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Photodiode Question & Answers

June 17, 2022 By WatElectronics

This article lists 100 Photodiode MCQs for Engineering Students. All the Photodiode Questions & Answers given below include solutions and links to the relevant topic. This is helpful for users who are preparing for their exams and interviews, or professionals who would like to brush up on the fundamentals of the Photodiode.

The photodiode is also a PN junction diode, that has the ability to generate a current when the
junction is exposed to light or radiation. When reverse bias potential is applied to a diode then only a minority current will flow through the device and this current is known as a reverse current.

So, initially when the junction is not exposed to any type of radiation then only a minority current will flow through the device, and that current is known as a dark current. The dark current flows through the device in the absence of any type of radiation.

The minority carriers for the P side are electrons and for the N side are holes. The movement of minority carriers across the junction will generate a small reverse current and this reverse current is known as a dark current.

The advantages of photodiodes are it has low resistance, low noise, are lightweight, and have
a long life. The disadvantages of photodiode are it needs offset voltage depending on the temperature and it has very low sensitivity.

1). In which one of the following photodiodes, the signal to noise ratio is better?

Hint
2). What is the standard form of ASE?

Hint
3). Which one of the following used in holographic data storage?

Hint
4). The typical active area of photomultiplier tube is from ___________ mm diameter?

Hint
5). The spectral range of photo emissive (external photoelectric) devices is from ___________?

Hint
6). Which one of the following is an example for the photovoltaic detector?

Hint
7). The dark current in photovoltaic mode is _____________?

Hint
8). The figure shown below is a schematic diagram of __________ diode?

Avalanche Photodiode

Hint
9). The number of carriers generated per photon is known as __________ efficiency?

Hint
10). What is the standard from of APD?

Hint
11). The response time of avalanche photodiode is _____________ that of PIN photo diode?

Hint
12). The sensitivity range is from ____________ in Avalanche photodiode?

Hint
13). What is the standard form of PAPR?

Hint
14). Which one of the following is an example for the photoconductive detector?

Hint
15). Which one of the following effects was explained by Albert Einstein?

Hint
16). The reverse bias voltage in photoconductive mode will _____________ the dark current?

Hint
17). The ratio of current output divided by incident power is known as __________?

Hint
18). What is the standard form of UPS?

Hint
19). Which one of the following spectroscopies determines molar mass and branches?

Hint
20). The photodiodes are categorized into ______________ types?

Hint
21). The reverse bias voltage is from ____________ volts in Avalanche photodiode?

Hint
22). The ratio of peak power divided by average power is known as ____________ ratio?

Hint
23). The spectral range of internal photoelectric devices is from ___________?

Hint
24). Which one of the following is an example for the photo emissive detector?

Hint
25). Which one of the following is a low energy phenomenon?

Hint

Photodiode MCQs for Quiz

26). The response speed in photoconductive mode __________?

Hint
27). The figure shown below is a schematic diagram of __________ diode?

Schottky Barrier Photodiode

Hint
Read more about Schottky Diode
28). The ratio of output potential divided by input current is known as __________?

Hint
29). What is the standard form of PES?

Hint
30). In which one of the following photo diodes the sensitivity is high?

Hint
31). The wavelength region of avalanche photodiode is from ___________ nm?

Hint
32). The spectral range of thermal detector is from ___________ micro meters?

Hint
33). The response speed in photovoltaic operation mode __________?

Hint
34). The figure shown below is a circuit diagram of __________ mode?

Photovoltaic Mode

Hint
35). Which one of the following spectroscopies determines functional groups?

Hint
36). The electrical resistivity of silicon semiconductor is ___________ meters?

Hint
37). The melting point of silicon semiconductor material is ___________ degree Celsius?

Hint
38). The seventy-two is the standard atomic weight of ___________ material?

Hint
39). The energy gap is 1.21 at zero degrees kelvin in ___________ material?

Hint
40). Which one of the following photo diodes has poor temperature stability?

Hint
41). The conversion efficiency of avalanche photodiode is ___________ amps/watt?

Hint
42). What is the standard form of IM/DD?

Hint
43). The typical active area of photoconductive detector is from ___________ mm diameter?

