Transistor Biasing Question & AnswersJuly 6, 2021 By WatElectronics This article lists 100 Transistor Biasing MCQs for engineering students. All the Transistor Biasing Questions & Answers given below includes solution and link wherever possible to the relevant topic.Transistor's most common application is to perform amplification as the time-varying signals applied at the input terminals get amplified based on the external DC voltages applied. To achieve amplification, the transistor's input junction must be forward-biased and the junction at the output must be reversely biased. Faithful amplification's purpose is to achieve the signals with an increase in magnitude and without altering the shape of the signal.The process of applying external voltages at the junctions of the transistor is known as bias. This biasing makes the transistors operate in the required region. 1). The weaker signals are applied at the ________ of the transistor to amplify it.CollectorBaseEmitterAll the aboveHintWeaker signals are applied across the base as input 2). External __________ voltages are applied to bias a transistor.ACDCBoth AC or DCAnalogHintExternal DC voltages are applied 3). What are the conditions to achieve Faithful amplification?VBE must be at minimumVCE must be at minimumZero signal current at the collectora, b and cHintBase-emitter junction must be forward-biased 4). The flow of proper zero signal collector currents and the maintenance of the proper voltages at collector-emitter during the flow of signals is known as ________.Transistor biasingTransistor at cut-offTransistor at saturationUnbiased transistorHintBiased circuit 5). N-P-N transistor made of silicon with Vcc = 8V and the collector at load Rc = 1.4-kilo-ohms. Find the maximum of the current at the collector required to achieve amplification?3 mA4 mA5 mA6 m AHintTo achieve faithful amplification VCE for the transistor made of silicon must not be less than 1 Volts 6). Inherent variations in the parameters of transistors can change _______________.Operating pointBiasingAmplificationFilterationHintUnfaithful amplification 7). Operating point of a transistor must be independent of _____________.BiasingAmplificationVariations in parametersFilterationHintOperating point to maintain 8). What does operating point projects?Values of VBE and IcSignal’s magnitudeVCE and Ic values of zero signalsSignal’s frequencyHintIc and the VCE values of the zero signals 9). The current at the collector changes in a rapid manner due to ___________.Temperature changesInherent changes of parametersBoth a and bResistor connectedHintChange in parameters and the temperature 10). Amplifier circuit without biasing leads to _______.Decreasing base currentFaithful amplificationUnfaithful amplificationProper functioningHintExternal supply must be provided 11). A circuit provided with transistor biasing is known as ______.Biased circuitBias batteryBias diodeResistive circuitHintFaithful amplification 12). The process to make the operating point independent of changes in temperature and other variations are known as ______.BiasingStabilisationModulationRectificationHintStabilization of operating point 13). VBE for the silicon made transistor must be not lesser than __________ volts.Zero0.010.70.1HintSilicon-made transistor 14). To operate the transistor properly the collector must be ______.Forward biasReverse biasNeither forward nor reverseEither forward or reverseHintReversely biased for amplification 15). VCE for the transistor must not be less than __________ to obtain faithful amplification.Zero V0.01 V0.7 V1 VHintVoltage at the collector-emitter junction should not be lesser than 1 v 16). What is the necessity for stabilization?Temperature dependenceIndividual variationsThermal runawaya, b and cHintChanges in temperature and the other inherent variations 17). Which type of bias provides stabilization?Base-resistor biasCollector-feedback biasPotential-divider biasEmitter-feedback biasHintPotential-divider bias uses the external resistors 18). __________ are used to carry the excess heat.ResistorsHeat sinkBoth a and bTransistorsHintBase-emitter temperature 19). Self-destruction of the transistor is termed as _____________.StabilizationBiasingThermal RunawayAmplificationHintUnstabilized transistors undergo self-destruction 20). To maintain stability factor __________ must be constant.IcβIBBoth b and cHint β and IB both are maintained constant 21). The intersection point of DC and AC load line is referred to as __________.Operating pointBiasingAmplificationTransitionHintOperating point should be maintained constant 22). Operating point is also known as_______.Saturation pointQuiescent pointCut-off pointZero pointHintQ-point 23). What are the methods to bias a