Power Amplifier Question & Answers July 28, 2022 By WatElectronics This article lists 100 Power Amplifier MCQs for Engineering Students. The Power 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 the Power Amplifier. The intention of utilizing amplifiers in the circuits is to enhance the weak signal's strength with the power supply connected externally. A signal applied can be either voltage, current, or power. So, based on the type of signal applied at the input & the modification needed, amplifiers are categorized. The various types of amplifiers are Voltage amplifiers, Current amplifiers, and Power amplifiers. Power amplifiers are used to deal with the large power signals in the circuit. The enhanced strength of power signals can be used in driving loads of devices like headphones, and speakers. Unlike other amplifiers, the powerful ones are connected directly to the output to drive loads. It is the final and the last block in the chain of amplifiers. Applied input to the Power amplifier must be above the threshold limit. For this purpose, pre-amplification is needed. It can be done by using Voltage or Current amplifiers as pre-amplifiers. Based on the variant of device connected at outcome these amplifiers are categorized as Audio, DC & RF power amplifiers. Name Email 1). _______ enhances the strength of the Power signal? Power Amplifiers Voltage Amplifiers Current Amplifiers None None Hint 2). A Power transistor is used in amplifying ______? Power Current Voltage b & c None Hint 3). What are the various power transistors? Induction Transistors (Static) MOSFETs BJTs All Mentioned Above None Hint 4). What type of amplifiers deliver large powers to load? Power Amplifiers Voltage Amplifiers Current Amplifiers Ultrasonic Amplifiers None Hint 5). What is the main agenda of Power amplifiers? Supply Large Powers Handle Large Currents a & b To Amplify Currents None Hint 6). The size of the power transistor is _____? Large Small Meagre Thin None Hint 7). Heat sink in power transistor is placed at ______? Collector Collector-Base Junction Base Emitter None Hint 8). How does the emitter region of power transistors doped? Lightly Heavily Moderate Undoped None Hint 9). Input resistance of power transistor is _____. High Moderate Low Infinite None Hint 10). What is the condition to transfer maximum power? Low Resistance Maximum Current Impedance Matching Load Effect None Hint 11). Power Amplifier is _____________ in size? Bulky Small Light Compact None Hint 12). Which one is a Power Amplifier? Audio Amplifiers Integrated Amplifiers Current Amplifiers Voltage Amplifiers None Hint 13). AC power achieved by Power amplifiers is _____. High Moderate Low Very High None Hint 14). What type of coupling is used in Power Amplifiers? Resistor Coupling Capacitor Coupling Transformer Coupling RC Coupling None Hint 15). What is the consistency of the Base region in power amplifiers? Thick Slender Thin Runny None Hint 16). Cooling system is required for _________? Integrated Amplifiers Power amplifiers Current Amplifiers Voltage Amplifiers None Hint 17). Why is Transformer Coupling used in Power amplifiers? Low Resistance Maximum Current Impedance Matching Load Effect None Hint 18). Power amplifiers have __________ at output? Harmonic distortion Distortion Less High Resistance High Inductance None Hint 19). For Audio applications , power amplifiers are placed at ______? Initial Stage Final Stage Middle Stage a & b None Hint 20). What is the important factor that determines an amplifier's efficiency? Applied Input Operating Point Q-Point b & c None Hint 21). What are the various power amplifiers classified considering frequency? Audio Power Amplifiers Radio Power Amplifiers a & b Integrated Amplifiers None Hint 22). What are the factors that contribute to obtaining maximum power at the outcome? Collector Efficiency Power Dissipation Distortion& Capacity All Mentioned Above None Hint 23). What describes how an amplifier converts DC to AC power? Collector Efficiency Power Dissipation Distortion& Capacity All Mentioned Above None Hint 24). What will be the efficiency for the battery supply of 10 Wand the AC power at the output is 2W? 10% 20% 30% 40% None Hint 25). What increases the transistor's temperature? Applied Input Biasing Heat Active Devices None Hint Power Amplifier MCQs for Interviews 26). What alters the q-point of the transistor? Applied Input Biasing Heat