Semiconductor Diode Question & AnswersJune 5, 2021 By WatElectronics This article lists 100+ Semiconductor Diode MCQs for engineering students. All the Semiconductor Diode Questions & Answers given below include a hint and wherever possible link to the relevant topic. This is helpful for the users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the Semiconductor Diode topic.To understand the functionality of any electronic device, it is important to analyze the construction and the material present in it. Based on conduction, the materials are classified as conductors, insulators, and semiconductors. The electric conductivity of semiconductors lies in between insulators and conductors and it is considered to be the essential block of any electronic device.A diode made up of semiconductors is the basic device used today. Examples of semiconductor diodes are PN junction diode, Zener diode, Schottky diode, Tunnel diode, and so on. There are various areas of applications of diode including communication systems, computer systems, and power systems, and so on.1). Diode is made up of ____________ material. Conducting Insulating Semiconducting Electronic Hintsemiconductor diode2). Semiconductors are classified as _________________. Intrinsic semiconductors Extrinsic semiconductors Both a & b None of the above HintAddition of impurities and the pure form of material3). Diode is a ______ device. Unidirectional Bidirectional Non-linear Both a and c HintSingle direction4). If the applied voltage polarity matches the polarity of diode then it gets turn _______. ON OFF Fluctuate Can’t say HintForward biased5). Diode turns OFF if the applied voltage polarity is ________ to the diode polarity. Similar Matches Same Opposite HintReverse biased6). The junction formed amid anode and cathode in a PN semiconductor diode is ________. Substrate Emission layer Region of convergence Depletion region HintRegion initially doesn't consist of any holes or electrons7). What happens to the diode when the positive voltages are applied at anode? Diode gets forward biased Diode begin to conduct Depletion region becomes smaller All the above HintDiodes are forward biased8). Semiconductors used in the electronic devices construction are _____________. Silicon Germanium Gallium Arsenide All the above HintFrequently and the commonly used9). ___________ semiconductor is less temperature sensitive. Silicon Germanium Gallium Arsenide All the above HintMaterial abundantly available on earth10). ____________ material is the expensive one. Silicon Germanium Gallium Arsenide All the above HintGallium arsenide offers to speed up to five times more than that silicon11). Temperature and conductivity are directly proportional in __________. Conductors Semiconductors Insulators None of the above HintConductivity tends to decrease with the increase in temperature in conductors12). Semiconductor undergoing the process of doping are classified as __________. Intrinsic semiconductors Extrinsic semiconductors Both a & b None of the above HintAdding impurities to the material13). What type of impurities are chosen for doping to form n-type semiconductor? Trivalent Tetravalent Pentavalent Both a and c HintN-type semiconductors14). How many electrons are present in the valence shell of trivalent impurities? Two Three Four Five HintTrivalent impurities15). The application of external voltage to the terminals of diode is termed as _________. Scattering Photon Bias Diffusion HintForward bias and reverse bias16). The majority carrier concentration in N-type material is ____________. Electron Hole Photon Neutron HintMajority concentration of carrier in an N-type material17). _____________ carriers are formed due to doping. Majority Minority Moderate Both a and b HintCarriers18). Saturation current in the diode is caused due to _____________ carriers. Majority Minority Moderate All the above HintMinority carriers19). Unidirectional behavior of the diode is termed as ________________. Amplification Rectification Modulation Synchronization HintConversion of alternating current into direct current20). The cut in or the Knee voltage of the silicon diode is ___________. 0.5 V 0.7 V 0.8 V 1.0 V HintForward drop21). Which diode has the barrier potential of 1.2 Volts? Silicon Germanium Gallium Arsenide None of the above HintGallium Arsenide made diodes are used when the speed is a major concern22). The maximum forward current carried by a diode for an indefinite time is ____________. Forward voltage drop Average forward current Maximum power dissipation None of the above HintAverage value of the forward current diode23). __________ is the maximum reverse potential that a diode can withstand. Forward voltage drop Average forward current Maximum power dissipation Peak reverse voltage HintExceptional for Zener diode24). What are the common reasons of failure in diode? Excess forward current Reverse breakdown voltage Power dissipation Both a & b HintForwarding currents and the reverse breakdown potential25). ___________ are used to convert AC into DC. Rectifier diodes Switching diodes Tunnel diodes Varactor diodes HintApplications concerning power supply Semiconductor Diode Multiple Choice Question and Answers26). ________ possess low power ratings in comparison to rectifiers. Schottky diodes Switching diodes Tunnel diodes Varactor diodes HintHigh-frequency application27). How many diodes a half wave rectifier has? One Two Three Four HintHalf wave rectifier comprises a single diode28). Half power is wasted in __________ rectifiers? Half wave Full wave Both a and b None of the above HintFull-wave rectifiers are designed29). ____________ rectifier consists of center-tapped transformer. Half wave Full wave Both a and b None of the above HintFull-wave rectifiers comprise two diodes30). Bridge of four resistors can function as a normal _______________. Antenna Amplifier Transformer Rectifier HintBridge31). The potential drop in full wave bridge rectifier is ______. 