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Class D Amplifier Question & Answers

July 30, 2022 By WatElectronics

This article lists 100 Class D Amplifier MCQs for Engineering Students. The Class D Amplifier Questions & Answers below include solutions and links to the relevant topic. This is helpful for users who are preparing for their exams and interviews, or professionals who would like to brush up on the fundamentals of Class D Amplifier.

Amplifiers to drive the connected loads and tolerates large currents by amplifying or enhancing the power signal strength are referred to as Power Amplifiers. These are connected at the final stages of the chain. To make it operate the applied input must be above the threshold.

Based on the output obtained and the characteristics these amplifiers are classified into various classes. They are: Class A, Class B, Class C, Class AB, Class D, Class E, Class F, and so on. Further, these amplifiers are divided into two groups based on the output obtained.

Firstly, linear amplifiers are class A, Class B, Class C, and Class AB. The second group i.e., Class D, Class E, class F, and so on are referred to as Switching amplifiers. It provides Non-linear Switching.

Class D amplifier functions by taking two-state or binary signals from the control signal i.e., continuous, and amplifying it by using Power switches.  This amplifier is highly efficient compared to linear ones.

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1). ________ is referred to as Switching Amplifier?

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2). Active devices in Class D amplifier are _______?

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3). What will be the current in the class D amplifier if the transistor is switched OFF?

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4). Power dissipated in class D amplifiers is ___?

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5). Heat sinks placed in Class D amplifiers are ___?

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6). How efficient are class D amplifiers?

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7). What are the basic requirements of class D amplifiers?

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8). Class D amplifiers have the angle of conduction ___?

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9). _____ operates from deriving a signal consisting of two states?

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10). ______ takes analog i/p signal and generates PWM wave?

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11). What type of filter is required in class D amplifiers?

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12). Why do class D amplifiers use advanced techniques of modulation?

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13). Eliminating filters connected externally paves the way for _______ in class D amplifiers?

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14). What are the disadvantages of class AB compared to class D?

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15). What is required in class D to attenuate noise?

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16). The losses in the output of class D are based on _______?

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17). What are the topologies of class D?

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18). Half bridge of Class D is _______ than Full bridge?

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19). Which topology of class D is preferred for audio performances?

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20). Two Half-bridge amplifiers combined with the other components to form __________?

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21). Which topology of class D makes better usage of the PWM scheme?

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22). Non-linearity in PWM of class D amplifier is because of _____?

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23). What are the timing errors included in class D amplifiers?

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24). What are the imperfections caused due to distorted waves generated from class D?

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25). What are the essentials of a Half Bridge Class D amplifier?

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Class D Amplifier MCQs for Quiz

26). ______ operates as Current Steering Switches in Half Bridge Class D amplifier?

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27). What are the downfalls of the Half Bridge Class D amplifier?

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28). The outputs quality in the Half Bridge Class D amplifier is dependent on ________?

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29). Open-loop Band width is equivalent to frequency of switching in _______?

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30). What happens in Class D amplifiers if the loop bandwidth is increased?

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31). In how many ways Class D amplifiers (self-oscillating) are designed?

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32). Gain in class D amplifiers is ________?

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33). What is the Power Supply Rejection Ratio of Class D?

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34). What is used in class D to overcome variations of bus voltages?

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35). What is the Power Supply Rejection Ratio of Linear amplifiers?

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36). How is the energy flow in Full bridge class D amplifiers?

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37). How is the energy flow in Half-bridge class D amplifiers?

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38). Bus pumping occurs in _____?

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39). Bus pumping causes _____ to get charged?

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40). Bus pumping usually occurs at ______?

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41). Reference signal in Class D is ______?

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42). Duty cycle in class D is ______?

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43). What are the differences between Synchronous Buck Converter & Class D amplifier?

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44). Class D amplifier contains _______ for both MOSFETs?

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45). Dead time in class D leads to _____?

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46). What are the different regions in class D?

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47). What happens in the middle region of class D?

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48). ZVS is _____________?

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49). Outcome timing in middle region is _________ of dead time.

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50). Is there any distortion in the middle area of operation in class D?

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Class D Amplifier MCQs for Exams

51). Reliability is achieved in class D if the dead time is ____?

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52). MOSFETS in class D enters shoot-through condition if dead time is ___.

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53). What type of active device used is advantageous in Class D?

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54). MOSFET consist of _______?

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55). MOSFET in class D leads to _____?

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56). IR Digital MOSFETs are designed for ______?

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57). How does the saw-tooth wave gets mixed with applied input?

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58). What should be the frequency of the saw-tooth wave?

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59). What represents digitized audio signals in a comparator of class D?

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60). What is the purpose of the Switching circuit in class D amplifiers?

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61). Low pass filter (LPF) in class D purpose is to filter ________?

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62). What feedback in class D was utilized to make it error-free?

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63). How the feedback loop is inserted at the output stages of class D amplifiers?

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64). How the filter is included in the feedback of class D?

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65). Feedback in class D controls ______?

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66). How do the transistors of class D power amplifier act?

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67). What is the major drawback of class D power amplifier (Traditional)?

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68). Which topology of class D is preferred when the power is high?

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69). What is BTL?

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70). Alternate conduction establishes a path through Load in ______ topology?

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71). DC Blocking Capacitor is not essential in _______?

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72). What is the disadvantage of not connecting an external filter?

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73). To achieve maximum output power speaker load must be _________?

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74). How EMI is minimized in class D amplifiers?

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75). What Spread-spectrum modulation does to minimize EMI?

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Class D Amplifier MCQs for Students

76). Modern class D inhibits all the advantages of _________?

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77). Automotive sound systems use ________ amplifiers?

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78). What are the Low Power Portable Applications of Class D?

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79). Flat Panel Display uses ______ amplifiers?

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80). Class D amplifiers output stage is utilized as _______?

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81). What is the transition time required by the states of class D amplifier?

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82). What are the characteristics (ideal) of Class D amplifiers?

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83). Dead time in class D is proportional to ______?

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84). Switching and Conduction losses are minimized by using ______.

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85). What should be the die size in the class D amplifier?

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86). IRF6645 Class D suits for?

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87). Power supply must be ________ in Class D amplifiers?

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88). High Response of frequency in class D is ________ on Loudspeaker impedance?

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89). What is the basic difference between class D and other linear classes?

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90). Why class D amplifiers are advantageous?

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91). What is the drawback of class D amplifiers?

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92). Sound Reinforce system makes use of _____ amplifiers?

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93). What are Car Class D Amplifiers?

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94). What type of amplifiers are used in mobile phones?

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95). What are the applications of Class D amplifiers?

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96). Home Theater systems use _____ Amplifiers?

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97). Class D for Subwoofer is ______?

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98). Class D Power Amplifiers of Linn’s Proprietary provides _______?

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99). Hearing aids have ______ amplifier?

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100). _______ amplifiers are utilized in high power implementations?

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