Avalanche Photodiode Question & Answers February 9, 2022 By WatElectronics This article lists 100 Avalanche Photodiode MCQs for engineering students. All the Avalanche Photodiode 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 their fundamentals on Avalanche Photodiode. Avalanche photodiode is a source-independent semiconductor device. This diode was discovered by Jun-ichi a Japanese scientist. Avalanche photodiode works on the principle of photoelectric effect where the input provided to this diode is in light form and output obtained is in electric form. Avalanche photodiode is designed using Silicon and InGaAs materials and consists of 2 terminals Anode and Cathode. This diode has a similar operation to the Zener diode. It operates in the depletion region with a higher value of negative resistance in reverse bias conditions. The operation of Avalanche photodiode is calibrated using VI characteristics which is a 2D representation. Breakdown in this diode is observed in the negative region or reverse bias region with an increase in negative voltage, thereby increasing the negative value of current and resistance. The advantages of Avalanche photodiode include high gain, enhanced speed, and high sensitivity. The demerits of Avalanche photodiode include high input voltage, high noise, and nonlinear output. They are mainly used in laser range finders, fiber optics, and quantum sensing. 1). A Avalanche Photo diode has ____ sensitivity photo diode based detector? High Low Moderate Zero Hint 2). An Avalanche Photo diode is designed with ____ substance? Conductor Semiconductor Insulator All the above Hint 3). Which of the following scientist discovered Avalanche Photo diode? Jun-ichi Charles Denis Richard Harry Hint 4). Which of the following are the typical applications of Avalanche Photo diode? Laser range finders Fiber optics Quantum sensing All the above Hint 5). Which of the following are the current applications of Avalanche Photo diode? Positron emission tomography Practical physics Telecommunication Both a and b Hint 6). Which of the following is the principle of operation of Avalanche Photo diode? Photo electric effect Quantum theory EM theory All the above Hint 7). Which of the following is the input signal form to a Avalanche Photo diode? Optical Electrical Mechanical All the above Hint 8). Which of the following is the output signal obtained form to Avalanche Photo diode? Optical Electrical Mechanical All the above Hint 9). A Avalanche Photo diode operates in ____ bias condition? High reverse High forward Low reverse Low forward Hint 10). The representation of a Avalanche Photo diode is similar to ____ diode? PIN diode Zener diode PN diode Varactor diode Hint 11). Identify the following diode. Diode Avalanche photodiode PN diode Varactor Diode Both a and b Hint 12). How many terminals do a avalanche photodiode comprises of? 1 2 3 4 Hint 13). A avalanche photodiode has ___ number of heavily doped regions? 1 2 3 4 Hint 14). A avalanche photodiode has ___ number of lightly doped regions? 1 2 3 4 Hint 15). Which of the following are the heavily doped regions in avalanche photodiode? P+ N+ I Both a and b Hint 16). Which of the following are the lightly doped regions in avalanche photodiode? P N+ I Both a and c Hint 17). How many layers do a avalanche photodiode comprises of? 3 4 5 6 Hint 18). The width of depletion layer in intrinsic region is ______ with respect to PIN photodiode? Thick Thin Wide Large Hint 19). Which of the following acts as anode in Avalanche photodiode? N+ P+ P I Hint 20). Which of the following acts as cathode in Avalanche photodiode? N+ P+ P I Hint 21). Avalanche photodiode works in ______ bias condition? Forward Reverse Both a and b Zero bias Hint 22). In reverse bias condition the diode negative terminal is connected to _____ terminal of battery? Negative Positive Open circuited Both a and c Hint 23). In reverse bias condition the diode positive terminal is connected to _____ terminal of battery? Negative Positive Open circuited Both a and c Hint 24). The gain of Avalanche photodiode is _____? 