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Transistor Biasing Question & Answers

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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.
HintWeaker signals are applied across the base as input
2). External __________ voltages are applied to bias a transistor.
HintExternal DC voltages are applied
3). What are the conditions to achieve Faithful amplification?
HintBase-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 ________.
HintBiased 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?
HintTo 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 _______________.
HintUnfaithful amplification
7). Operating point of a transistor must be independent of _____________.
HintOperating point to maintain
8). What does operating point projects?
HintIc and the VCE values of the zero signals
9). The current at the collector changes in a rapid manner due to ___________.
HintChange in parameters and the temperature
10). Amplifier circuit without biasing leads to _______.
HintExternal supply must be provided
11). A circuit provided with transistor biasing is known as ______.
HintFaithful amplification
12). The process to make the operating point independent of changes in temperature and other variations are known as ______.
HintStabilization of operating point
13). VBE for the silicon made transistor must be not lesser than __________ volts.
HintSilicon-made transistor
14). To operate the transistor properly the collector must be ______.
HintReversely biased for amplification
15). VCE for the transistor must not be less than __________ to obtain faithful amplification.
HintVoltage at the collector-emitter junction should not be lesser than 1 v
16). What is the necessity for stabilization?
HintChanges in temperature and the other inherent variations
17). Which type of bias provides stabilization?
HintPotential-divider bias uses the external resistors
18). __________ are used to carry the excess heat.
HintBase-emitter temperature
19). Self-destruction of the transistor is termed as _____________.
HintUnstabilized transistors undergo self-destruction
20). To maintain stability factor __________ must be constant.
Hint β and IB both are maintained constant
21). The intersection point of DC and AC load line is referred to as __________.
HintOperating point should be maintained constant
22). Operating point is also known as_______.
HintQ-point
23). What are the methods to bias a transistor?
HintTransistor biasing for the BJTs
24). For a N-P-N transistor a resistor must be connected between base and ___________.
HintBase 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 ___________.
HintN-P-N and P-N-P transistors is the supply polarity at the input

Transistor Biasing MCQs for Exams

26). What is the ideal value of the stability factor?
HintStability factor will be zero
27). Stability factor of the Base-resistor method is _________.
HintStability factor is large
28). Where will be the biasing point present to make the transistor to function as an amplifier?
HintTransistor works as an amplifier in the active region
29). The operating point can be shifted anywhere in the active region in ________ method.
HintBy changing the RB value operating point can be placed anywhere
30). What can be the disadvantage of Base-resistor method?
HintChange in β
31). Operating point is __________ in the Fixed bias.
HintOperating point unstable
32). Fixed bias is used in __________.
HintPoor stabilization
33). Stability factor is high in ___________.
HintThermal runaway
34). The fixed bias circuit can be modified by attaching another resistor externally at _____________ terminal of the transistor.
Hint Emitter feedback bias uses negative feedback
35). The change in parameter β leads to change in __________ in fixed bias method.
HintChange in parameters and the current at the terminal collector
36). Q-point in the base bias method is dependent on ____________.
HintThe operating point is dependent upon β
37). Two sources of DC are used in ___________ bias circuit.
HintEmitter 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.
HintIc must be maintained at unity
39). The change in temperature makes the Q-point to shift because of _________.
HintICBO 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.
HintCollector-feedback biasing method
41). Negative feedback in the collector-feedback bias reduces _________ of amplifier.
HintGain reduction because of feedback
42). What is the most popular method of biasing?
HintStability is concerned voltage-divider biasing
43). Stability in Voltage-divider is achieved due to ___________.
HintRE connected in series with the terminal emitter
44). The cause for thermal runaway is ________.
HintNo external Dc supplied to the transistor
45). In the voltage-divider circuit drop at the resistor R2 _________ the Base-Emitter junction.
HintJunction Base-emitter forward biased
46). What is the disadvantage of Voltage-divider bias method?
HintMultiple resistors are needed in the Potential –divider method
47). What are the advantages of Voltage-division biasing method?
HintIndependence on various inherent parameters
48). Which biasing method is used in Linear circuits?
HintPotential-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 __________.
HintIc and VCE offers ‘one-half’ of their possible maximum values
50). _____________ amplifiers produce optimum outcomes.
HintLarge possible outputs can be produced

