in _________? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifiers Hint 25). How many diodes conduct for one cycle of AC in the Bridge Rectifier? Four Three Two One Hint Rectifier MCQs for Exams 26). Rectifier efficiency is improved in _____________? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifier Hint 27). Bridge rectifier is complex compared to ____________? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifier Hint 28). How many inputs does a center-tap transformer contain? Four Three Two One Hint 29). Which terminals are referred to as the ground in center-tapped transformers? Fourth Third Second First Hint 30). Terminal 1 in the center-tapped transformer produces __________? Reference Voltage Positive Voltage Negative Voltage Zero Voltage Hint 31). What removes ripples from the outcome of center-tapped Full wave rectifiers? Resistor Diode Capacitor Transistor Hint 32). How many diodes does a single-phase Bridge Rectifier consists of? Four Three Two One Hint 33). How many diodes do a Three-phase Bridge Rectifier consist of? Four Five Six Seven Hint 34). How many diodes are required in a Full wave Center-tapped transformer? Four Three Two One Hint 35). Transformer is not required in ___________? Half Wave Rectifier Full Wave Center-tapped Rectifier Bridge Rectifier a & c Hint 36). Ratio of the power output of DC to the applied input power of AC is __________? Ripple Factor Efficiency Transformer Utilization Ratio Distortion Hint 37). How well the voltage of AC converted to DC is determined? Ripple Factor Efficiency Transformer Utilization Ratio Distortion Hint 38). Ripple frequency of bridge rectifiers based on the applied frequency at the input is ___________? Same as Input Frequency 2 (Input Frequency) 3 (Input Frequency) 4 (Input Frequency) Hint 39). Ripple frequency of half-wave rectifiers is ___________? Same as Input Frequency 2 (Input Frequency) 3 (Input Frequency) 4 (Input Frequency) Hint 40). What is the Half wave rectifier's efficiency if the power at the output is 50 Watts and the power at the rectifier input is 100 Watts? 100 % 75 % 50 % 25 % Hint 41). What is the rectifier’s efficiency of half wave? 40 % 40.6 % 81 % 81.6 % Hint 42). Ripple factor value of Half wave rectifier is _______? 1 1.21 1.5 Infinite Hint 43). What are the load currents of the half-wave rectifier's RMS value? Im Im/2 Im/4 2Im Hint 44). What is the efficiency of Full wave rectifiers? 40 % 40.6 % 81 % 81.6 % Hint 45). What is the formula to calculate the Form factor of the rectifier? Ratio of RMS to Average Values Ratio of Average to RMS values Ratio of RMS to DC Power Ratio of DC power to AC Power Hint 46). Outcome with many ripples is obtained in __________? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 47). What is the downside of Half wave rectifier? Power Gain Power Loss Low Output Voltage b & c Hint 48). What is the average voltage of DC in Half wave rectifiers? Vm Vm/π 2 Vm 2Vm/ π Hint 49). What is the formula to calculate rectifiers' Form factor? sqrt( (Vrms/Vdc)^2-1) (Vrms/Vdc)^2-1 (Vrms/Vdc)^2 (Vrms/Vdc) Hint 50). If the load has a DC of 1 Amp. What is the current carried by diodes in the Full wave circuit of the Rectifier? 0 Amps 0.5 Amps 1 Amps 1.5 Amps Hint Rectifier MCQs for Students 51). What is the Ripple factor of a Full wave rectifier? 0.482 1.21 1.5 Infinite Hint 52). What is the ripple factor for half-wave rectifiers with three phases? 0.17 1.21 1.5 Infinite Hint 53). What indicates the power supply outcome purity? Ripple Factor Efficiency Transformer Utilization Ratio Distortion Hint 54). What is the Form factor of a Full wave rectifier? 1.2 1.11 1.57 1.66 Hint 55). If 230v, 50 Hz is applied to the Full wave circuit. What is the frequency of the output? 60 Hz 100 Hz 120 Hz 200 Hz Hint 56). A symmetrical wave of square rectified by a half-wave of 2 Amps current. What is its RMS value? 1 Amps 2 Amps sqrt(2) Amps 0 Hint 57). How many diodes are present in the Three phases of half-wave rectification circuits? Four Three Two One Hint 58). What is the period of conduction possessed by each diode in Half wave rectifier of three phases? 0 90 120 270 Hint 59). Ripple frequency is three times of ____________ in Half wave three phase rectifiers? Input Frequency Output Frequency Diode Frequency Transformer Frequency Hint 60). What is the maximum voltage can a device withstand known as? Input Voltage Peak Voltage Peak Inverse Voltage Output Voltage Hint 61). PIV must be higher than its maximum _________ supplied? Current Voltage Frequency Temperature Hint 62). PIV of Full wave rectifier is ________ than Half-wave rectifier? Equal Same Double Triple Hint 63). What is double the voltage of the transformer's secondary terminals?device withstand known as? Input Voltage Peak Voltage Peak Inverse Voltage Output Voltage Hint 64). Which rectifier has better regulation of voltage? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 65). How ripples are reduced in the rectifier circuits? Higher Capacitance High Input Frequency High Load Resistance All Mentioned Above Hint 66). What type of capacitor is preferred in rectifiers? Paper Capacitors Aluminum Electrolytic Capacitors Gallium Capacitors Mica Capacitors Hint 67). Half-wave precision rectifiers are implemented by using ________? Diodes Transistors Op-amps Processors Hint 68). Which is the most common rectifier used in electronics? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 69). Larger filters are required for smoothening of outcome in __________? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 70). What is the output content of ripple in the Half-wave three-phase circuit of rectification? Input Frequency Two Times of Input Frequency Three Times of Input Frequency None Hint 71). Three-phase half-wave rectifiers require ___________? Two-wire Input Supply Three-wire Input Supply Four-wire Input Supply Six-wire Input Supply Hint 72). Which rectifier has a lesser ripple voltage? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifier Hint 73). Three-phase rectifiers suffer higher __________? Harmonic Distortion Ripple Factor AC Components at Output Cost Filtering Hint 74). Three-phase rectifier circuit use __________? Resistor Capacitor Diode Thyristors Hint 75). Where do we use the three-phase rectification circuits? Domestic Equipment Industrial Applications High-Power Applications b & c Hint Rectifier MCQs for Interviews 76). Single-phase rectifiers are used in ___________? Domestic Equipment Industrial Applications High-Power Applications b & c Hint 77). The amplitude of output will be lesser than the amplitude of input in __________? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 78). Transformer Utilization factor will be high for ________? Half Wave Rectifiers Positive Cycle Rectifiers Full Wave Rectifiers a & b Hint 79). Ripple factor in Full wave circuit of rectification is reduced by ____________? Resistor Capacitor Diode Transistor Hint 80). Which rectifier is much costlier? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifiers Hint 81). The outcome with high power and voltages is obtained in ___________? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifiers Hint 82). Which rectifier circuit needs more elements in the circuit? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifiers Hint 83). Full wave rectifier's efficiency of rectification will be __________ than Half wave rectifiers? Equal Same Double Triple Hint 84). Ripple factor will be lower in ___________? Half Wave Rectifiers Full Wave Rectifiers Positive Cycle Rectifiers Negative Cycle Rectifiers Hint 85). Which rectifier is placed in UPS? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 86). Low power application prefers __________? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 87). A synchronized __________ is utilized in Electric locomotives? Resonator Rectifier Resistor Capacitor Hint 88). In power supply units _________ is placed serially with the transformer? Resonator Rectifier Resistor Capacitor Hint 89). Three-phase traction motor of running train use ____________? Resonator Rectifier Transformer Capacitor Hint 90). What is used in AM Radios for detection purposes? Resonator Rectifier Transformer Capacitor Hint 91). Transformers combined with ___________for generating appropriate voltages of DC? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 92). Firing circuits use ____________? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 93). Chargers used for mobile phones consists of _________? Resonator Rectifier Transformer Capacitor Hint 94). Which rectifier is placed in the power supply circuit? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 95). Circuits requiring Soldering iron use __________? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 96). Voltage multipliers are made of ______________? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 97). Shunt capacitors are utilized in ________? Resonator Rectifier Transformer Capacitor Hint 98). What are the various applications of Rectifiers? Modulation Demodulation Voltage Multipliers All Mentioned Above Hint 99). What is used in mosquito repellents? Half Wave Rectifier Center-Tapped Rectifier Bridge Rectifier Transformer Hint 100). Polarized voltages can be provided using ____________ during wielding? Resonator Rectifier Transformer Capacitor Hint For More MCQs Silicon Controlled Rectifier Question & Answers Time's up