0 1 ¼ High Hint 25). At ___ voltage Avalanche photodiode experiences Avalanche breakdown? Forward bias Reverse bias Zero bias Open circuited Hint Avalanche Photodiode Interview Questions and Answers 26). The electric field in Avalanche photodiode exceeds ____ region? Active Saturation Depletion Both b and c Hint 27). Light in Avalanche photodiode is incident on ____ region? P+ N+ I P Hint 28). Which of the following region in Avalanche photodiode absorbs light incident? P+ N+ I P Hint 29). Which of the following region in Avalanche photodiode has high resistive capacity? P+ N+ I P Hint 30). In which of the following region of Avalanche photodiode electron-hole pairs are generated? P+ N+ I P Hint 31). A P-type has majority as ____ charge carriers? Electrons Holes Neutrons All the above Hint 32). A N-type has majority as ____ charge carriers? Electrons Holes Neutrons All the above Hint 33). At what velocity value charge carriers collide in Avalanche photodiode? Zero High Low Constant Hint 34). _____ result in generation of photo current in Avalanche photodiode? Electrons Holes Neutrons Both a and b Hint 35). In which of the following region Avalanche photodiode operates? Active Saturation Depletion All the above Hint 36). Which of the following is the additional mode of operation of Avalanche photodiode? Geiger Linear Avalanche mode Active Both a and b Hint 37). An Avalanche photo diode experience _____ type of breakdown? Zener Avalanche PN PIN Hint 38). Which of the following is the formula of Avalanche breakdown in Avalanche photodiode? Ea=Va/d Ea=d/Va d=E/d V= E/a Hint 39). Identify the type of diodes characteristics below? Graph PN Zener PIN Avalanche photo Hint 40). A Avalanche photo diode characteristics is plotted in _____ dimensions? 1 2 3 4 Hint 41). Which of the following parameters are used while plotting Avalanche photo diode characteristics? VI IR RV IVR Hint 42). Which of the following parameter is plotted on X-axis of Avalanche photo diode? V I R T Hint 43). Which of the following parameter is plotted on Y-axis of Avalanche photo diode? V I R T Hint 44). Which of the following represents forward bias characteristics in Avalanche photo diode? +V and +I +V and –I –V and +I –V and –I Hint 45). Which of the following represents reverse bias characteristics in Avalanche photo diode? +V and +I +V and –I –V and +I –V and –I Hint 46). Which of the following is the SNR formula of Avalanche optical fiber? Power of photo current/photodetector power +Noise power of amplifier Power of photo current/photodetector power - Noise power of amplifier Power of photo current+ photodetector power +Noise power of amplifier Power of photo current - photodetector power +Noise power of amplifier Hint 47). The value of quantum efficiency is _____ for perfect SNR value? Low High Zero Constant Hint Read more about SNR. 48). The speed of operation factor of Avalanche photo diode is _____? Low High Zero Constant Hint 49). Avalanche photo diode calculates ___ range of light? Low High Zero Constant Hint 50). A Avalanche photo diode is designed using _____ materials? Silicon InGaAs Fe Both a and b Hint Avalanche Photodiode MCQs for Exams 51). The performance of Avalanche photo diode depends on ____ parameter? Efficiency Light absorbed Light emitted Power dissipated Hint 52). The value of noise in Avalanche photo diode is ____? High Low Zero Constant Hint 53). The silicon substance gain in Avalanche photo diode is ___? High Low Zero Constant Hint 54). The silicon substance noise in Avalanche photo diode is ___? High Low Zero Constant Hint 55). ____ is defined as function of width of depletion to carrier drift velocity? Carrier transit time Carrier speed time Depletion speed All the above Hint 56). The value of capacitance in Avalanche photo diode must be____? Increased Minimized Zero Constant Hint 57). At which condition the value of capacitance in Avalanche photo diode must be minimized? Higher sensitivity High speed Low noise All the above Hint 58). Which of the following is the capacitance formula of Avalanche photo diode? C= eA/W C= A/W C=eW/A C=e/W Hint 59). Which of the following is the equation of width in Avalanche photo diode? w=xp+xn w=xp-xn w=xp/xn All the above Hint 60). Which of the following Bandwidth of Avalanche photo diode? B=1/2πRC B=1+2πRC B=1-2πRC B=1/πRC Hint 61). Which of the following are the advantages of Avalanche photo diode? High gain High sensitivity Enhance speed All the above Hint 62). Which of the following are the demerits of Avalanche photo diode? High input voltage High noise Non linear output All the above Hint 63). A PIN diode has ___ layers compared to Avalanche photo diode? 