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Silicon Controlled Rectifier Question & Answers

May 31, 2021 By WatElectronics

This article lists 100+ Silicon Controlled Rectifier MCQs for engineering students. All the Silicon Controlled Rectifier 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 Silicon Controlled Rectifier topic.

SCR is abbreviated as Silicon controlled rectifier, is a semiconductor device and also called thyristor which includes 4 layers namely p-n-p-n, 3 junctions J1, J2, J3, and 3 terminals namely, anode, cathode, and gate.

SCR was invented by Frank W and Gordon Hall and its principle was developed by Goldey, Tanenbaum, Holonyak, and Moll in 1956. These devices are implemented in devices where high voltage and power control are used. It operates in 3 modes as Reverse blocking type mode, Forwards conduction type mode, and Forward blocking type mode.

A few of the applications of SCR are a switch battery charger, controls motor speed, and power converters.

1). SCR is abbreviated as _________.

Hint
Read more about Silicon Controlled Rectifier.
2). Silicon controlled rectifier (SCR) is also called as _________.

Hint
3). SCR has ________ layers.

Hint
4). SCR principle was developed by _________.

Hint
5). SCR principle was developed by Goldey, Tanenbaum, Holonyak, and Moll in which year?

Hint
6). SCR principles practical demonstration was presented by which of the following scientist?

Hint
7). SCR is a _______ type of device.

Hint
8). A thyristor is a _______ type of switch.

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9). SCR was invented by which scientist?

Hint
10). SCR has _______ number of terminals.

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11). An Anode is _______ polarity.

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12). A Cathode is ________ polarity.

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13). SCR has _______ junctions.

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14). SCR is _______ directional type device.

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15). SCR is a unidirectional type device, means it conducts in a _______ direction.

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16). In how modes can a SCR operate?

Hint
17). Which of the following are the modes of SCR?

Hint
18). The 3 modes of SCR can be represented in _______ forms.

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19). Forward blocking mode is also called as _______ state.

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20). Forward conduction type mode is also called as _______ state.

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21). Reverse blocking type mode is also called as _______ state.

Hint
22). Forward conduction type mode, anode terminal is connected to ______ type voltage source.

Hint
23). Forward conduction type mode, cathode terminal is connected to _______ type voltage source.

Hint
24). In forward conduction type mode, the gate terminal is connected to ______ type voltage source.

Hint
25). Which of the following junctions in SCR forward conduction type mode are forward biased?

Hint

Silicon Controlled Rectifier MCQs for Interviews

26). Which of the following junctions in SCR Forward conduction type mode are reverse biased?

Hint
27). A small leakage current in SCR Forward conduction type mode flows in _______ direction.

Hint
28). If input voltage at J2 in SCR Forward conduction type mode increases to break overvalue, then J2 becomes ______.

Hint
29). Does the J2 in SCR Forward conduction type mode start conducting after avalanche breakdown?

Hint
Read more about Avalanche Breakdown.
30). What is the resistance of J2 in SCR Forward conduction type mode before avalanche breakdown?

Hint
31). SCR in forward conduction type mode switches from blocking mode type to ______ mode.

Hint
32). SCR in forward conduction type mode, switches from blocking mode type to conduction type mode by applying ______ type of pulses to gate terminal.

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33). When gate voltage is applied to an SCR in forward conduction type mode does SCR switches its state?

Hint
34). The process of passing minimum amount of current to SCR in forward conduction type mode to maintain in ON state is called ___current.

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35). In how many ways can a SCR in forward conduction type mode can be turned off?

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36). Which are the 2 ways an SCR in forward conduction type mode can be turned off?

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37). SCR in forward conduction type mode can turned off by reducing value of current below minimum value is called _______.

Hint
38). SCR in the reverse blocking mode type anode is supplied with _______ voltage.

Hint
39). SCR in the reverse blocking mode type cathode is supplied with _______ voltage.

Hint
40). Which of the following junctions in SCR in reverse blocking mode type are reverse biased?

Hint
41). J1, J2, J3 is represented as _________ in SCR.

Hint
42). Which of the following junctions in SCR in forward blocking mode type are reverse biased?

Hint
43). SCR reverse blocking mode type has _______ number of reverse bias diodes.

Hint
44). The amount of leakage current in SCR reverse blocking mode flow is ________.