transistor?Potential-divider biasCollector-feedback biasBase-resistor biasa, b and cHintTransistor biasing for the BJTs 24). For a N-P-N transistor a resistor must be connected between base and ___________.Positive end of the supplyNegative end of the supplyCollectorEmitterHintBase and the positive end of the supply of the N-P-N transistor 25). For a P-N-P transistor a resistor must be connected between base and ___________.Positive end of the supplyNegative end of the supplyCollectorEmitterHintN-P-N and P-N-P transistors is the supply polarity at the inputTransistor Biasing MCQs for Exams 26). What is the ideal value of the stability factor?10020010HintStability factor will be zero 27). Stability factor of the Base-resistor method is _________.β+12 (β+1)β (β+1)3 (β+1)HintStability factor is large 28). Where will be the biasing point present to make the transistor to function as an amplifier?Cut-offActiveSaturationBoth a and cHintTransistor works as an amplifier in the active region 29). The operating point can be shifted anywhere in the active region in ________ method.Potential-divider biasCollector-feedback biasBase-resistor biasEmitter-feedback biasHintBy changing the RB value operating point can be placed anywhere 30). What can be the disadvantage of Base-resistor method?Complicated to designSensitive to the changes in βHigh stabilityMultiple components neededHintChange in β 31). Operating point is __________ in the Fixed bias.StableLinearUnstableCan’t sayHintOperating point unstable 32). Fixed bias is used in __________.Linear circuitsTransistor as current sourceSwitchingBoth a and bHintPoor stabilization 33). Stability factor is high in ___________.Potential-divider biasCollector-feedback biasBase-resistor biasEmitter-feedback biasHintThermal runaway 34). The fixed bias circuit can be modified by attaching another resistor externally at _____________ terminal of the transistor.CollectorEmitterBaseAnodeHint Emitter feedback bias uses negative feedback 35). The change in parameter β leads to change in __________ in fixed bias method.Zero signal current at emitterZero signal current at baseZero signal current at collectorZero signal current at CathodeHintChange in parameters and the current at the terminal collector 36). Q-point in the base bias method is dependent on ____________.βCollector currentEmitter currentResistorHintThe operating point is dependent upon β 37). Two sources of DC are used in ___________ bias circuit.CollectorEmitterBaseBoth a and cHintEmitter bias circuit in which one is negative and the other is positive 38). Zero signal current at the collector is _________ m Amps during the initial stage of transistor.4321HintIc must be maintained at unity 39). The change in temperature makes the Q-point to shift because of _________.Change in ICBOChange in VccChange in resistance values of the circuitChange in βHintICBO lead to the change in Q-point 40). One end of the resistor connected to the base and the other is connected to the collector in _________ feedback bias method.CollectorEmitterBaseBoth a and cHintCollector-feedback biasing method 41). Negative feedback in the collector-feedback bias reduces _________ of amplifier.StabilityCurrentVoltageGainHintGain reduction because of feedback 42). What is the most popular method of biasing?Potential-divider biasCollector-feedback biasBase-resistor biasData insufficientHintStability is concerned voltage-divider biasing 43). Stability in Voltage-divider is achieved due to ___________.RE in series with the emitterRE in series with the collectorRE in series with the baseRC in series with the emitterHintRE connected in series with the terminal emitter 44). The cause for thermal runaway is ________.Forward biased EmitterReverse biased CollectorHigh capacitance at junctionUnbiased transistorHintNo external Dc supplied to the transistor 45). In the voltage-divider circuit drop at the resistor R2 _________ the Base-Emitter junction.Forward biasesReverse biasesNeither forward nor reverseBoth a and bHintJunction Base-emitter forward biased 46). What is the disadvantage of Voltage-divider bias method?Lower base currentMultiple resistorsStability factor is highCan’t sayHintMultiple resistors are needed in the Potential –divider method 47). What are the advantages of Voltage-division biasing method?Single supply of DCQ-point independent of βQ-point stabilized for Temperature shiftsa, b and cHintIndependence on various inherent parameters 48). Which biasing method is used in Linear circuits?Potential-divider biasCollector-feedback biasBase-resistor biasEmitter-feedback biasHintPotential-divider bias due to its merits and highly stabilization 49). Q-point lying on the center of the DC load line of the amplifier circuit, these