2 3 4 5 Hint 64). The response time in Avalanche photo diode is _______? High Low Zero Constant Hint 65). The output current in Avalanche photo diode is _______? High Low Zero Constant Hint 66). The response time in PIN diode compared to Avalanche photo diode is _______? High Low Zero Constant Hint 67). The output current in PIN diode compared to Avalanche photo diode is _______? High Low Zero Constant Hint 68). Which of the following is the internal gain value of Avalanche photo diode? 100dB 200dB 300dB 400dB Hint 69). dB stands for ___? Decibels Decimals Decoders Dividers Hint 70). The internal gain value of Pin diode compared to Avalanche photo diode is_____? 100dB Constant Insignificant 0 Hint 71). The sensitivity of Pin diode compared to Avalanche photo diode is ____? High Low Zero Constant Hint 72). The noise factor of Pin diode compared to Avalanche photo diode is ____? High Low Zero Constant Hint 73). The reverse bias based voltage of Pin diode compared to Avalanche photo diode is ____? High Low Zero Constant Hint 74). A Avalanche photo diode has ____ value of temperature stability? High Low Zero Constant Hint 75). A Pin diode compared to Avalanche photo diode has ____ value of temperature stability? High Low Zero Constant Hint Read more about Temperature. Avalanche Photodiode Quiz Questions and Answers. 76). Temperature is measured in terms of ____? Farads Centigrade Bits/seconds Amperes Hint 77). Which of the following component is not necessary in Avalanche photo diode? Amplifier Capacitor Resistor Battery Hint 78). Which of the following component is necessary in Pin diode compared to Avalanche photo diode? Amplifier Capacitor Resistor Battery Hint 79). Photo electric effect emits ___ carriers? Holes Electrons Neutrons All the above Hint 80). When electrons are emitted from a diode due to incidence of em waves then the process is called ______? Photo electric effect Photo absorbing effect Diffusion effect All the above Hint 81). Electrons emitted due to EM waves are ____? Photo electrons Photo insulators Photo luminous All the above Hint 82). The study of photo electrons is related to ____ subject? Maths Physics Mechanics Both a and c Hint 83). An EM waves has ____ number of components? 1 2 3 4 Hint 84). A photo diode is a ____ device? RF PN EM All the above Hint 85). A photo diode is provided with ____ as input? Light Water Pressure All the above Hint 86). Which of the following are the elements of photo diode? Optical filter Lenses Container Both a and b Hint 87). A photo diode is a ___ device? Active Passive Source dependent Both b and c Hint 88). APD diode stands for? Avalanche Photo Diode Avalanche Pin Diode Available Photo Diode All the above Hint 89). ____ is defined as increase in power of input to output port? Gain Resistance Breakdown Both a and b Hint 90). Gain are classified in to ____ types? 2 4 5 3 Hint 91). A power gain of circuit is also called _____? Electric gain Voltage gain Current gain Resistive gain Hint 92). Avalanche breakdown is observed in ____ types of substances? Conductor Insulators Semiconductors Both b and c Hint 93). The impurity added to a semiconductor is called _____? Extrinsic semiconductor Intrinsic semiconductor Both a and b None of the above Hint Read more about Intrinsic Semiconductor. 94). The type of impurity substance added to a semiconductor is called _____? Extrinsic semiconductor Intrinsic semiconductor Both a and b None of the above Hint 95). i-type semiconductor is a _____? Intrinsic semiconductor Extrinsic semiconductor P-Type semiconductor N-Type semiconductor Hint 96). A i-type semiconductor is also called ____? Pure semiconductor Undoped semiconductor Doped semiconductor Both a and b Hint 97). A photo multiplier in Avalanche photo diode is provided with ____ input? Air Gas Light Water Hint 98). A photo multiplier in Avalanche photo diode generates ___ as output form? Light Electric signal Pressure All the above Hint 99). Which of the following are the types of Avalanche photo diode? Magnetic photo multiplier Silicon photo multiplier Electrostatic photo multiplier All the above Hint 100). A silicon based photo multiplier is ____ state device? Liquid Gas Solid Water Hint Time is Up! Time's up