Hint
44). What is the standard form of MCT material?

Hint
45). In how many modes does Shottky photodiode operates?

Hint
46). What are the advantages of photodiodes?

Hint
47). Who invented photodiode and in which year does the photodiode was introduced?

Hint
48). Which one of the following spectroscopies determines types of hydrogens present?

Hint
49). What is the standard form of XPS?

Hint
50). The high reverse bias is required in _____________ type of photo diode?

Hint

Photodiode MCQs for Students

51). The typical active area of thermocouple (thermopile) is from ___________ mm diameter?

Hint
52). Which one of the following is a mid-energy phenomenon?

Hint
53). What is the standard form of HgCdTe material?

Hint
54). The figure shown below is a circuit diagram of __________ mode?

Photoconductive Mode

Hint
55). What is the standard form of SNMS?

Hint
56). Which one of the following measures the absorbance of light?

Hint
57). In which one of the following meters the prism is used?

Hint
58). Which one of the following meter measures colour and intensity of colour through ligh t?

Hint
59). Which one of the following meters is more costly?

Hint
60). In which one of the following photodiodes the response time is more?

Hint
61). Which one of the following photo diodes is more expensive?

Hint
62). The typical active area of avalanche photodiode is from ___________ mm diameter?

Hint
63). What is the standard form of InGaAs material?

Hint
64). Which one of the following cables is used in the below figure?

Ultra Low Light Detection Circuit Using Optical Fiber

Hint
65). In which one of the following meters the accuracy is more?

Hint
66). Who invented silicon-controlled rectifier?

Hint
67). Which one of the following materials conducts electric current easily?

Hint
68). Which one of the following is an example for conductor?

Hint
69). Which one of the following spectroscopies uses radio waves?

Hint
70). In which one of the following photodiodes the external amplifier is not required?

Hint
71). The wavelength range of avalanche photodiodes is between ____________ micro meters?

Hint
72). The typical active area of bolometer or thermistor is from ___________ mm diameter?

Hint
73). The figure shown below is a schematic diagram of __________ mode?

Schematic of Si Photodiode

Hint
74). What is the standard form of RBS?

Hint
75). In which one of the following meters the spectral bandwidth is narrow band?

Hint

Photodiode MCQs for Interviews

76). Which one of the following is an example for semiconductor?

Hint
77). The relative mobility of widely used silicon semiconductor is ___________ cm^2/V-s?

Hint
78). What are the disadvantages of photodiodes?

Hint
79). Which one of the following spectroscopies uses infrared radiation?

Hint
80). Which one of the following photodiodes has high intensity electric field region?

Hint
81). The typical active area of pyroelectric is from ___________ mm diameter?

Hint
82). Which one of the following effects was explained by Arthur Compton?

Hint
83). The figure shown below is a symbol of __________ diode?

Photodiode Symbol

Hint
84). What is the standard form of InAsSb material?

Hint
85). In which year does the charge coupled devices was invented?

Hint
86). Which one of the following semiconductors has less relative mobility factor?

Hint
87). The speed of operation will be ___________ by using photodiodes?

Hint
88). What is the advantage of using PN junction diode?

Hint
89). The relative mobility of widely used germanium semiconductor is ___________ cm^2/V-s?

Hint
90). Which one of the following photodiodes has exhibit lower noise levels?

Hint
91). The figure shown below is a schematic diagram of __________ PN junction state?

Si photodiode PN Junction State

Hint
92). The relative mobility of widely used GaAs semiconductor is ___________ cm^2/V-s?

Hint
93). The electrical resistivity of germanium semiconductor is ___________ meters?

Hint
94). The melting point of germanium semiconductor material is ___________ degree Celsius?

Hint
95). The twenty-eight is the standard atomic weight of ___________ material?

Hint
96). The energy gap is 0.785 at zero degrees kelvin in ___________ material?

Hint
97). In which year the PN junction diodes was invented?

Hint
98). In which one of the following meters the spectral bandwidth is broad band?

Hint
99). Which one of the following cables is used in the below figure?

Hint
100). The typical active area of semiconductor photodiode is from ___________ mm diameter?

Hint
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