amplifiers are said to be __________.Fixed biasedCollector biasedMidpoint biasedBase biasedHintIc and VCE offers ‘one-half’ of their possible maximum values 50). _____________ amplifiers produce optimum outcomes.Fixed biasedCollector biasedMidpoint biasedBase biasedHintLarge possible outputs can be producedTransistor Biasing Important MCQs 51). ________ is used to compensate the voltages and currents and maintain operating point stable.Fixed biasedCollector biasedMidpoint biasedBias compensationHintBias compensation makes use of devices sensitive to temperature 52) . What are the devices used for bias compensation?DiodeThermistorTransistora, b, and cHintDiodes, Thermistors, and transistors are devices sensitive to temperature 53). Collector-base bias and the voltage-divider bias uses _________ feedback.PositiveNegativeZeroNeither positive nor negativeHintReduce the amplification of the signals 54). In the diode compensation method diode is connected at ____________ circuit.CollectorEmitterBaseResistorHintThe diode-connected at the base must possess the same characteristic of the transistor 55). Voltage-divider bias method is also known as __________.Fixed biasCollector biasMidpoint biasSelf biasHintSelf-bias requires more components 56). The change in VBE can be compensated by the changing the voltage across the diode in ________ methodDiode compensationTransistor compensationThermistor compensationResistor compensationHintTransistor and the diode characteristics must be the same 57). For compensating ICO saturation current at diode must be equal to ___________.Transistor saturation currentTransistor Leakage currentVoltage across the diodeVoltage across the transistorHintEquivalent to the leakage current at the transistor 58). Ic = β IB is possible in _____________ method.VBE diode compensationTransistor compensationThermistor compensationIco diode compensationHintIc = β IB 59). ___________ method requires fewer components.Fixed biasCollector biasMidpoint biasSelf biasHintFixed bias offers flexibility 60). Stability factor is dependent upon RB and RE in _______ method.Fixed biasCollector biasMidpoint biasSelf biasHintGreat stability is provided by the self-biasing method 61). ICBO gets doubled for every __________ degree C temperature rise.10203040HintFor every 10 degrees Celsius temperature rise ICBO tends to double 62). The rate of change in current at the collector to the Ico change is known as _____.Operating pointSaturation factorActive factorStabilization factorHintIB and β are maintained constant to stabilize the collector 63). Stability factor should be _______ to achieve stability.SmallMediumLargeMaximumHintSmall stability factor 64). The resistance in thermistor ____________ with ___________ in the temperature.Decreases, IncreaseDecreases, DecreaseIncreases, IncreaseIncreases, DecreaseHintTemperature in the biased circuit increases the Thermistor resistance decreases 65). Decrease in the resistance decreases VBE leads to decrease in ___________.IBIcICBONone of the aboveHintDecrease in the base current 66). The resistance in sensistor ___________ with __ in the temperature.Decreases, IncreaseDecreases, DecreaseIncreases, IncreaseIncreases, DecreaseHintThe temperature in the sensistor compensated circuit increases 67). In the Sensitor biasing compensation increase in the resistance leads to decrease in _______.IBVR2ICBoth b and cHintDecreases the emitter forward bias 68). Thermal runaway can be avoided by ______.Shifting the operating pointUnbiasing a transistorStabilizing the Operating pointBoth a and bHintOperating point independent of temperature and the other parameters 69). The transistor made up of silicon the rise in ICBO is for every ________________ degree C.10121416HintSilicon it rises for 12 degrees Celsius 70). What are the advantages of using Silicon over Germanium?Smaller ICBOWorking temperaturePIV rating is highAll the aboveHintSilicon-made devices don't get damaged easily 71). What is disadvantage of silicon made devices?Smaller ICBOWorking temperaturePIV rating is highPotential barrierHintHigher biasing voltage is required by the silicon-made devices 72). The germanium-made transistor operates at 25 degrees C. With ICBO 5 micro Amps, Zero signal Ic= 2 milli Amps and β = 40. Calculate the cut-off current at the collector?0.105 mA0.205 mA0.305 mA0.405 mAHint ICEO = (β+1) ICBO 73). The absence of resistor at the junction of base-emitter offers ___________ on the source in a fixed bias of base circuit.LoadResistanceNo loadBoth a and bHintThe absence of the resistor leads to no loading 74). Automatic control in gain can be achieved using _________ bias method.Fixed base biasCollector biasMidpoint biasSelf biasHintThe base-resistor method is used in switching 75). In