Transistor Biasing Question & Answers July 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. Collector Base Emitter All the above None Hint 2). External __________ voltages are applied to bias a transistor. AC DC Both AC or DC Analog None Hint 3). What are the conditions to achieve Faithful amplification? VBE must be at minimum VCE must be at minimum Zero signal current at the collector a, b and c None Hint 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 biasing Transistor at cut-off Transistor at saturation Unbiased transistor None Hint 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 mA 4 mA 5 mA 6 m A None Hint 6). Inherent variations in the parameters of transistors can change _______________. Operating point Biasing Amplification Filteration None Hint 7). Operating point of a transistor must be independent of _____________. Biasing Amplification Variations in parameters Filteration None Hint 8). What does operating point projects? Values of VBE and Ic Signal’s magnitude VCE and Ic values of zero signals Signal’s frequency None Hint 9). The current at the collector changes in a rapid manner due to ___________. Temperature changes Inherent changes of parameters Both a and b Resistor connected None Hint 10). Amplifier circuit without biasing leads to _______. Decreasing base current Faithful amplification Unfaithful amplification Proper functioning None Hint 11). A circuit provided with transistor biasing is known as ______. Biased circuit Bias battery Bias diode Resistive circuit None Hint 12). The process to make the operating point independent of changes in temperature and other variations are known as ______. Biasing Stabilisation Modulation Rectification None Hint 13). VBE for the silicon made transistor must be not lesser than __________ volts. Zero 0.01 0.7 0.1 None Hint 14). To operate the transistor properly the collector must be ______. Forward bias Reverse bias Neither forward nor reverse Either forward or reverse None Hint 15). VCE for the transistor must not be less than __________ to obtain faithful amplification. Zero V 0.01 V 0.7 V 1 V None Hint 16). What is the necessity for stabilization? Temperature dependence Individual variations Thermal runaway a, b and c None Hint 17). Which type of bias provides stabilization? Base-resistor bias Collector-feedback bias Potential-divider bias Emitter-feedback bias None Hint 18). __________ are used to carry the excess heat. Resistors Heat sink Both a and b Transistors None Hint 19). Self-destruction of the transistor is termed as _____________. Stabilization Biasing Thermal Runaway Amplification None Hint 20). To maintain stability factor __________ must be constant. Ic β IB Both b and c None Hint 21). The intersection point of DC and AC load line is referred to as __________. Operating point Biasing Amplification Transition None Hint 22). Operating point is also known as_______. Saturation point Quiescent point Cut-off point Zero point None Hint 23). What are the methods to bias a transistor? Potential-divider bias Collector-feedback bias Base-resistor bias a, b and c None Hint 24). For a N-P-N transistor a resistor must be connected between base and ___________. Positive end of the supply Negative end of the supply Collector Emitter None Hint 25). For a P-N-P transistor a resistor must be connected between base and ___________. Positive end of the supply Negative end of the supply Collector Emitter None Hint Transistor Biasing MCQs for Exams 26). What is the ideal value of the stability factor? 100 200 1 0 None Hint 27). Stability factor of the Base-resistor method is _________. β+1 2 (β+1) β (β+1) 3 (β+1) None Hint 28). Where will be the biasing point present to make the transistor to function as an amplifier? Cut-off Active Saturation Both a and c None Hint 29). The operating point can be shifted anywhere in the active region in ________ method. Potential-divider bias Collector-feedback bias Base-resistor bias Emitter-feedback bias None Hint 30). What can be the disadvantage of Base-resistor method? Complicated to design Sensitive to the changes in β High stability Multiple components needed None Hint 31). Operating point is __________ in the Fixed bias. Stable Linear Unstable Can’t say None Hint 32). Fixed bias is used in __________. Linear circuits Transistor as current source Switching Both a and b None Hint 33). Stability factor is high in ___________. Potential-divider bias Collector-feedback bias Base-resistor bias Emitter-feedback bias None Hint 34). The fixed bias circuit can be modified by attaching another resistor externally at _____________ terminal of the transistor. Collector Emitter Base Anode None Hint 35). The change in parameter β leads to change in __________ in fixed bias method. Zero signal current at emitter Zero signal current at base Zero signal current at collector Zero signal current at Cathode None Hint 36). Q-point in the base bias method is dependent on ____________. β Collector current Emitter current Resistor None Hint 37). Two sources of DC are used in ___________ bias circuit. Collector Emitter Base Both a and c None Hint 38). Zero signal current at the collector is _________ m Amps during the initial stage of transistor. 