Voltage Regulators Question & AnswersJune 5, 2021 By WatElectronics This article lists 100 Voltage Regulator MCQs for engineering students. All the Voltage Regulator Questions & Answers given below includes solution and link wherever possible to the relevant topic.A voltage regulator is a combination of elements designed to ensure that the output voltage of a supply remains constant. The technical block diagram of any power supply consists of a rectifier, filter, and regulator. First of all the input voltage is scaled down using the step-down transformer and then that voltage converted into pulsating dc using a rectifier and the variation in pulsating dc is filtered out using the filter circuit and if you see the output of the filter circuit then that output still contains some amount of ripple, so the filtered output is then given to the regulator to remove the variations and provide the constant output.The line and load regulation are these two important parameters of the power supply, and these two parameters define how well the power supply can provide the constant output voltage even if there is a change in the line or load voltage. 1). When load varies __________ voltage regulation maintains constant output voltage Line Load Both a and b None of the above HintWhen load varies load voltage regulation maintains the constant output voltage2). When input voltage varies __________ voltage regulation maintains the constant output voltage Line Load Both a and b None of the above HintWhen input voltage varies line voltage regulation maintains the constant output voltage3). ___________ are the type of linear voltage regulators Series Shunt Both a and b None of the above HintBoth series and shunt are the types of linear voltage regulators4). ___________ is an example of fixed positive voltage regulator IC7805 IC7905 IC7906 None of the above HintAn IC7805 is an example of the fixed positive voltage regulator5). ___________ is an example for fixed negative voltage regulator IC7805 IC7905 IC7906 None of the above HintAn IC7905 is an example of the fixed negative voltage regulator6). ___________ is an example for positive adjustable voltage regulator IC7805 IC7905 IC7906 LM317 HintLM317 is an example of a positive adjustable voltage regulator7). The maximum input voltage of the LM78MXX IC range is _________ 35V 40V 45V 50V HintThe maximum input voltage of the LM78MXX IC range is 35V8). The maximum current of LM78MXX IC range is _________ 100mA 500mA 1mA 200mA HintThe maximum current of LM78MXX IC range is 500mA9). Which one is a type of linear voltage regulator? Series Step-down Inverter All of the above HintThe series voltage regulator is a type of linear voltage regulator10). How many types of voltage regulators are there? One Two Three Four HintThere are two types of voltage regulators are there they are linear and switching voltage 11). The fixed positive voltage regulators provides voltage in the range of _________ +3 to +24V -3 to -24V +5 to +24V -5 to -24V HintThe fixed positive voltage regulators provide voltage in the range of +5 to +24V12). The fixed negative voltage regulators provides voltage in the range of _________ +3 to +24V -3 to -24V +5 to +24V -5 to -24V Hint The fixed negative voltage regulators provide voltage in the range of -5 to -24V13). The maximum current of LM78LXX IC range is _________ 100mA 500mA 1mA 200mA HintThe maximum current of the LM78LXX IC range is 100mA14). Which one is a type of switching voltage regulator? Step-up Step-down Inverter All of the above HintThe step-up, step-down, and inverter are the switching type voltage regulators Read more about Voltage Inverters15). The maximum current of LM78XX IC range is _________ 100mA 500mA 1mA 200mA HintThe maximum current of the LM78LXX IC range is 1mA16). The maximum input voltage of the LM78LXX IC range is _________ 35V 40V 45V 50V Hint The maximum input voltage of the LM78LXX IC range is 35V17). ___________ is an example for negative adjustable voltage regulator IC7805 IC7905 LM337 LM317 HintLM337is an example of the negative adjustable voltage regulator18). The maximum input voltage of the LM78XX IC is _______ 35V or 40V 42V 45V 50V HintThe maximum input voltage of the LM78XX IC is 35V or 40V19). The input voltage range of an IC 7805 voltage regulator is _______ 5V-12V 7V-35V 6V-12V None of the above HintThe input voltage range of an IC 7805 voltage regulator is 7V-35V20). In which type of regulator does 7805 IC is used? Fixed output voltage regulator Current regulator Adjustable output regulator All of the above Hint An IC 7805 used in all fixed output voltage regulator, current regulator, and adjustable output regulatorVoltage Regulator Important MC's With Hints21). Which IC is a fixed positive voltage regulator? LM78XX LM79XX LM2576 LM2596 HintIC LM78XX is a fixed positive voltage regulator22). Which IC is a fixed negative voltage regulator? LM78XX LM79XX LM2576 LM2596 HintIC LM79XX is a fixed negative voltage regulator23). Which IC is a fixed and adjustable switching voltage regulator? LM78XX LM2596 LM2576 Both b and c HintBoth LM2596 and LM2576 are fixed and adjustable switching voltage regulator24). Which IC is a low power variable voltage regulator? LM78XX LM723 LM2576 Both b and c Hint