Active Devices None Hint 27). The capability to dissipate heat is referred to as ______? Collector Efficiency Power Dissipation Distortion& Capacity All Mentioned Above None Hint 28). What should be the distortion to obtain a better outcome? Less More High Increased None Hint 29). What should be the collector efficiency of power amplifiers? High Moderate Low Reduced None Hint 30). What does the classification of Power amplifiers determine? Characteristics Performance a & b Output None Hint 31). Power amplifiers classified based on ___________line of load? Applied Input Operating Point Q-Point b & c None Hint 32). What are the various types of power amplifiers? Class A Class B Class AB All Mentioned Above None Hint 33). For class A position, Q-point is at _______ of Load line. Center Cut-off region Above Cut-off Below Cut-off None Hint 34). For class B position of Q-point is at _______ of the Load line? Center Cut-off region Above Cut-off Below Cut-off None Hint 35). For class C position of Q-point is at _______ of the Load line? Center Cut-off region Above Cut-off Below Cut-off None Hint 36). For class AB position of Q-point is at _______ of the Load line? Center Cut-off region Above Cut-off Below Cut-off None Hint 37). Which class of power amplifier conducts for the full duration of the cycle? Class A Class B Class AB All Mentioned Above None Hint 38). What is the angle of conduction of class A amplifiers? 0 180 270 360 None Hint 39). What is the efficiency of a class A power amplifier? 25 to 50 % 50 % 78 % 78 to 90% None Hint 40). Which class of power amplifier has the lowest efficiency? Class A Class B Class AB All Mentioned Above None Hint 41). The voltage at output obtained in class A Amplifiers is _____? Distorted Distortion Less Inverted b & c None Hint 42). The signal at output obtained for class B amplifiers is ______? Full-cycle Half-cycle Reduced Half Complete 360 None Hint 43). What is the conduction angle of the transistor in the class B amplifier? 0 180 270 Complete 360 None Hint 44). How the transistor in class B amplifier reacts to absent input of AC? Transistor is OFF Transistor is ON Transistor Conducts Transistor Operates None Hint 45). (VCC, 0) is the Q-point coordinate of _______ amplifier? Class A Class B Class AB All Mentioned Above None Hint 46). How the distortion is eliminated in Class B amplifiers? Using a Transistor Using Two Transistors Multiple Transistors Used Resistor used None Hint 47). Class B amplifier efficiency is _____? 50% 60.5% 78.5% 90% None Hint 48). What amplifiers have crossover Distortion? Class A Class B Class AB All Mentioned Above None Hint 49). Class AB amplifiers eliminate _________? Crossover Distortion Heat Temperature Resistance None Hint 50). Why class B is advantageous in comparison to class A? High Efficiency Zero Power Dissipated Impedance Matching All Mentioned Above None Hint Power Amplifier MCQs for Quiz 51). What configuration is preferred in audio systems? Class A Class B Class AB All Mentioned Above None Hint 52). Efficiency of class AB Amplifier is ___than Class B? Less More High Increased None Hint 53). Class C conducts for ____ than half of the cycle? Less More High Increased None Hint 54). _____ are not preferred for AF? Class A Class B Class AB Class C None Hint 55). What is the efficiency of class C amplifiers? 50% 60.5% 78.5% 95% None Hint 56). Which amplifiers are utilized as Tuned circuits? Class A Class B Class AB Class C None Hint 57). What are the drawbacks of class C power amplifiers? RF interference is more Difficulty Obtaining Coupling Transformers Reduced Dynamic Range All Mentioned Above None Hint 58). Which amplifier is preferable for Radio Frequency applications? Class A Class B Class AB Class C None Hint 59). What are the modes of Class C power amplifiers? Tuned Un-tuned a & b Mixed None Hint 60). In RF applications _______ amplifiers are used? Class A Class B Class AB Class C None Hint 61). ________ is switching amplifier? Class A Class B Class C Class D None Hint 62). Low cost designing prefer _________ amplifiers? Class A Class B Class AB Class C None Hint 63). Which class of power amplifier has distortion maximum? Class A Class B Class AB Class C None Hint 64). What is the reason behind using Push –pull configuration in class B amplifiers? RF interference is more Difficulty obtaining Coupling Transformers Reduced Dynamic Range Improve Efficiency None Hint 