4 3 2 1 None Hint 39). The change in temperature makes the Q-point to shift because of _________. Change in ICBO Change in Vcc Change in resistance values of the circuit Change in β None Hint 40). One end of the resistor connected to the base and the other is connected to the collector in _________ feedback bias method. Collector Emitter Base Both a and c None Hint 41). Negative feedback in the collector-feedback bias reduces _________ of amplifier. Stability Current Voltage Gain None Hint 42). What is the most popular method of biasing? Potential-divider bias Collector-feedback bias Base-resistor bias Data insufficient None Hint 43). Stability in Voltage-divider is achieved due to ___________. RE in series with the emitter RE in series with the collector RE in series with the base RC in series with the emitter None Hint 44). The cause for thermal runaway is ________. Forward biased Emitter Reverse biased Collector High capacitance at junction Unbiased transistor None Hint 45). In the voltage-divider circuit drop at the resistor R2 _________ the Base-Emitter junction. Forward biases Reverse biases Neither forward nor reverse Both a and b None Hint 46). What is the disadvantage of Voltage-divider bias method? Lower base current Multiple resistors Stability factor is high Can’t say None Hint 47). What are the advantages of Voltage-division biasing method? Single supply of DC Q-point independent of β Q-point stabilized for Temperature shifts a, b and c None Hint 48). Which biasing method is used in Linear circuits? Potential-divider bias Collector-feedback bias Base-resistor bias Emitter-feedback bias None Hint 49). Q-point lying on the center of the DC load line of the amplifier circuit, these amplifiers are said to be __________. Fixed biased Collector biased Midpoint biased Base biased None Hint 50). _____________ amplifiers produce optimum outcomes. Fixed biased Collector biased Midpoint biased Base biased None Hint Transistor Biasing Important MCQs 51). ________ is used to compensate the voltages and currents and maintain operating point stable. Fixed biased Collector biased Midpoint biased Bias compensation None Hint 52) . What are the devices used for bias compensation? Diode Thermistor Transistor a, b, and c None Hint 53). Collector-base bias and the voltage-divider bias uses _________ feedback. Positive Negative Zero Neither positive nor negative None Hint 54). In the diode compensation method diode is connected at ____________ circuit. Collector Emitter Base Resistor None Hint 55). Voltage-divider bias method is also known as __________. Fixed bias Collector bias Midpoint bias Self bias None Hint 56). The change in VBE can be compensated by the changing the voltage across the diode in ________ method Diode compensation Transistor compensation Thermistor compensation Resistor compensation None Hint 57). For compensating ICO saturation current at diode must be equal to ___________. Transistor saturation current Transistor Leakage current Voltage across the diode Voltage across the transistor None Hint 58). Ic = β IB is possible in _____________ method. VBE diode compensation Transistor compensation Thermistor compensation Ico diode compensation None Hint 59). ___________ method requires fewer components. Fixed bias Collector bias Midpoint bias Self bias None Hint 60). Stability factor is dependent upon RB and RE in _______ method. Fixed bias Collector bias Midpoint bias Self bias None Hint 61). ICBO gets doubled for every __________ degree C temperature rise. 10 20 30 40 None Hint 62). The rate of change in current at the collector to the Ico change is known as _____. Operating point Saturation factor Active factor Stabilization factor None Hint 63). Stability factor should be _______ to achieve stability. Small Medium Large Maximum None Hint 64). The resistance in thermistor ____________ with ___________ in the temperature. Decreases, Increase Decreases, Decrease Increases, Increase Increases, Decrease None Hint 65). Decrease in the resistance decreases VBE leads to decrease in ___________. IB Ic ICBO None of the above None Hint 66). The resistance in sensistor ___________ with __ in the temperature. Decreases, Increase Decreases, Decrease Increases, Increase Increases, Decrease None Hint 67). In the Sensitor biasing compensation increase in the resistance leads to decrease in _______. IB VR2 IC Both b and c None Hint 