An IC LM723 is a low power variable voltage regulator25). The maximum output voltage range of an IC 7805 voltage regulator is _______ 5.2V 7.5V 6.2V None of the above HintThe maximum output voltage range of an IC 7805 voltage regulator is 5.2V26). Which IC is an adjustable negative voltage regulator? LM333 LM237 LM337 All of the above HintAn IC’s LM333, LM237, and LM337 are adjustable negative voltage regulators27). Which IC is an adjustable positive voltage regulator? LM150 LM350 LM723 Both a and b HintAn IC LM150 and LM350 both are adjustable positive voltage regulators28). The three-terminal fixed output voltage regulators are ________ Easy to use Less cost High cost and complexity to use Both a and b HintThe three-terminal fixed output voltage regulators are easy to use and the cost is less29). What is the standard form of AVR? Amplified Voltage Regulator b) c) d) Automatic Voltage Regulator Adjustable Voltage Regulator None of the above HintThe standard form of AVR is Automatic Voltage Regulator30). The minimum output voltage range of an IC 7805 voltage regulator is _______ 5.2V 7.5V 6.2V 4.8V HintThe minimum output voltage range of an IC 7805 voltage regulator is 4.8V31). What is the standard form of CVT? Constant Voltage Transistor Complex Voltage Transistor Constant Voltage Transformer None of the above Hint The standard form of CVT is Constant Voltage Transformer Read more about Transformer32). The ratio of (no load output voltage-full load output voltage/full load output voltage)*100% is known as ____________ regulation Line Load Both a and b None of the above HintThe ratio of (no-load output voltage-full load output voltage/full load output voltage)*100% is known as load regulation33). The output voltage and output current of LM317 adjustable positive voltage regulator is __________ 1.2 to 37V, 1.5 Amp 1.8 to 37V, 1.5 Amp 1.9to 37V, 1.5 Amp 2.0 to 37V, 1.5 Amp HintThe output voltage of the LM317 adjustable positive voltage regulator is 1.2 to 37V, and the output current is 1.5 Amp34). Which IC is a multi-point voltage regulator? 78XX 79XX LM723C None of the above HintAn IC LM723C is a multi-point voltage regulator35). Motorola’s MC1723 is a _________ regulator Fixed output voltage Adjustable output voltage Switching regulator None of the above HintMotorola’s MC1723 is a switching type voltage regulator36). How many types of IC voltage regulators are there? One Two Three Four HintThere are three types of IC voltage regulators are there they are fixed output, adjustable output, and switching voltage regulators37). Which IC is a three-pin type voltage regulator? 78XX 79XX LM723C Both a and b Hint78XX and 79XX series IC’s are three-pin type voltage regulators38). How many pins does an IC 723 voltage regulator have? 10 pins 12 pins 14 pins 8 pins HintAn IC 723 voltage regulator has 14 pins39). What are the advantages of the switching regulator? Small size Higher efficiency Lightweight All of the above HintThe advantages of the switching regulator are they are small in size, efficiency is high, and lightweight40). What are the advantages of the three-terminal voltage regulators? Output noise is low Less efficient Requires high current None of the above HintThe advantage of the three-terminal voltage regulator is that the noise output is lowVoltage Regulator MCQs for Quiz41). What are the components used in voltage regulators? Feedback circuit Pass element control circuit Stable reference voltage All of the above HintThe components used in voltage regulator are feedback circuit, pass element control circuit, and stable reference voltage42). The regulators are categorized into ________ Two Three Four Five HintThe regulators are categorized into five types they are positive and negative adjustable, fixed output, tracking, and floating voltage regulators43). What are the applications of the shunt regulator? Error amplifier Voltage monitoring Precision current limiters All of the above HintThe error amplifier, voltage monitoring, and precision current limiters are the applications of the shunt regulator Read more about Amplifiers44). What are the disadvantages of the linear voltage regulators? Efficiency is high Efficiency is low Requires large space Both b and c HintThe main disadvantages of the linear voltage regulators are that the efficiency is low and requires large space45). The linear series voltage regulator consists of _______ Control element Reference voltage Error detector and sample circuit All of the above HintThe linear series voltage regulator consists of the control element, reference voltage, error detector, and sample circuit46). An IC 723 acts as __________ Clipper Low voltage regulator High voltage regulator Both b and c Hint An IC 723 acts as both a high and low voltage regulator47). How much voltage does an IC 7924 provides? 5V +5V -12V -24V HintAn IC 7924 provides -24 V 48). What is the minimum input voltage of the fixed IC 7805 voltage regulator? 