Transistor Biasing Important MCQs

51). ________ is used to compensate the voltages and currents and maintain operating point stable.
HintBias compensation makes use of devices sensitive to temperature
52) . What are the devices used for bias compensation?
HintDiodes, Thermistors, and transistors are devices sensitive to temperature
53). Collector-base bias and the voltage-divider bias uses _________ feedback.
HintReduce the amplification of the signals
54). In the diode compensation method diode is connected at ____________ circuit.
HintThe diode-connected at the base must possess the same characteristic of the transistor
55). Voltage-divider bias method is also known as __________.
HintSelf-bias requires more components
56). The change in VBE can be compensated by the changing the voltage across the diode in ________ method
HintTransistor and the diode characteristics must be the same
57). For compensating ICO saturation current at diode must be equal to ___________.
HintEquivalent to the leakage current at the transistor
58). Ic = β IB is possible in _____________ method.
HintIc = β IB
59). ___________ method requires fewer components.
HintFixed bias offers flexibility
60). Stability factor is dependent upon RB and RE in _______ method.
HintGreat stability is provided by the self-biasing method
61). ICBO gets doubled for every __________ degree C temperature rise.
HintFor 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 _____.
HintIB and β are maintained constant to stabilize the collector
63). Stability factor should be _______ to achieve stability.
HintSmall stability factor
64). The resistance in thermistor ____________ with ___________ in the temperature.
HintTemperature in the biased circuit increases the Thermistor resistance decreases
65). Decrease in the resistance decreases VBE leads to decrease in ___________.
HintDecrease in the base current
66). The resistance in sensistor ___________ with __ in the temperature.
HintThe temperature in the sensistor compensated circuit increases
67). In the Sensitor biasing compensation increase in the resistance leads to decrease in _______.
HintDecreases the emitter forward bias
68). Thermal runaway can be avoided by ______.
HintOperating point independent of temperature and the other parameters
69). The transistor made up of silicon the rise in ICBO is for every ________________ degree C.
HintSilicon it rises for 12 degrees Celsius
70). What are the advantages of using Silicon over Germanium?
HintSilicon-made devices don't get damaged easily
71). What is disadvantage of silicon made devices?
HintHigher 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?
Hint 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.
HintThe absence of the resistor leads to no loading
74). Automatic control in gain can be achieved using _________ bias method.
HintThe base-resistor method is used in switching
75). In the collector bias method the base and the collector voltages are _____________.
HintVB = VC - IBRB

Transistor Biasing MCQs for Quiz

76). Collector bias method is also known as _____________ feedback.
HintSelf-biasing circuit with Negative feedback
77). The reduction of current at base to decrease the current at the ____________ in collector bias.
HintThe reduced current at the terminal collector
78). The improvisation of collector biasing method is __________.
HintConnecting an additional resistor to the collector
79). _________ biases the junction of Base-Emitter in the emitter bias.
HintBase-emitter junction forward biased
80). _________ biases the junction of Collector-base in the emitter bias.
HintCollector-base reversely biased
81). Self-emitter bias has _______ and _____feedbacks.
HintEmitter and the Collector-base feedbacks are employed
82). Output gain is reduced in Self-emitter bias is due to ________ feedback.
HintUnwanted feedback of AC leads to a reduction in the gain
83). The gain reduced in self-bias emitter can be compensated using __________.
HintBy-pass capacitor to overcome the gain reduced
84). In voltage-divider biasing the voltage at R2 is considered as the _______ voltage.
HintBase voltage of the transistor
85). The value of IC can be restored to original by decreasing ___________.
HintDecreasing the base currents
86). BJTs can be biased using ________________.
HintActive networks as well as Zener and the silicon diodes
87). Transistor can be operated linearly due to __________.
HintBiasing makes the transistor
88). Straight line drawn about the output characteristics of transistor is known as _________.
HintLoad line
89). AC signal applied to the transistor_______ and _______ tends to vary.
HintAC 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 ____________-.
HintLoad line of AC
91). How can you differentiate between AC and DC load lines?
HintApplied signals of the input and the external DC applied
92). At _____________ the current and the voltage parameters of both sections match.
HintThe intersecting point of the AC and DC load line

Read More About Transistor Biasing

93). Due to collector is reversely biased the transistor offers high ___________.
HintImpedance at the output is high
94).For a transistor to function as amplifier the DC load is _________than that of AC load.
HintDC load must be higher than that of AC load
95). To establish the operating point correctly __________ is needed.
HintSelecting 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.
HintDual feedback biasing mechanism offers automatic feedback
97). __________feedback can be used for Low Power supply Voltages.
HintEmitter feedback circuit can be used in Low Power supply Voltages
98). Distortion free output of amplifier is produced by ________.
HintProperly biasing to make the transistor operate in the active region
99). Transistor biased circuit must be ____________.
HintCost-effective and simple to understand and implement
100). What is the difference between Sensistor and Thermistor bias compensation?
HintSensistor has a positive coefficient of temperature

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