Avalanche Photodiode Question & AnswersFebruary 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 HintMaximum value.2). An Avalanche Photo diode is designed with ____ substance? Conductor Semiconductor Insulator All the above HintP-type and N-type devices.3). Which of the following scientist discovered Avalanche Photo diode? Jun-ichi Charles Denis Richard Harry HintJapanese scientist has discovered Avalanche Photo diode.4). Which of the following are the typical applications of Avalanche Photo diode? Laser range finders Fiber optics Quantum sensing All the above Hint3 applications.5). Which of the following are the current applications of Avalanche Photo diode? Positron emission tomography Practical physics Telecommunication Both a and b Hint2 applications.6). Which of the following is the principle of operation of Avalanche Photo diode? Photo electric effect Quantum theory EM theory All the above HintDepends on light as input.7). Which of the following is the input signal form to a Avalanche Photo diode? Optical Electrical Mechanical All the above HintOperating in or employing the visible part of the electromagnetic spectrum.8). Which of the following is the output signal obtained form to Avalanche Photo diode? Optical Electrical Mechanical All the above HintTransformer.9). A Avalanche Photo diode operates in ____ bias condition? High reverse High forward Low reverse Low forward HintWider junction.10). The representation of a Avalanche Photo diode is similar to ____ diode? PIN diode Zener diode PN diode Varactor diode HintA diode operating in reverse bias.11). Identify the following diode.Diode Avalanche photodiode PN diode Varactor Diode Both a and b HintDepends on light.12). How many terminals do a avalanche photodiode comprises of? 1 2 3 4 HintEven number.13). A avalanche photodiode has ___ number of heavily doped regions? 1 2 3 4 HintEven number.14). A avalanche photodiode has ___ number of lightly doped regions? 1 2 3 4 HintMinimum number.15). Which of the following are the heavily doped regions in avalanche photodiode? P+ N+ I Both a and b Hint2 regions.16). Which of the following are the lightly doped regions in avalanche photodiode? P N+ I Both a and c Hint2 regions.17). How many layers do a avalanche photodiode comprises of? 3 4 5 6 HintEven number.18). The width of depletion layer in intrinsic region is ______ with respect to PIN photodiode? Thick Thin Wide Large HintMinimum width.19). Which of the following acts as anode in Avalanche photodiode? N+ P+ P I HintHoles as majority carriers.20). Which of the following acts as cathode in Avalanche photodiode? N+ P+ P I HintElectrons as majority carriers.21). Avalanche photodiode works in ______ bias condition? Forward Reverse Both a and b Zero bias HintWider width.22). In reverse bias condition the diode negative terminal is connected to _____ terminal of battery? Negative Positive Open circuited Both a and c HintNon inverting.23). In reverse bias condition the diode positive terminal is connected to _____ terminal of battery? Negative Positive Open circuited Both a and c HintInverting terminal.24). The gain of Avalanche photodiode is _____? 0 1 ¼ High HintMaximum value.25). At ___ voltage Avalanche photodiode experiences Avalanche breakdown? Forward bias Reverse bias Zero bias Open circuited HintWider junction.Avalanche Photodiode Interview Questions and Answers26). The electric field in Avalanche photodiode exceeds ____ region? Active Saturation Depletion Both b and c HintA region in a P-N junction diode where no mobile charge carriers are present.27). Light in Avalanche photodiode is incident on ____ region? P+ N+ I P HintHoles as majority carriers.28). Which of the following region in Avalanche photodiode absorbs light incident? P+ N+ I P HintHoles as majority carriers.29). Which of the following region in Avalanche photodiode has high resistive capacity? P+ N+ I P HintHoles as majority carriers.30). In which of the following region of Avalanche photodiode electron-hole pairs are generated? P+ N+ I P HintHoles as majority carriers.31). A P-type has majority as ____ charge carriers? Electrons Holes Neutrons All the above HintPositive carrier.32). A N-type has majority as ____ charge carriers? Electrons Holes Neutrons All the above HintNegative charge.33). At what velocity value charge carriers collide in Avalanche photodiode? Zero High Low Constant HintMaximum value.34). _____ result in generation of photo current in Avalanche photodiode? Electrons Holes Neutrons Both a and b HintNegative charge.35). In which of the following region Avalanche photodiode operates? Active Saturation Depletion All the above HintA region in a P-N junction diode where no mobile charge carriers are present.36). Which of the following is the additional mode of operation of Avalanche photodiode? Geiger Linear Avalanche mode Active Both a and b Hint2 modes.37). An Avalanche photo diode experience _____ type of breakdown? Zener Avalanche PN PIN HintStandard diode.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 HintRatio of terms.39). Identify the type of diodes characteristics below?Graph PN Zener PIN Avalanche photo HintNegative resistance diode.40). A Avalanche photo diode characteristics is plotted in _____ dimensions? 1 2 3 4 HintEven number.41). Which of the following parameters are used while plotting Avalanche photo diode characteristics? VI IR RV IVR Hint2 parameters.42). Which of the following parameter is plotted on X-axis of Avalanche photo diode? V I R T HintMeasured in volts.43). Which of the following parameter is plotted on Y-axis of Avalanche photo diode? V I R T HintMeasured in Amperes.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 Hint2 parameters.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 HintNegative polarity.