15V 16V 7V 8V HintThe minimum input voltage of the fixed IC 7805 voltage regulator is 7V49). An IC 7824 fixed positive voltage regulator input voltage range is between ____________ 7-25V 8-25V 10.5-25V 27-38V HintAn IC 7824 fixed positive voltage regulator input voltage range is between 27-38V50). The output voltage of an IC 7824 fixed positive voltage regulator is ________ 7V 8V 10.5V 24V HintThe output voltage of an IC 7824 fixed positive voltage regulator is 24V51). The output voltage of an IC 7912 fixed positive voltage regulator is ________ -7V -8V -12V 24V HintThe output voltage of an IC 7912 fixed positive voltage regulator is -12V52). The output voltage of the device LM337 HVH adjustable negative voltage regulator is ______ -1.2 to -37V 8 to 25V 10.5 to 25V 27 to 38V HintThe output voltage of the device LM337 HVH adjustable negative voltage regulator is -1.2 to -37V53). The maximum input voltage of the LM337LZ series adjustable negative voltage regulator is ________ -1.2 to -37V 40V 10.5 V 27 V Hint The maximum input voltage of the LM337LZ series adjustable negative voltage regulator is 40V54). How many methods are there to determine the voltage regulation? One Two Four Eight HintThere are two methods are there to determine the voltage regulation are a direct and indirect method55). The indirect method to determine the voltage regulation is categorized into ___________ One Nine Six Four HintThe indirect method to determine the voltage regulation is categorized into four types they are EMF, MMF, ZPF, and ASA56). What is the standard form of ZPF? Zener Power Factor Zero Power Factor Zero Phase Factor None of the above HintThe standard form of ZPF is Zero Power Factor, it is one type of indirect method used to determine the voltage regulation57). What is the standard form of ASA? Amplifier Standard Association American Standard Association Automation Standard Association None of the above HintThe standard form of ASA is American Standard Association 58). How many pins does an IC 7805 voltage regulator consist of? One Six Three Eight HintAn IC 7805 voltage regulator consists of three pins they are input, output, and ground pins59). In how many conditions does the voltage regulator maintains constant output? One Two Eight Nine Hint The voltage regulator maintains constant output even though input changes or load resistance changes60). How many parameters are there to measure the regulation? One Two Five Seven HintThere are two parameters are there to measure the regulation they are line and load regulationVoltage Regulator MCQs for Engineers61). The ratio of change in the output voltage to the change in the input voltage is known as ______ Line regulation Load regulation Both a and b None of the above HintThe ratio of change in the output voltage to the change in the input voltage is known as line regulation, and the value of the line regulation should be 0%62). The ratio of change in the output voltage from no load to full load to the change in the load current is known as ________ Line regulation Load regulation Both a and b None of the above HintThe ratio of change in the output voltage from no load to full load to the change in the load current is known as load regulation63). When there is no load connected across the circuit that means _________ No load No current Resistance is infinite All of the above HintWhen there is no load connected across the circuit that means there is no load and no current, when there is no current the resistance is infinite64). The ideal value of the load regulation should be ______ 1% 0% 2% 5% HintThe ideal value of the load regulation should be 0%65). When there is no breakdown then the zener diode should be _______ ON OFF HintThe Zener diode will be OFF when there is a no breakdown66). When there is a breakdown then the Zener diode should be _______ ON OFF HintThe Zener diode will be ON when there is a breakdown67). The voltage across the Zener diode _________ Less than or equal to the Zener voltage Greater than or equal to the Zener voltage Equal to the Zener voltage None of the above HintThe voltage across the Zener diode is greater than or equal to the Zener voltage68). Zener diode is widely used in ________ Voltage regulations Rectifiers Clippers None of the above HintZener diode is widely used in voltage regulations to maintain the output voltage constant69). In the case of the series voltage regulator, the controlling element is in _______ Series with load Parallel with load HintIn the case of the series voltage regulator, the controlling element is in series with the load70). In switching regulator _________ acts as switch Diode Rectifier Transistor Relays HintIn switching regulator transistor acts as a switch71). The frequency range of the pulse generator is ______ 10KHz 15KHz 20KHz 25KHz HintThe frequency range of the pulse generator is 20KHz 72). What are the advantages of transistor series voltage regulator? Efficiency is good Output impedance is low Ripple content is low All of the above Hint In a transistor series voltage regulator the output impedance and ripple content is low at the output dc voltage, and the efficiency is good73). The isolated converters are _________ types One Two Five Eight HintThe isolated converters are of two types they are flyback and forward converters74). The buck converter is an another name of __________ voltage regulator Step-up Step-down Adjustable None of the above HintThe buck converter is another name of the step-down voltage regulator75). The boost converter is the another name of __________ voltage regulator Step-up Step-down Adjustable None of the above HintThe boost converter is another name for the step-up voltage regulator76). ____________ are the limitations of the transistor series voltage regulator Power dissipation is low Power dissipation is high Less efficiency Both b and c HintThe limitations of the transistor series voltage regulator are power dissipation is high and the efficiency is less77). What is the standard form of LPS? Load Power Supply Line Power Supply Linear Power Supply None of the above HintThe standard form of LPS is Linear Power Supply78). What are the advantages of the linear power supply? Noise is low Ripple is low Circuitry is simple All of the above HintThe advantages of the linear power supply are noise and ripple is low, and the circuitry is simple79). What is the standard form of SMPS? Switch Mode Power Supply Switch Main Power Supply Simple Mode Power Supply None of the above HintThe standard form of SMPS is Switch Mode Power Supply80). What are the disadvantages of SMPS? Noise is present Circuitry is complex Produces electromagnetic interference All of the above HintIn SMPS due to high frequency switching the noise is present, produces electromagnetic interference, and the circuitry is complexVoltage Regulator MCQs for Interviews81). What are the advantages of SMPS? Heat generation is less Power wastage is less Both a and b None of the above HintThe advantages of the SMPS are the heat generation and power wastage is less82). What are the types of SMPS? DC to DC converter Flyback and forward converter AC to DC converter All of the above Hint The dc to dc converter, flyback, and forward converter, and ac to dc converters are the types of SMPS83). Which one is not an active component? Diodes Transistors Transformers Resistors HintResistors are not active components, it is a passive component Read more about Transformers84). Which one is not a passive component? Diodes Capacitors Inductors Resistors HintDiodes are not passive components, it is an active component 85). The signals are categorized into __________ types One Two Five Four HintThe signals are categorized into two types, they are analog and digital86). The waveshaping are categorized into? One Two Six Four HintWaveshaping is of two types they are linear and non-linear waveshaping87). The filters are categorized into? Five Two Nine Four HintFilters are of four types they are low pass, high pass, bandpass, and bandstop filters88). ___________ is a type of DC voltage regulator Zener diode Transistor series Glow tube All of the above HintThe Zener diode, transistor series, and glow tube are the types of DC voltage regulator89). How many circuits does the regulated power supply consist of? Five Eight Three Nine HintThe three circuits consist of a regulated power supply they are Zener voltage regulator, capacitor filter, and bridge rectifier90). Which IC is a three-pin voltage regulator? Fixed Adjustable Both a and b None of the above Hint Both fixed and adjustable voltage regulators are three-pin voltage regulators91). The shunt regulator efficiency is _________ compared to the series regulator More Less HintThe shunt regulator efficiency is less compared to the series regulator92). The efficiency of the switching regulator is __________ 60% ≤90% >90% None of the above HintThe efficiency of the switching regulator is greater than 90%93). What are the features of IC 723? It provides adjustable voltage output in the range of 2-37V It operates in both positive & negative supply It provides internal power dissipation of 800mW All of the above HintAn IC 723 provides adjustable voltage output in the range of 2-37V, provides internal power dissipation of 800mW, and operates in both positive & negative supply94). The maximum amplifier input voltage of an absolute maximum rating of an IC 723 is ______ 8.5V 9.5V 10.5V None of the above HintThe maximum amplifier input voltage of an absolute maximum rating of an IC 723 is 8.5V95). Internal power dissipation value is _________ of an absolute maximum rating of an IC 723 8.5mV 660mV 105mV None of the above HintInternal power dissipation value is 660mV of an absolute maximum rating of an IC 72396). The voltage in LM317 voltage regulator can be set by using __________ Two external resistors Three external resistors Four external resistors None of the above HintThe voltage in the LM317 voltage regulator can be set by using two external resistors97). The output voltage of an IC 7912 voltage regulator is ________ 8.5V 66V -12V None of the above HintThe output voltage of an IC 7912 voltage regulator is -12V98). The output voltage of LM317 voltage regulator can be adjusted to ________ 1.2V to 37 V 1.4V to 37 V 1.6V to 37 V None of the above HintThe output voltage of the LM317 voltage regulator can be adjusted to 1.2V to 37 V99). LM317 voltage regulator suppliess more than ________ 1.0Amp 1.2Amp 1.5Amp None of the above HintLM317 voltage regulator supplies more than 1.5Amp100). An IC LM317 is a ___________ voltage regulator Adjustable three-terminal positive Adjustable three-terminal negative Adjustable two-terminal positive None of the above Hint An IC LM317 is an adjustable three-terminal positive voltage regulator Time is Up! Time's up
