Power Diode Question & Answers September 24, 2022 By WatElectronics This article lists 40 Power Diode MCQs for engineering students. All the Power Diode 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 Power Diode. Diodes are the basic electric component made of semiconducting material. It behaves in a unidirectional way in terms of conducting current. It conducts for only positive voltages and blocks reverse currents. Rectification can be obtained using semiconducting diodes. For operating large voltages or blocking high reverse currents a small diode of semiconducting material is not enough. For these purposes, power diodes are introduced. Power Diodes significantly have a large junction of PN so they can tolerate larger forward voltages and block high reverse currents. A semiconductor diode having a junction large is referred to as Power Semiconductor Diode simply known as Power Diode. Power Diodes because of larger junction areas don't fit for higher frequencies applications. Schottky diodes are introduced for these purposes due to their shorter reverse time of recovery. Uncontrolled power rectification is provided by making use of power diodes. 1). How do power diodes differ from basic semiconducting diodes? Terminals Conducting Behavior Doping Concentration of Junction All Mentioned Above None Hint 2). The junction in Power diode consists of _____________? Heavily Doped P+ Lightly Doped P+ Heavily Doped N- Both P+ & N- Heavily Doped None Hint 3). __________ grown epitaxially on N+ layer i.e., doped heavily? Heavily Doped P+ Lightly Doped N- Heavily Doped N- Both P+ & N- Heavily Doped None Hint 4). What makes power diodes to be used in higher power areas of applications? P+ Layer N- Layer N+ Layer P- Layer None Hint 5). What makes a power diode have greater voltages of breakdown? Increased Depletion Region Thickness Increased Space Charge Region a & b Increased Doping Levels None Hint 6). What increases Ohmic resistance in Power diodes? P+ Layer N- Layer N+ Layer P- Layer None Hint 7). Power diode of multiple mountings used for the proper ___________? Doping Temperature Voltages Heat Dissipation None Hint 8). N- if doped lightly almost like intrinsic then the device becomes _________? Varactor Diode Schottky Diode PIN Diode Zener Diode None Hint 9). Power diodes have increased the width of the Space charge region leading to ____________? Increased Thickness of Depletion Region Blocks Larger Reverse Voltages Allows Large Reverse Voltages a & b None Hint 10). What type of diodes have higher amount of Forward currents? Varactor Diode Light Emitting Diode Power Diode Zener Diode None Hint 11). The V-I curve of characteristics in Power diodes are almost _________? Exponential Logarithmic Linear Non-Linear None Hint 12). What depicts max, reverse voltages a power diode can handle? Peak Voltage Reverse Voltage Peak Reverse Repetitive Voltage Forward Voltage None Hint 13). What happens if power diodes exceed VRRM? High Reverse Currents Unable to Dissipate Excess Heat Diode gets Destroyed All Mentioned Above None Hint 14). VRRM is also known as __________? Peak Voltage Reverse Voltage Repetitive Voltage Peak Inverse Voltage None Hint 15). The time at which forwarding currents reach 0 instantly and Reverse current decays up to 25% IRR? Reverse Time Recovery Time Inverse Time Reverse Recovery Time None Hint 16). After what power do diodes achieve Reverse Blocking Capability? Reverse Time Recovery Time Inverse Time Reverse Recovery Time None Hint 17). The trr is the combination of _____________? Time when Charge Removed from Depletion Region Time when Charge Removed from Semiconductor Region Time when Charge doesn't Remove Semiconductor a & b None Hint 18). Reverse recovery time and Reverse recovery currents both depend on _______? Reverse Recovery Voltage Reverse Recovery Charge Inverse Voltages Peak Voltages None Hint 19). What is the parameter of the power diode depicted from Turn-off characteristics? Peak Current Peak Charge Harshness Factor Softness Factor None Hint 20). At what instant, power diode is referred to as Soft-recovery Diode? S-factor = 1 S-factor = 0 S-factor = Infinity S-factor ≠1 None Hint Power Diode MCQs for Exams 21). If S-factor is lesser than a unit then power diodes are known as ______? Soft-recovery Diode Fast Recovery Diode Snappy-recovery Diode b & c None Hint 22). What determines the transient voltage of the power diode? Peak Voltage Peak Inverse Voltage Q-factor S-factor None Hint 23). S-factor of a Power diode is low implies _____________? Low Oscillatory Reverse Voltage High Transient Overvoltage Power Loss Low Transient Overvoltage None Hint 24). If S-factor is high implying _________ of a power diode? Low Oscillatory Reverse Voltage High Transient Overvoltage Power Loss High Oscillatory Reverse Voltage None Hint 25). Total loss of power when the power diode is OFF is given by the product between _____________? Voltage During trr Diode Current Diode Temperature a & b None Hint 26). What is the recovery time of general-purpose diodes? < 5 µs Nano Seconds Nearly 25 µs Nearly Seconds None Hint 27). What are the various applications of General-purpose Power Diodes? UPS Battery Chargers Welding All Mentioned Above None Hint 28). What is used for doping fast-recovery diodes? Silver Gold Copper Aluminum None Hint 29). High-frequency rectifiers use ______ power diodes? General-purpose Diode Schottky Diode Fast-Recovery Diode Zener Diode None Hint 30). Why it is advantageous to use Fast-recovery diodes? Low Reverse Recovery Time High Switching Speed Good Efficiency All Mentioned Above None Hint Power Diode MCQs for Interviews 31). Recombination centers increased because of ___________ added in Fast-recovery diodes. Silver Gold Copper Aluminum None Hint 32). What type of Power diode is used in SMPS? General-purpose Diode Light Emitting Diode Fast-Recovery Diode Zener Diode None Hint 33). What are the ratings of voltages that characterize power diodes? Repetitive Peak Inverse Voltage Non-Repetitive Peak Inverse Voltage Peak Voltage a & b None Hint 34). Which rating of voltage describes the blocking ability of Power Diodes? Repetitive Peak Inverse Voltage Non-Repetitive Peak Inverse Voltage Peak Voltage a & b None Hint 35). Other than Voltage ratings what are the characteristics of a Power diode? Average Currents RMS Current Peak Current All Mentioned Above None Hint 36). What happens to the current at the anode of a power diode for reverse bias? Zero Constant Infinite 0.2 Watts None Hint 37). Which power diode has trr equivalent to nanoseconds? General-purpose Diode Schottky Diode Fast-Recovery Diode Zener Diode None Hint 38). What type of power diodes are used in Chopping circuits? General-purpose Diode Schottky Diode Fast-Recovery Diode Zener Diode None Hint 39). What diodes have higher ohmic drops? Varactor Diode Light Emitting Diode Power Diode Zener Diode None Hint 40). What below used as a Free-wheeling Diode? Varactor Diode Light Emitting Diode Power Diode Zener Diode None Hint Read More about Diodes For More MCQs Gunn Diode Question & Answers Ideal Diode Question & Answers PIN Photodiode Question & Answers Photodiode Question & Answers Varactor Diode Question & Answers PN Junction Diode Question & Answers Avalanche Photodiode Question & Answers Tunnel Diode Question & Answers Schottky Diode Question & Answers Zener Diode Question & Answers Please fill in the comment box below. Time's up