65). What are the classifications based on the Push-pull amplifier? Class A Class B Class AB All Mentioned Above None Hint 66). What are the transistors present in the push-pull circuit? PNP NPN UJT a & b None Hint 67). ________ is preferably placed in RF Power Amplifier. Linear Amplifier Non-Linear Amplifier Initial Amplifier Final Stage Amplifier None Hint 68). Which power amplifier has the highest linearity? Class A Class B Class AB Class C None Hint 69). Which power amplifier doesn’t have cross-over distortion? Class A Class B Class AB Class C None Hint 70). Which of these amplifiers is highly efficient? Class A Class B Class C Class D None Hint 71). ______ amplifier produces linear and less distorted output. Class A Class B Class AB Class C None Hint 72). Which amplifier has the highest fidelity of sound? Class A Class B Class C Class D None Hint 73). Which power amplifier is preferred for higher gains? Class A Class B Class C Class D None Hint 74). What are the classes of linear amplifiers? Class A Class B Class C All Mentioned Above None Hint 75). Which class of amplifiers utilizes an active element as a Current-controlled source? Class A Class B Class C All Mentioned Above None Hint Power Amplifier MCQs for Students 76). What is determined by applying biasing at the input? Distortion Operating Point Q-Point Class None Hint 77). How does the power amplifier become efficient? Using a Transistor Using Two Transistors Multiple Transistors Used Using a Transistor as Switch None Hint 78). Which switching amplifier is not often utilized in RF applications? Class A Class B Class C Class D None Hint 79). _________ used in driving another source with high power? RF power amplifiers AF Power Amplifiers Integrated Amplifiers a & b None Hint 80). RF amplifiers with LDMOS used in ________? Semiconductors Power Semiconductor Devices Conductors Insulators None Hint 81). ______ amplifier used in digital networks? LDMOS-based RF amplifiers AF Amplifiers MOSFETs FETs None Hint 82). The output produced by the RF amplifier is ___? Linear Non-Linear Distorted Distortion Less None Hint 83). Why there is a cross-over distortion in class B? Center Cut-off Region Above Cut-off Below Cut-off None Hint 84). How is the cross-over distortion avoided in class AB? Center Cut-off Region Above Cut-off Below Cut-off None Hint 85). Class A amplifier has the active device in __________ configuration. Common Emitter Common Base Common Collector Common Source None Hint 86). Power amplifier circuit possess ___? Positive Feedback Negative Feedback No Feedback Required a & b None Hint 87). Why is negative feedback used in power amplifiers? Reduce Distortion Reduce Noise Increase Bandwidth All Mentioned Above None Hint 88). What is the conduction angle of the Class C amplifier? < 180 90 to 150 >180 a & b None Hint 89). Which amplifier is used as Collector Modulator? Class A Class B Class C All Mentioned Above None Hint 90). Conduction angle = 0 in ________amplifier? Class A Class B Class C Class D None Hint 91). What class of amplifier is utilized in communications? Class A Class B Class C All Mentioned Above None Hint 92). What class of amplifiers is preferable for Bass? Class A Class AB Class H b & c None Hint 93). Which amplifiers are referred to as Rail Trackers? Class A Class AB Class H b & c None Hint 94). What is referred to as ice amplifier? Class A Class AB Class D b & c None Hint 95). PWM amplification addressed as ________? Class A Amplification Class AB Amplification Class C Amplification Class D Amplification None Hint 96). What is the switching frequency of class d amplifiers? 250KHz to 1.5 MHz 150 KHz 1.2MHz 450 KHz None Hint 97). Which modulator is utilized in the class S amplifier? Delta Sigma Delta-sigma None None Hint 98). Which switching amplifier is used USD in amplification of low-frequency? Class D Class E Class S Class T None Hint 99). What are the applications of RF power amplifiers? Driving Transmitters Antenna Exciting Microwave Cavity Resonators Driving Another Source of High Powers All Mentioned Above None Hint 100). __________ are placed at the transmitter’s last stage. RF Power amplifiers Voltage Amplifiers Current Amplifiers AF Amplifiers None Hint Read More about Power Amplifier For More MCQs Low Noise Amplifier Question & Answers Cascode Amplifier Question & Answers BJT Amplifier Question & Answer Please fill in the comment box below. Time's up