1.1 V 1.2 V 1.3 V 1.4 V HintTwo diodes crossed in the full-wave circuit32). The output generated from the rectifier is _________. Filtered Rippled Distorted Scattered HintRectifier output is passed through the filter33). ____________ are used as filters. Resistors Capacitors Inductors Both b and c HintInductors and capacitors used for smoothening34). Voltage Generator is an application of _________. Rectifier diodes Switching diodes Tunnel diodes Varactor diodes HintMultiple rectifiers35). __________ comes under the category of switching diodes. Clippers Amplifiers Clampers Both a and c Hint Clippers and clampers36). _______ cut down the certain part of the input wave. Clippers Amplifiers Clampers Both a and c HintTo clip a certain part of applied input wave37). Desired DC level as the outcome can be achieved by _______. Clippers Amplifiers Clampers Both a and c HintRestore DC38). _________ is connected at the supply source in the clamper circuit to obtain desired outcome. Resistors Capacitors Inductors Both b and c Hint Capacitors are connected in series with the applied input source39). Time constant RC is smaller in __________. Clippers Amplifiers Clampers Both a and c HintDiode's small internal resistor40). Clippers are also known as ______________. Limiters Slicers Amplitude selectors All the above HintDefined level of reference41). Half wave rectifier is an example of ____________. Clippers Amplifiers Clampers Both a and c HintRectifier either allows positive part or the negative part42). ________________ can clip negative and the positive cycles of the signal simultaneously. Serial biased clippers Amplifiers Clampers Parallel biased clippers HintTwo diodes placed in the directions opposite to each other43). ____________ are known as DC restorers. Clippers Amplifiers Clampers Both a and c HintClamped capacitors44). PN junction in Zener diode is _______ doped. Lightly Heavily Moderately None of the above HintPN junction of Zener diode is doped heavily45). Increase in the addition of impurities will __________ the Zener potential. Increase Decrease Neither increase nor decrease Cannot say HintVarying the doping levels46). Point contact diodes offer __________. Low capacitance High forward resistance Greater reverse leakages All the above HintCrystal detector technology47). In PN junction diode, the high levels of electric potential is applied at ____________. Anode Cathode P-side Both a and c HintP-side of the PN junction is represented as Anode48). _____________ has the metal-semiconductor junction. Rectifier diodes Switching diodes Tunnel diodes Schottky diodes HintMetal-semiconductor junction49). CCD stands for ______________. Charge coupled device Charge constant device Capacitor coupled device Capacitance charged device HintPhotodiodes are spaced closely in an array format50). Which are the diodes conduct in reverse direction? Zener diode Avalanche diode PN diodes Both a and b HintAvalanche and Zener51). What are the distinct mechanisms of P-N junction breakdown? Avalanche Breakdown Zener Breakdown Both a and b Either a or b HintTwo distinct mechanisms52). _______ breakdown occurs due to the ionization effect of hole and electron pairs. Avalanche Breakdown Zener Breakdown Both a and b Either a or b HintPN junction is in reverse biasing mode53). Zener breakdown is occurred due to ___________. Ionization of hole and electron pairs Heavy doping Width of depletion region is thin Both b and c HintHeavily doped P-N junction54). In ________ diodes gate is shorted to the terminal source. Zener Avalanche PN Constant-current HintJFETs in which the gate terminal is shorted55). Point contact diodes are ___________. Zener diodes Crystal diodes PN diodes Constant-current diodes HintCrystal technology56). Diodes formed using semiconductors possessing direct band gaps are known as ______. Light emitting diodes Crystal diodes PN diodes Constant-current diodes HintSuccessive recombination57). __________ are used in optical communication to achieve high speed. Light emitting diodes Crystal diodes LASER diodes Constant-current diodes HintOptical storage purpose58). Temperature can be monitored using ___________ diodes. Light emitting diodes Thermal diodes LASER diodes Photodiodes Hint Forward voltages59). _________ converts the light energy into electric current. Light emitting diodes Thermal diodes LASER diodes Photodiodes HintPhotodiode resembles a P-N junction diode60). LEDs generate light only when they are _________ biased. Forward Reverse Neutral Ideal HintElectrically forward biased61). The intensity of emitted light from LED is dependent upon the __________ flow. Voltage Current Rays Photon HintMovement of charged particles62). Gallium phosphate emits _________ light. Red Green Yellow Both a and b HintGaP emits two different colors63). The leakage current in photodiode in presence of light ________. Increases Decreases Negligible Can be ignored HintLight is absent the leakage current goes negligible64). Photodiode and LED are combined together to form _________. Zener diode Avalanche diode PN diodes Optocoupler HintEmitted light gets hit to the photodiode65). _____________ diodes are used in Power electronics. Light emitting diodes PIN diodes LASER diodes Photodiodes HintCapable of standing high voltages66).Doping concentration in the crystal diode and the breakdown is ________. Directly proportional Inversely proportional Either increase or decrease Cannot say HintBreakdown in the crystal diode can be decreased67). The Reverse Saturation Current in the diode made of silicon gets doubled for every _______ degree Centigrade. 