This article lists 75 Switch Mode Power Supply (SMPS)MCQs for engineering students. All the Switch Mode Power Supply (SMPS) 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 Switch Mode Power Supply (SMPS).
A Switch Mode Power Supply (SMPS) is a type of power supply that uses switching devices, such as transistors or MOSFETs, to convert electrical energy efficiently from one voltage level to another. It is commonly used in electronic devices to provide a stable and regulated DC (direct current) output voltage.
The main advantage of SMPS over linear power supplies is their higher efficiency. Unlike linear power supplies, which dissipate excess energy as heat, SMPS devices regulate the output voltage by rapidly switching the input voltage on and off. This switching operation allows the SMPS to operate at higher frequencies and achieve higher efficiency levels.
The filtered DC voltage is fed into a switching circuit, which includes a power switch (such as a transistor or MOSFET) that rapidly turns on and off. The switching action controls the flow of energy from the input to the output.
Switch mode power supplies are widely used in various applications, including computers, telecommunications equipment, consumer electronics, industrial equipment, and more. They offer advantages such as compact size, high efficiency, and the ability to operate over a wide range of input voltages.
1). Which component is primarily responsible for converting the input voltage in a switch mode power supply?
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Read more about Inductors
2). Which of the following is an advantage of switch mode power supplies compared to linear power supplies?
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3). Which switching device is commonly used in SMPS for high-frequency operation?
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Read more about Metal-Oxide-Semiconductor Field-Effect Transistor
4). Which feedback mechanism is typically used in SMPS to regulate the output voltage?
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Read more about SMPS
5). What is the purpose of a snubber circuit in an SMPS?
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6). Which component in an SMPS is responsible for rectifying the high-frequency AC voltage?
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7). Which type of SMPS topology provides isolation between the input and output circuits?
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8). Which SMPS topology is suitable for stepping up the input voltage?
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9). Which SMPS topology is commonly used for voltage step-down applications?
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10). Which SMPS topology provides bidirectional power flow?
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11). Which SMPS topology is commonly used in high-power applications?
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12). Which SMPS topology is suitable for high-frequency operation?
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13). Which SMPS topology is commonly used for power factor correction (PFC)?
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14). Which SMPS topology provides multiple isolated outputs?
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15). Which type of SMPS provides high efficiency by varying the duty cycle of a high-frequency square wave?
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16). Which SMPS type is suitable for stepping down a higher voltage to a lower voltage?
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17). Which SMPS type is suitable for stepping up a lower voltage to a higher voltage?
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18). Which SMPS type provides isolation between the input and output?
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19). Which SMPS type is commonly used in laptop chargers and mobile phone chargers?
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20). Which SMPS type operates at a constant frequency and requires a low-voltage input?
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21). Which SMPS type is suitable for applications requiring multiple output voltages?
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22). Which SMPS type requires two switches and a center-tapped transformer?
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Read more about Center-Tapped Transformer
23). Which SMPS type is commonly used in automotive applications?
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24). Which SMPS type provides a regulated output voltage even with variations in the input voltage?
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25). Which component is commonly used to store energy in an SMPS?
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Read more about Capacitor
Switch Mode Power Supply (SMPS) MCQ for Quiz
26). Which of the following is a disadvantage of switch-mode power supplies?
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27). Which of the following is an advantage of SMPS over linear power supplies?
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28). Which switching topology is commonly used in low-power SMPS?
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29). Which of the following is a disadvantage of SMPS regarding output voltage noise?
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30). Which component in an SMPS provides electrical isolation between the input and output?
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31). Which of the following is an advantage of SMPS in terms of size and weight?
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32). Which switching topology is commonly used in high-power SMPS, such as computer power supplies?
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33). Which component is responsible for converting AC voltage to DC voltage in an SMPS?
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34). What is the typical switching frequency of an SMPS?
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35). Which of the following is an advantage of a flyback converter?
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36). The duty cycle of a PWM signal in an SMPS determines ________________?
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37). Which component is used to control the duty cycle in an SMPS?
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38). What is the purpose of the feedback loop in an SMPS?
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39). Which component is used to isolate the input and output in an SMPS?
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40). Which type of control is commonly used in current-mode SMPS?
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41). What is the main function of a switching transistor in an SMPS?
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42). Which of the following is commonly used as a control element in SMPS?
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43). Which type of feedback control is commonly used in SMPS?
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44). Which component is used to regulate the output voltage in an SMPS?
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45). What is the typical switching frequency range of an SMPS?
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46). Which component is commonly used to rectify the output voltage in an SMPS?
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47). A switch mode power supply is not providing any output voltage. What could be the possible cause of the problem?
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48). An SMPS is producing excessive ripple voltage at the output. Which component is most likely causing this issue?
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49). The output voltage of an SMPS drops significantly when a load is connected. What could be the possible reason?
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50). An SMPS fails to start up when the power switch is turned on. What could be the likely cause of this problem?
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Switch Mode Power Supply (SMPS) MCQ for Exams
51). An SMPS shuts down immediately after turning on. What is the probable cause?
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52). What is the duty cycle of a switch mode power supply?
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53). Which equation represents the average output voltage of a boost converter?
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54). What is the formula for calculating the peak inductor current in a buck converter?
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55). Which equation represents the switching frequency of a flyback converter?
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56). What is the formula for calculating the output power of an SMPS?
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57). Which equation represents the average output voltage of a boost converter?
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58). Which formula is used to calculate the duty cycle of a buck converter?
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59). What is the formula to determine the output current of an SMPS?
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60). Which equation represents the efficiency of an SMPS?
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61). What is the formula to calculate the ripple voltage in a buck-boost converter?
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62). What is the typical operating frequency range of a switch mode power supply (SMPS)?
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63). Why are higher frequencies preferred in SMPS designs?
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64). What happens to the size of transformers used in SMPS as the operating frequency increases?
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65). What is the primary advantage of operating an SMPS at higher frequencies?
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66). Which parameter defines the maximum frequency at which an SMPS can operate?
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67). What is the term used to describe the ratio of on-time to off-time for the switching transistor in an SMPS?
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68). How does increasing the operating frequency of an SMPS affect its efficiency?
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69). What is the typical range of duty cycle for an SMPS?
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70). What is the typical input voltage range of a universal input SMPS?
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71). Which of the following is a common switching frequency used in SMPS?
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72). What is the typical input voltage range of a universal SMPS?
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73). Which of the following is a common output voltage range for an SMPS used in computer power supplies?
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74). What is the typical frequency range of an SMPS?
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75). Which of the following SMPS types is suitable for applications requiring galvanic isolation?
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