Hint
45). When reverse type voltage is increased at a critical breakdown in SCR reverse blocking, the mode is called ______.

Hint
46). Reverse breakdown voltage in SCR reverse blocking mode is represented as ________.

Hint
47). Reverse breakdown voltage in SCR reverse blocking mode avalanche occurs at _______ junctions.

Hint
48). In SCR reverse blocking mode, reverse type current value ________.

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49). SCR reverse blocking mode adds up with _______ voltage drop.

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50). Which of the following is true for SCR reverse blocking mode that adds up with forward type voltage drop?

Hint

Silicon Controlled Rectifier Important Questions for Interviews

51). Which of the following is the application of reverse blocking type SCR?

Hint
52). The process that does not block reverse SCR voltage is called ________.

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53). ASCR in reverse blocking type SCR is abbreviated as __________.

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54). ASCR in reverse blocking type has a ________ breakdown rating.

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55). ASCR in the reverse blocking type has reverse breakdown rating of ________ volts.

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56). ASCR is fabricated with ______ type of conducting diode in reverse blocking type SCR.

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57). RCT in reverse blocking type SCR is abbreviated as _________.

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58). ________ are also called reverse conducting type thyristor.

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59). How many methods are there to turn on a thyristor?

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60). Which of the following are the methods to turn on a thyristor?

Hint
61). At what condition does forward voltage triggering method in SCR begin?

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62). Which junction in the forward voltage triggering method in SCR breaks down?

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63). When the J2 junction in forward voltage triggering method in SCR breaks down it is called _______ condition.

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64). At what voltage state in forward voltage triggering method in SCR changes from avalanche breakdown?

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65). At sufficient voltage state in forward voltage triggering method in SCR changes from avalanche breakdown with _______.

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66). Which of the following junctions in forward voltage triggering method in SCR are forward biased?

Hint
67). Gate triggering in thyristor occurs during ________ blocking state.

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68). Gate triggering in thyristor has gate voltage ______ than breakdown voltage.

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69). A condition where the width of the depletion region decreases when temperature rises is called _______.

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70). Which junction triggers SCR in the temperature triggering method?

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71). SCR circuit contains which of the following components?

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72). SCR circuit on input side has _________ component.

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73). SCR circuit on output side has ________ component.

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74). Initially before applying any pulse to SCR, SCR remains in ________ state.

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75). The delay angle in SCR is represented as ________.

Hint

Silicon Controlled Rectifier MCQs With Answers

76). At what condition does SCR turn off?

Hint
77). At what condition is SCR current zero.

Hint
78). SCR is applied in the digital devices with ________ properties.

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79). SCR operation with high voltage and power properties are suitable in which of the following applications?

Hint
80). Which of the following behaves similar to SCR?

Hint
81). SCS is abbreviated as _________.

Hint
82). What is the main difference between SCR and SCS?

Hint
83). SCS uses ________ number of control pulses.

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84). Which of the following are the applications of SCS?

Hint
85). TRIAC as SCR acts as ________ controlled switches.

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86). Which of the following are the home applications of SCR?

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87). Which of the following are the industrial applications of SCR?

Hint
88). Which of the following is the most important application of SCR?

Hint
89). SCR switch circuit contains how many components?

Hint
90). Which of the following component does the SCR switch circuit protect the diodes from high voltage?

Hint
Read more about Diodes.
91). In the SCR switch circuit at what condition current flows through diode and SCR?

Hint
92). During positive half cycle in an SCR switch circuit current flows to load via _______.

Hint
93). In a negative half cycle of an SCR switch, the circuit SCR2 component is ______ biased.

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94). In a negative half cycle of an SCR switch, the circuit SCR1 component is _______ biased.

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95). SCR switch circuit can handle current in the ________ range.

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96). SCR switch circuit benefits which of the following switching branch?

Hint
97). Can an SCR control the power within the circuit?

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98). On which factor does SCR in power control applications depend?

Hint
99). Which of the following is controlled in SCR AC circuits?

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100). What is the input given to AC SCR circuit?

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101). SCR in AC SCR circuit is connected in _________ fashion.

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102). Which of the following is varied in SCR AC application circuit?

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103). The advantage of the SCR circuit is __________.

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104). SCR V-I characteristics is plotted with ___ on X axis and __ on y axis?

Hint
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