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Phototransistor Question & Answers

June 18, 2022 By WatElectronics

This article lists 100 Phototransistors MCQs for engineering students. All the Phototransistors Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Phototransistors.

The phototransistor is a bipolar or unipolar transistor. It is capable of converting light energy into electrical energy. It has a large base and collector width which is made using diffusion or ion implantation.

Phototransistors available in both PNP and NPN types have different configurations like emitter, collector, and base. The device is activated once the light strikes the base terminal by allowing electron-hole pair configuration.

They are available in two types: BJT and FET phototransistors. The output of a phototransistor depends on the wavelength of incident light. A phototransistor is more sensitive compared to a photodiode.

Modes of operation are two types: Switch and Active modes. Switch mode works in the ON/OFF System. Active mode is also called linear which is proportional to light stimuli. Applications of phototransistors are counting, security systems, encoders, and light controls.

Phototransistors depend on different parameters like Collector current, base current, dark current, peak wavelength, power dissipation, rise time, and fall time. Output response is very low. Available at low costs and relatively inexpensive.

1). Phototransistor is a form of _____ transistor which is sensitive to light.
HintRelating to two poles.
2). Phototransistor which changes the ____ flowing between emitter and collector.
HintStream of charged particles such as electrons.
3). Phototransistors and ______ are used for sensing light.
HintMore complex than PN diode.
4). Phototransistor is more _____ to gain from bipolar transistors.
HintWhich is quick to detect.
5). Phototransistors are ____ used in several applications?
HintA large interval in between.
6). Phototransistors are a form of the bipolar transistor which are ______ for light sensitivity.
7). Phototransistor is a very _____ electronic component available in the markets.
HintWhich is of little worth.
8). Phototransistor development has been undertaken by _____?
HintScientific development company.
9). When the light touches the phototransistor the current ___ into the base region.
HintThe passage of something.
10). Phototransistors are operated in _____ regions.
HintWhich represents ready to engage.
11). When light enters the base region of a phototransistor it generates an ________pair?
HintThe presence of two types of charge carriers.
12). Electron-hole pair occurs in _____ biased CB junction.
HintWhich moves backward.
13). Photodiode current is ______ by current gain of the transistor.
HintCause to increase in high quantity.
14).Electron-hole pair generation is done under an _____ field.
HintWhich is producing electricity.
15). Phototransistor is incorporated under _____?
HintA set of electronic components on a small flat piece.
Read more about Integrated circuit
16). Phototransistor offers a reasonable ____?
HintSomething which can move quickly.
17). Phototransistors are easy _____ due to transient voltage spikes, and surges.
HintPhysical harm on something.
18). Phototransistors are classified into ____ types.
HintEven value.
19). In a phototransistor, the base current is controlled by ____ light or infrared light.
HintWhich can be seen.
20). The operation range of a phototransistor depends on applied______ intensity?
HintWhich is a bright form of energy.
21). How many operating modes exist in phototransistors?
HintEven value.
22). If there is no light in a phototransistor, then there is no flow of ____ in the transistor?
HintMeasured as net flow of electric charge.
23). Does The switch-mode work in the _____ mode system?
HintHaving two positions.
24). Active mode is called linear which is _____ toward the light stimuli.
HintHaving a constant ratio to another quantity.
25). Due to low-level intensity, phototransistors provide current gain which is equal to ___ transistors?
HintWhich represents a dual role.

Phototransistors MCQs for Quiz

26). Sensitivity of the phototransistor depends on the type of selected ______ used?
HintA mixture of substances that constituents an object.
27). For Silicon material, the electromagnetic wavelength range is 190 to ____nm.
HintMid value.
28). For Germanium material, the electromagnetic wavelength range is ___ to 1700nm.
HintMid value.
29). For Indium gallium arsenide material, the electromagnetic wavelength range is ___ to 2600nm.
HintWhich represents the difference of 1000-200 values.
30). For proper functioning of phototransistors ____ technology is used.
HintSomething serving as support.
31). For Lead sulfide material, the electromagnetic wavelength range is ___ than 1000nm.
HintA smaller amount of something.
32).Normal phototransistors are designed using _____?
HintA nonmetallic chemical element.
33). SMT Stands for ______?
HintElectric components are directly mounted on the surface..
34).THT stands for ______?
HintHoles are drilled on the circuit board.
35). Phototransistors include a ____ filter, which is used to block observable light.
HintTo bring to ultimately end.
36).Light detection is improved by ____ coating.
HintCoated with transparent film.
37). The output of a phototransistor depends on the _____ of incident light.
HintDistance between two identical points.
38). _____ detects the presence of an object by generating the light.
HintThis is a type of photoelectric sensor.
39)._____ is the same as a transformer in which output is electrically isolated from the input.
HintWhich is also called optocoupler.
40). Phototransistor which converts ____ energy into electrical energy.
HintElectromagnetic spectrum viewed by the human eye.
41). The output response of a phototransistor is very ____?
HintWhich is less to an extent.
42). Phototransistor has ____ dark current.
HintWhich is up to a maximum extent.
43). Only ____ biasing is used in phototransistors.
HintDirection facing towards the front.
44). Linear response range of a phototransistor is very ____?
HintWhich is least concerning.
45). Phototransistors symbol has two ___ which indicates the light incident.
HintUsed to indicate direction.
46). In phototransistors, the base to collector junction size is _____ due to light sensitivity.
HintThe more advanced ones.
47). Size of junction determines better junction _____?
HintThe amount of electric charge stored on the conductor.
48). Phototransistor has a ____ frequency response compared to photodiodes.
HintWhich is not so much.
49). Best example of a phototransistor IC is ____?
HintWhich represents the least even value starting.
50). After complete setup the phototransistor is placed in a ____ box.
HintWhich is related to metals.