5 10 15 20 HintTemperature rises for each 10-degree centigrade68). For the reverse voltages applied to the diode, it will ______________. Raise the barrier potential Lowers the barrier potential Increases the majority carrier concentration None of the above HintBarrier potential69). When the diode is in ideal condition and forward biased it behaves as ________. Conductor Insulator Resistor None of the above HintDiode behavior resembles the conductor70). The forward current in the semiconductor diode is due to __________. Majority carriers Minority carriers Resistance Capacitance at junction HintMajority of carriers71). Leakage current in the semiconductor diode is contributed by _______-. Majority carriers Minority carriers Resistance Capacitance at junction HintMinority carrier concentration72). Temperature and the leakage current of semiconductor diode are _______ to each other. Directly proportional Inversely proportional Either increase or decrease Cannot say HintTemperature in the diode increases the leakage current also increases73). Zener diode is a _______ device. Linear Amplifying Non-linear Both a and c HintP-N junction diodes74). Diodes are ___________ devices. Voltage dependent Current dependent Linear None of the above HintLEDs75). To control current through LED ________ is placed in series. Resistor Inductor Capacitor Ammeter HintResistor is placed in seriesSemiconductor Diode Interview Questions with Answers76). Visible-light LEDs are _________. Inexpensive Durable Expensive Both a and b HintIndicators77). Photodiode response time _________ as the surface area increases. Speed up Slows Increases Cannot determine Hint Photodiodes are sensitive78). The P-side in the photodiode is a ________. Anode Cathode Neutral Voltage source HintThin n-type semiconductor79). The intensity of input light in a photodiode and the current at output are _________. Linear Amplifying Non-linear Both a and c HintIntensity of the light is dependent upon the current generated80). __________ are photodiodes with larger areas of surfaces. Solar cells Avalanche photodiode PIN diode Schottky photodiode Hint Solar cells with a large surface area81). Zener diode is a _______ device. Unidirectional Non-Linear Bidirectional Both b and c HintConduct during reverse bias and in forwarding biasconduct during reverse bias and in forwarding bias82). _________ diode is suited as Amplifiers. Rectifier diodes Switching diodes Tunnel diodes Varactor diodes HintTunnel diodes can be used as Microwave amplifiers83). Materials used in tunnel diode manufacturing are ___________. Silicon Germanium Zinc Both a and b HintTunnel diode has fast transitions84). _________ is known as a Transferred Electron Device. Light emitting diode PIN diode LASER diodes Gunn diode HintGunn diodes operate with negative resistance85). ________ consists of only N-type semiconductor material. Light emitting diode PIN diode LASER diodes Gunn diode HintGunn diodes only have N-type semiconductor material86). The characteristic curve of the diode shows the relation between _____________. Current and Voltage Voltage and Resistance Voltage and Power Resistance and Temperature HintCurrents and voltages of the diode87). ___________ in the Schottky diode is replaced by the metal. Anode Cathode Both a and b Resistor HintP-type semiconductor88). Which impurity is chosen for the conversion of intrinsic to p-type extrinsic silicon? Aluminum Germanium Zinc Arsenic HintTrivalent impurities89). AM demodulation performed by using _________ diodes. Light emitting diode Schottky diode LASER diodes Gunn diode HintSmaller amplitude waves of AM90). Diodes characteristics for high frequency applications are ___________. Low junction capacitance Short reverse recovery time Fast transitions All the above HintConducting mode91). Small signal diodes are classified as ____________. Fast diodes Very fast diodes Ultra fast diodes Both a and c HintSpeed of switching92). Example of ultra fast diodes is _________. Light emitting diode Schottky diode LASER diodes Gunn diode HintReverse recovery time93). White light contains multiple wavelengths or frequencies makes it difficult to concentrate or focus at a single point leads to _____________. Scattering Diffusion Total Internal Reflection Chromatic aberration HintA lens with a fixed focal length focusing on different wavelengths of color94). Chromatic aberration can be overcome by using __________. Light emitting diode Schottky diode LASER diodes Gunn diode HintLASER light consists of a single frequency95). Which diode used the intrinsic layer of semiconductor amid P ad N layers? Light emitting diode PIN diode LASER diodes Gunn diode HintPIN photodiode is sometimes lightly doped or Undoped N-type96). Diodes can be tested using __________. Ammeter Voltmeter Multi meter None of the above HintMultimeters can be analog or digital97). __________ class of LASER requires a protective eye wear. Class 1 Class 1M Class 3R Class 3B HintHigh-power laser pulsed about 500 mW98). __________ class of LASER can cause permanent eye damage. Class 3R Class 1M Class 2 Class 4 HintVarious medical, scientific, military, and industrial fields99). LASER diode module is ________ circuit. Self-regulating Non-regulating Self-mixing Both a and c HintLASER diode module can sense the self light100). __________ LASERs are used in DVD and CD players. Low power High power Both a and b None of the above HintFamiliar applications Read More About Semiconductor Diode Time is Up! Time's up