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 HintSum of terms.47). The value of quantum efficiency is _____ for perfect SNR value? Low High Zero Constant HintMaximum value. Read more about SNR.48). The speed of operation factor of Avalanche photo diode is _____? Low High Zero Constant HintMaximum value.49). Avalanche photo diode calculates ___ range of light? Low High Zero Constant HintMinimum value.50). A Avalanche photo diode is designed using _____ materials? Silicon InGaAs Fe Both a and b Hint2 components.Avalanche Photodiode MCQs for Exams51). The performance of Avalanche photo diode depends on ____ parameter? Efficiency Light absorbed Light emitted Power dissipated HintOutput generated.52). The value of noise in Avalanche photo diode is ____? High Low Zero Constant HintMaximum value.53). The silicon substance gain in Avalanche photo diode is ___? High Low Zero Constant HintMaximum value.54). The silicon substance noise in Avalanche photo diode is ___? High Low Zero Constant HintMinimum value.55). ____ is defined as function of width of depletion to carrier drift velocity? Carrier transit time Carrier speed time Depletion speed All the above HintThe width of the depletion region and v is the velocity of the charge carrier.56). The value of capacitance in Avalanche photo diode must be____? Increased Minimized Zero Constant HintLower value.57). At which condition the value of capacitance in Avalanche photo diode must be minimized? Higher sensitivity High speed Low noise All the above Hint3 reasons.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 HintRatio of terms.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 HintSum of terms.60). Which of the following Bandwidth of Avalanche photo diode? B=1/2πRC B=1+2πRC B=1-2πRC B=1/πRC HintRatio of terms.61). Which of the following are the advantages of Avalanche photo diode? High gain High sensitivity Enhance speed All the above Hint3 advantages.62). Which of the following are the demerits of Avalanche photo diode? High input voltage High noise Non linear output All the above Hint3 disadvantages.63). A PIN diode has ___ layers compared to Avalanche photo diode? 2 3 4 5 HintOdd number.64). The response time in Avalanche photo diode is _______? High Low Zero Constant HintMaximum value.65). The output current in Avalanche photo diode is _______? High Low Zero Constant HintMinimum value.66). The response time in PIN diode compared to Avalanche photo diode is _______? High Low Zero Constant HintMinimum value.67). The output current in PIN diode compared to Avalanche photo diode is _______? High Low Zero Constant HintMaximum value.68). Which of the following is the internal gain value of Avalanche photo diode? 100dB 200dB 300dB 400dB HintMinimum value.69). dB stands for ___? Decibels Decimals Decoders Dividers HintUnit for expressing the ratio between two physical quantities, usually amounts of acoustic or electric power.70). The internal gain value of Pin diode compared to Avalanche photo diode is_____? 100dB Constant Insignificant 0 HintUncertain.71). The sensitivity of Pin diode compared to Avalanche photo diode is ____? High Low Zero Constant HintMinimum value.72). The noise factor of Pin diode compared to Avalanche photo diode is ____? High Low Zero Constant HintMinimum value.73). The reverse bias based voltage of Pin diode compared to Avalanche photo diode is ____? High Low Zero Constant Hintminimum number.74). A Avalanche photo diode has ____ value of temperature stability? High Low Zero Constant HintMaximum value.75). A Pin diode compared to Avalanche photo diode has ____ value of temperature stability? High Low Zero Constant HintMinimum value. Read more about Temperature.Avalanche Photodiode Quiz Questions and Answers.76). Temperature is measured in terms of ____? Farads Centigrade Bits/seconds Amperes HintThermometric scale.77). Which of the following component is not necessary in Avalanche photo diode? Amplifier Capacitor Resistor Battery HintAn electronic device that can increase the power of a signal.78). Which of the following component is necessary in Pin diode compared to Avalanche photo diode? Amplifier Capacitor Resistor Battery HintAn electronic device that can increase the power of a signal.79). Photo electric effect emits ___ carriers? Holes Electrons Neutrons All the above HintNegative polarity.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 HintLight based effect.81). Electrons emitted due to EM waves are ____? Photo electrons Photo insulators Photo luminous All the above HintInverting polarity.82). The study of photo electrons is related to ____ subject? Maths Physics Mechanics Both a and c HintReal time subject.83). An EM waves has ____ number of components? 1 2 3 4 HintEven number.84). A photo diode is a ____ device? RF PN EM All the above HintStandard diode.85). A photo diode is provided with ____ as input? Light Water Pressure All the above HintLuminous energy.86). Which of the following are the elements of photo diode? Optical filter Lenses Container Both a and b Hint2 elements.87). A photo diode is a ___ device? Active Passive Source dependent Both b and c Hint2 names.88). APD diode stands for? Avalanche Photo Diode Avalanche Pin Diode Available Photo Diode All the above HintConverts light into electricity.89). ____ is defined as increase in power of input to output port? Gain Resistance Breakdown Both a and b HintMeasures in dB.90). Gain are classified in to ____ types? 2 4 5 3 HintOdd number.91). A power gain of circuit is also called _____? Electric gain Voltage gain Current gain Resistive gain HintMeasures in volts or amperes.92). Avalanche breakdown is observed in ____ types of substances? Conductor Insulators Semiconductors Both b and c HintNegative resistance diode.93). The impurity added to a semiconductor is called _____? Extrinsic semiconductor Intrinsic semiconductor Both a and b None of the above HintSi, Ge. 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 HintAntimony (Sb) and Arsenic (As).95). i-type semiconductor is a _____? Intrinsic semiconductor Extrinsic semiconductor P-Type semiconductor N-Type semiconductor HintSi, Ge.96). A i-type semiconductor is also called ____? Pure semiconductor Undoped semiconductor Doped semiconductor Both a and b Hint2 names97). A photo multiplier in Avalanche photo diode is provided with ____ input? Air Gas Light Water HintLuminous energy.98). A photo multiplier in Avalanche photo diode generates ___ as output form? Light Electric signal Pressure All the above Hint0's and 1's.99). Which of the following are the types of Avalanche photo diode? Magnetic photo multiplier Silicon photo multiplier Electrostatic photo multiplier All the above HintContains north and south poles.100). A silicon based photo multiplier is ____ state device? Liquid Gas Solid Water HintA three dimensions. Time is Up! Time's up