the collector bias method the base and the collector voltages are _____________.DependentIndependentProportionalCan’t sayHintVB = VC - IBRBTransistor Biasing MCQs for Quiz 76). Collector bias method is also known as _____________ feedback.Self-biasSelf-biasing with NegativeSelf-biasing with PositiveNone of the aboveHintSelf-biasing circuit with Negative feedback 77). The reduction of current at base to decrease the current at the ____________ in collector bias.BaseEmitterCollectorJunctionHintThe reduced current at the terminal collector 78). The improvisation of collector biasing method is __________.Fixed base biasCollector biasMidpoint biasDual feedback biasHintConnecting an additional resistor to the collector 79). _________ biases the junction of Base-Emitter in the emitter bias.VEEVBBVCCVBEHintBase-emitter junction forward biased 80). _________ biases the junction of Collector-base in the emitter bias.VEEVBBVCCVBEHintCollector-base reversely biased 81). Self-emitter bias has _______ and _____feedbacks.Collector-baseEmitterCollector-EmitterBoth and bHintEmitter and the Collector-base feedbacks are employed 82). Output gain is reduced in Self-emitter bias is due to ________ feedback.PositiveNegativeDegenerativeRegenerativeHintUnwanted feedback of AC leads to a reduction in the gain 83). The gain reduced in self-bias emitter can be compensated using __________.InductorResistorDiodeBy-pass capacitorHintBy-pass capacitor to overcome the gain reduced 84). In voltage-divider biasing the voltage at R2 is considered as the _______ voltage.BaseEmitterCollectorJunctionHintBase voltage of the transistor 85). The value of IC can be restored to original by decreasing ___________.Base currentEmitter currentCollector currentJunction currentHintDecreasing the base currents 86). BJTs can be biased using ________________.Active networksPassive networksSilicon or Zener diodesBoth a and cHintActive networks as well as Zener and the silicon diodes 87). Transistor can be operated linearly due to __________.BiasingInductorDiodeBy-pass capacitorHintBiasing makes the transistor 88). Straight line drawn about the output characteristics of transistor is known as _________.AC load lineDC load lineLoad lineNone of the aboveHintLoad line 89). AC signal applied to the transistor_______ and _______ tends to vary.Voltage, CurrentPower, VoltageCurrent, PowerResistance, VoltageHintAC signal is applied Current and the Voltage tends to vary 90). Load line drawn when both the external voltages of DC and the input signals are applied is known as ____________-.AC load lineDC load lineLoad lineNone of the aboveHintLoad line of AC 91). How can you differentiate between AC and DC load lines?Only external DC appliedOnly input signal appliedBoth External DC voltage and input signal appliedNone of the aboveHintApplied signals of the input and the external DC applied 92). At _____________ the current and the voltage parameters of both sections match.Active pointSaturation pointBiasing pointPoint of concurrenceHintThe intersecting point of the AC and DC load lineRead More About Transistor Biasing 93). Due to collector is reversely biased the transistor offers high ___________.Input impedanceOutput impedanceInput CapacitanceJunction capacitanceHintImpedance at the output is high 94).For a transistor to function as amplifier the DC load is _________than that of AC load.Same asLesserMoreCan’t sayHintDC load must be higher than that of AC load 95). To establish the operating point correctly __________ is needed.Selection of proper biasing resistorsProper Load resistors selectionAppropriate current at inputAll the aboveHintSelecting the proper load and the bias resistors and providing appropriate currents and voltages 96). Automatic biasing and the feedback by resistors is provided in ________ method.Fixed base biasCollector biasMidpoint biasDual feedback biasHintDual feedback biasing mechanism offers automatic feedback 97). __________feedback can be used for Low Power supply Voltages.Fixed baseCollectorEmitterDual feedbackHintEmitter feedback circuit can be used in Low Power supply Voltages 98). Distortion free output of amplifier is produced by ________.Proper biasingOperating point operate in active regionOperating point operate in saturation regionBoth a and bHintProperly biasing to make the transistor operate in the active region 99). Transistor biased circuit must be ____________.SimpleEasy to implementCost-effectiveAll the aboveHintCost-effective and simple to understand and implement 100). What is the difference between Sensistor and Thermistor bias compensation?Negative temperature coefficientPositive temperature coefficientBoth a and bOperating pointHintSensistor has a positive coefficient of temperature Time is Up!