Phototransistors MCQs for Students

51). ___ is placed at the top of the metallic box to absorb incident radiation.
HintWhich is a transparent material.
52). Magnitude of current _____ along with the intensity of light.
HintWhich is the rise in size.
53). Collector current is supplied in a phototransistor using ___ dimensions.
HintCurrent equal to thousand of an ampere.
54). Noise ____ is more immune to phototransistors.
HintWhich is a disturbance.
55). Peak wavelength value of phototransistor is ____nm.
HintWhich represents a difference of 1000-60.
56). The maximum power supplied to the phototransistor is ____W.
HintWhich is a multiple of 10 and 10.
57). Maximum current allowed up to ___nA to run a phototransistor.
HintWhich is a century.
58). The viewing angle difference in phototransistors is ____ degrees.
HintMid value.
59). Maximum breakdown voltage is ____ in VCE.
HintWhich is a difference of 50-30 values.
60). Frequent occurrence of _____ surges takes place in phototransistors.
HintWhich charges the materials.
61). _________ is defined as the ratio of photoelectric current to incident luminous flux.
HintWhich response to bright color.
62). _____ is used as the sensitivity of phototransistors which is a function of wavelength.
HintRelative efficiency of deflection.
63).____gain indicates the efficiency of converting light into electrical energy.
HintIn which electrically charged particles are released.
64). Speed of response is ____ proportional to phototransistor gain.
HintWhich represents oppositely.
65). Phototransistors are less noisy compared to _____ photodiodes.
HintOccurs in insulators and semi-conductors.
66)._____ are affected by electromagnetic energy.
HintWhere light can reach the base.
67). Output of phototransistors depends on the area of CB Junction, wavelength, and DC___ of the transistor.
HintChange in collector current to emitter current.
68). A small reverse saturation current flow is called ___ current.
HintWhich represents no light.
69). Phototransistors can be prone to ____ damage due to voltage breakdown.
HintWhich remains unchanged indefinitely.
70). In ____ transistors, the entire device is made up of single material.
HintWhich represents a single.
71)._____ can be converted into a phototransistor by removing emitter terminals.
HintSemiconductor device which is exposed to light.
72). In photodarlington, the ____ induces much more power i.e, sensitivity rises.
HintEmitter and collector current increases.
73)._____ contains a phototransistor that is activated by an internal LED device.
HintTransfers electrical signal between isolated circuits.
Read more about LED .
74). Phototransistor is interfaced with ____ containing ADC.
HintWhich embeds all electronic components.
75). With slight modifications to the Light-operated relay circuit which can implement ____?
HintWithout no light focus on the switch.

Phototransistors MCQs for Interviews

76). When the intensity of light is less, then the phototransistor is in ___ mode.
HintWhich is the unstable mode.
77). Phototransistor works on the principle of _____ effect.
HintEmission of electrons from the surface.
78). Phototransistors widely find their applications in ____ readers.
HintA card perforated according to code.
79). Phototransistors are effectively utilized in _____ systems.
HintWhich counts the whole system.
80). The device which converts one energy to another energy is called____?
HintVariations in physical quantity.
81). If the wavelength is increased, then the _____ will be decreased.
HintWhich represents a particular period.
82). As the base current increases, the illumination level also ___?
HintMake it greater in size.
83). The circuitry of this type is ____ complicated.
HintMake it lower in size.
84). At high frequencies, phototransistors don't ___ properly.
HintTasks to be undertaken.
85). Effective resistances have ____ fluctuates with temperature variations.
HintWhich is of lower rank.
86). Hetero structures use different materials at PN, and it produces a high ____efficiency.
HintChanging from one method to another.
87). Homostructures use a ___ material throughout the semiconductor device.
HintWhich represents a similar one.
88). Phototransistors cannot handle high voltages like ____?
HintUsed in photography as flashes.
89).Units of light intensity are ____?
HintWhich represents watts in 10^-3.
90). Phototransistors generate only ___?
HintPassage or movement of electrons.
91). Phototransistors are sensitive to _____ light sources like sunlight, fluorescent, and lasers.
HintWhich is unlike in nature.
92).Phototransistors are _____ reliable.
HintWhich is a high degree.
93). Phototransistors are ____ stable.
HintWhich is a limited period.
94). Phototransistors are available in ____ packages.
HintWhich is very distinct/separate.
95).Phototransistors are used in _____ detectors.
HintWhich is in the presence of time.
96). Most widely used applications of phototransistors are ____?
HintWhich is taken into account.
97). A small is placed at the surface of ____ junction to place the lens.
HintWhich represents the collector base.
98). Basically, phototransistors do not have a ___ connection?
HintWhich is the lowest part of the edge.
99)._____ cannot generate a voltage.
HintAn organism that responds to light.
100). Phototransistors are used in ___ to measure speed and direction.
HintConverts data into other formats.

For More MCQs

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