68). Thermal runaway can be avoided by ______. Shifting the operating point Unbiasing a transistor Stabilizing the Operating point Both a and b None Hint 69). The transistor made up of silicon the rise in ICBO is for every ________________ degree C. 10 12 14 16 None Hint 70). What are the advantages of using Silicon over Germanium? Smaller ICBO Working temperature PIV rating is high All the above None Hint 71). What is disadvantage of silicon made devices? Smaller ICBO Working temperature PIV rating is high Potential barrier None Hint 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 mA 0.205 mA 0.305 mA 0.405 mA None Hint 73). The absence of resistor at the junction of base-emitter offers ___________ on the source in a fixed bias of base circuit. Load Resistance No load Both a and b None Hint 74). Automatic control in gain can be achieved using _________ bias method. Fixed base bias Collector bias Midpoint bias Self bias None Hint 75). In the collector bias method the base and the collector voltages are _____________. Dependent Independent Proportional Can’t say None Hint Transistor Biasing MCQs for Quiz 76). Collector bias method is also known as _____________ feedback. Self-bias Self-biasing with Negative Self-biasing with Positive None of the above None Hint 77). The reduction of current at base to decrease the current at the ____________ in collector bias. Base Emitter Collector Junction None Hint 78). The improvisation of collector biasing method is __________. Fixed base bias Collector bias Midpoint bias Dual feedback bias None Hint 79). _________ biases the junction of Base-Emitter in the emitter bias. VEE VBB VCC VBE None Hint 80). _________ biases the junction of Collector-base in the emitter bias. VEE VBB VCC VBE None Hint 81). Self-emitter bias has _______ and _____feedbacks. Collector-base Emitter Collector-Emitter Both and b None Hint 82). Output gain is reduced in Self-emitter bias is due to ________ feedback. Positive Negative Degenerative Regenerative None Hint 83). The gain reduced in self-bias emitter can be compensated using __________. Inductor Resistor Diode By-pass capacitor None Hint 84). In voltage-divider biasing the voltage at R2 is considered as the _______ voltage. Base Emitter Collector Junction None Hint 85). The value of IC can be restored to original by decreasing ___________. Base current Emitter current Collector current Junction current None Hint 86). BJTs can be biased using ________________. Active networks Passive networks Silicon or Zener diodes Both a and c None Hint 87). Transistor can be operated linearly due to __________. Biasing Inductor Diode By-pass capacitor None Hint 88). Straight line drawn about the output characteristics of transistor is known as _________. AC load line DC load line Load line None of the above None Hint 89). AC signal applied to the transistor_______ and _______ tends to vary. Voltage, Current Power, Voltage Current, Power Resistance, Voltage None Hint 90). Load line drawn when both the external voltages of DC and the input signals are applied is known as ____________-. AC load line DC load line Load line None of the above None Hint 91). How can you differentiate between AC and DC load lines? Only external DC applied Only input signal applied Both External DC voltage and input signal applied None of the above None Hint 92). At _____________ the current and the voltage parameters of both sections match. Active point Saturation point Biasing point Point of concurrence None Hint Read More About Transistor Biasing 93). Due to collector is reversely biased the transistor offers high ___________. Input impedance Output impedance Input Capacitance Junction capacitance None Hint 94).For a transistor to function as amplifier the DC load is _________than that of AC load. Same as Lesser More Can’t say None Hint 95). To establish the operating point correctly __________ is needed. Selection of proper biasing resistors Proper Load resistors selection Appropriate current at input All the above None Hint 96). Automatic biasing and the feedback by resistors is provided in ________ method. Fixed base bias Collector bias Midpoint bias Dual feedback bias None Hint 97). __________feedback can be used for Low Power supply Voltages. Fixed base Collector Emitter Dual feedback None Hint 98). Distortion free output of amplifier is produced by ________. Proper biasing Operating point operate in active region Operating point operate in saturation region Both a and b None Hint 99). Transistor biased circuit must be ____________. Simple Easy to implement Cost-effective All the above None Hint 100). What is the difference between Sensistor and Thermistor bias compensation? Negative temperature coefficient Positive temperature coefficient Both a and b Operating point None Hint Time's up
