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Transistors Question & Answers

November 29, 2021 By WatElectronics

This article lists 100 Transistors MCQs for engineering students. All Transistors Questions & Answers given below include a hint and wherever possible link 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 the Transistors topic which is core in Electronics & Electrical Engineering.

In most electrical and electronic devices, transistors play a key role. Transistors were developed in 1947 by three American physicists namely Walter Brattain, William Shockley & John Bardeen. So transistors are considered as one of the most essential inventions within science history.

Transistors are semiconductor devices that can be used for conducting as well as insulating electric voltage or current. So, they can be used as an amplifier and a switch to control otherwise regulate the electronic signal flow.

The NPN and PNP transistors both are bipolar transistors that have two junctions. The emitter and collector of an NPN transistor are made up of N-type semiconductors, and the base is made up of P-type semiconductors whereas the base of PNP transistors is made up of N-type semiconductors.

The emitter and collector of a PNP transistor are made up of a P-type semiconductor. When the BJT is used for the amplification of the signal then it can be operated in an active region. In a BJT common emitter configuration, the emitter terminal is common between input and output. In three regions BJT can operate are active, cut-off, and saturation regions.

The bipolar junction transistor is categorized into two types they are NPN and PNP transistors. In a bipolar junction transistor, the gain is characterized by the voltage gain, the terminals are not interchangeable and the emitter is heavily doped.

1). The transistors are divided broadly into ….types?

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2). The minority concentration of transistor under open circuit condition is-------?

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3). In the active region the emitter-base junction is --------biased and base-collector junction is---------biased?

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4). Due to forward biasing of emitter-base junction ----------are induced into the base?

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5). The heavily doped region of the transistor is-----?

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6). The collector current IC and emitter current IE have---?

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7). Sign of the emitter current in positive in---?

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8). In the active region, collector current depends upon----?

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9). The technique used for manufacturing of transistors---?

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10). When the base region is common to both input and output circuits, the configuration is called-----?

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11). The width of the depletion region -------------with the magnitude of the reverse voltage?

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12). According to Early effect the effective base width changes due to--------?

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13). During the punch-through phenomenon, the effective base width is--------?

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14). The voltage level below which the emitter current is very small is called------?

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15). In common base configuration, the region where both emitter and collector junctions are forward biased is known as----?

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16). In common-emitter configuration the independent variables are----?

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17). The dependent variables in the common-emitter configuration are---?

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18). In common emitter configuration, the input characteristics, when collector shorted to emitter and emitter is forward biased are similar to---?

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19). The reverse collector saturation current ICBO of common emitter configuration----------for every 100C increase in temperature?

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20). The generalized transistor expression, when reverse saturation current ICO and VC are given?

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21). When voltage amplification is greater than unity the transistor acts as?

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22). In common base configuration, the output voltage is ----?

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23). In common base configuration, the input voltage VEB is the function of?

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24). The approximate threshold voltage Vγ values for germanium and silicon transistors are….respectively.?

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25). When input voltage VEB is constant, the increase in collector voltage causes Emitter current to-----?

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Transistors MCQs for Exams

26). When IE = 0 , the collector current IC =?

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27). For p-n-p transistor Ic and Ico are---?

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28). The large signal current gain α of a common base transistor, when collector current IC= ICO and emitter current IE = 0 are given------

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29). In common emitter configuration, if current gain β is defined as β=α/(1-α) the collector current is given as?

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30). In common collector configuration, the input current is?

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31). Transistors are formed by the back-to-back connection of?

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32). Commonly used transistor configuration is?

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Please refer to this link to know more about Transistor Configuration
33). Based on the usage in a circuit, transistors are classified into…types?

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34). What is a transistor?

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35). A transistor has ….PN junctions?

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36). How many depletion layers are there in a transistor?

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37). The doping of a transistor can be done…..?

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38). The large size of the terminal in a transistor is…?

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39). In PNP, the majority charge carriers are?

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40). In NPN, the majority charge carriers are?

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41). What is the full form of BJT?

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Please refer to this link to know more about Bipolar Junction Transistor
42). The material used to made a transistor is?

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43). The purpose of transistor biasing in an amplifier circuit is….?

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44). The transistor’s input impedance is…?

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45). Which of the following is correct in a transistor?

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46). The output impedance of a transistor is…..?

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47). If a DC current gain of a NPN transistor (Beta) value is 200 and calculate the IB value necessary for switching a 4mA of switching load?

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48). If a NPN transistor has base voltage (Vb) is 10V, Rb is 100 kilo ohms, calculate the base current?

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49). Which of the following configuration is used in most of the transistors?

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50). In which of the following configuration is used highest to connect the transistor’s input impedance?

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Transistors MCQs for Interviews

51). In which of the following is used highest to connect the transistor’s output impedance?

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52). In a CB configuration, the phase difference among the i/p & o/p voltages is…?

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53). When the transistor’s temperature increases then the resistance at BE terminal…?

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54). In CC configuration, the value of connected voltage gain is…?

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55). BC147 transistor is made with …material?

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56). The signal in a transistor is transferred from …resistance to …?

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57). The function of heat sink in a transistor is…?

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58). The operation of transistors in a digital circuit is in …region?

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59). When the current ratio IC/IE<1, then it is known as….?

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60). The function of emitter resistor in a CE configuration is…?

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61). Which of the following transistors are square law devices?

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62). The FET provides….?

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63). The transistor name is derived from….?

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64). The bandwidth gain of FET with respect to BJT is….?

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65). The collector current in a transistor can be controlled through…?

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66). If a 3mV signal generates a 3V output, then calculate the voltage gain.?

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67). The current ratio of a beta is…?

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68). A transistor can be used like a switching device or…?

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Please refer to this link to know more about  Transistor as a Switch
69). If the alpha value is 0.5 then what is the beta value?

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70). Junction transistors are called as…?

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71). Which of the following transistors are current controlled devices?

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72). BJTs operate in …regions?

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73). Which of the following transistor is a voltage controlled devices?

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74). Which of the following transistor is used as a switch, resistor and amplifier?

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75). Insulated Gate FET is a….?

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Transistors MCQs for Quiz

77). The light sensitive transistors are?

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78). Field effect transistor includes…terminals?

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79). Which of the following transistor is known as unipolar transistor?

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80). The input impedance of JFET is…?

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Please refer to this link to know more about Junction Field Effect Transistor
81). Thermal stability of BJT is…?

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82). In a CB configuration, IE = 1mA, IC = 0.25mA then what will be the IB value?

Transistor Configuration

Transistor Configuration

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83). Identify the following transistor…?

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84). Identify the following transistor's symbol.

FET Symbol

FET Symbol

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85). In high frequency applications, which of the following transistor is used?

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86). Which of the following transistors are used in high speed ICs?

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87). Which of the following transistors contain metal part of the MOSFET?

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88). Which transistors work on quantum tunneling principle?

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89). ISFET stands for?

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90). The transistor used in environmental monitoring & biomedicine field is?

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91). The transistor which uses the quantum tunneling principle is?

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92). The double gate transistors are?

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93). What is the full form of the HEMT?

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94). Schottky Transistor is also called as?

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95). Trench-structure based transistor is?

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96). In which of the transistor, nitrate oxide is used as insulating layer?

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97). Which of the following transistor has fast turn-off capacity?

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98). Which of the device is used to test a transistor?

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99). In which year, Shockley launched the improved BJT?

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100). In analog & digital circuits, which of the transistor is used?

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