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MOSFET Question & Answers

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This article lists 100 MOSFET MCQs for engineering students. All the MOSFET Questions & Answers given below includes solution and link wherever possible to the relevant topic.

A FET (Field Effect Transistor) has certain disadvantages like higher resistance at the drain & slow operation. To overcome this, a MOSFET is designed. These can be used in both analog and digital monolithic Integrated circuits as active components and distinct devices. It is manufactured with 'controlled oxidation of the semiconductor typically using silicon.

1). What are the disadvantages of Field Effect Transistors?
HintTo overcome the disadvantages of FET
2). Who introduced ‘First Vertical Power MOSFET’?
HintHitachi in 1969
3). What does MOSFET stands for?
HintTo overcome the drawbacks of FET
4). What type of a device is MOSFET?
HintCurrent at the drain can be controlled by the voltage
5). What type of carriers are controlled in a MOSFET?
HintBased on the type of MOSFET
6). How many terminals does a MOSFET possess?
HintSource, gate, and drain
7). What are the main terminals that carry current?
HintTerminals Source and the Drain
8). What type of MOSFETs preferred for Power electronics?
Hint‘N-channel’ made Enhancement MOSFETs
9). Which layer isolates terminal Gate from semiconductor?
HintSilicon dioxide (Thin layer) is used to isolate the gate
10). MOSFET is a __________ device.
HintMOSFET is a Voltage controlled device

Read More About MOSFET

11). Which transistor is preferred for applications of High power?
HintMOSFETs are commonly used
12). What type of transistors are commonly used in digital and the analog circuits?
HintMOSFETs are preferred
13). ____________ are normally referred to as ON switches.
HintWith the terminal gate open a non-zero current at drain tends to flow
14). Which substrate does a n-channel made device possess?
HintP-type made substrate
15). Which Transistor is used in VLSI?
HintCMOS offers low consumption of power
16). Which transistor offer highest speed?
HintCombination of both ‘N-channel’ and ‘P-channel MOSFETs
17). What is required to switch OFF the MOSFET (Depletion type)?
HintON switches
18). Which one is referred to as Open switch?
HintEnhancement mode MOSFETs are OFF
19). Unbroken Line in the symbol of MOSFET known as _____ MOSFET.
HintDepletion mode of MOSFETs
20). What is represented by the line amid Source and Drain?
HintSemi-conductive channel of the transistor
21). What happens to line of channel in Enhancement MOSFETs?
HintEnhancement, it is broken
22). What differentiates ‘N-type’ and ‘P-type’ MOSFETs?
HintType of channel MOSFETs
23). In which class does MOSFETs work as amplifier?
HintMOSFETs belong to Class-D
24). At VGS =0, what happens to the channel of Depletion MOSFETs?
HintON Switches
25). In which MOSFET the channel gates depleted for –VGS ?
HintDepletion MOSFET

MOSFET MCQs with Answers

26). In which MOSFET the channel gates depleted for +VGS ?
HintDepletion MOSFET
27). What type of MOSFETs possess Undoped or Lightly doped channel?
HintEnhancement MOSFETs is nonconductive
28). What condition makes MOSFET a Transconductance device?
HintN-channel Enhancement MOSFET
29). Transistor is OFF in P-channel eMOSFET for?
HintPositive voltage of Source and Gate
30). What are the different regions MOSFET operate?
HintThree regions

Read More About P-Channel MOSFET

31). What is the condition of Cut-off region?
HintCut-off must satisfy VGS
32). What do you name MOSFET with n-channel?
HintBased on a variant of channel
33). What condition satisfies Saturation region?
HintAmplification
34). MOSFET in Cut-off region works as _______.
Hint MOSFETs are usually OFF in this region
35). What is the condition of Linear region?
HintSwitching
36). In which region MOSFETs perform ‘Switching’?
HintSaturation region in MOSFETs
37). Depletion mode MOSFETs can operate in __________ mode.
HintD-MOSFETs can operate in both modes
38). Which substrate used in MOSFETs of n-channel?
Hint Amid two n-regions
39). Where the Metallic gate is deposited in MOSFETs?
HintThe 'oxide layer is an insulator
40). MOSFET is _______.
HintBidirectional and have unipolar characteristics
41). In which region IDS & VDS are dependent?
HintAn increase in VDS results in an increase in IDS
42). MOSFETs as Amplifiers operate in which region?
HintIDS & VDS are dependent on the Ohmic region
43). Of which region IDS remains constant?
HintVDS increase doesn’t affect the value of IDS
44). Which is known as Control terminal in MOSFET?
HintGate terminal in MOSFET
45). When are MOSFETs are preferred?
HintLow voltages and for high-frequency applications
46). Which determine the rise & fall timings of voltage at drain?
HintTransfer capacitor is known to determine the fall and rise times
47). What are used in MOSFETs to determine current fall and rise timings while switching?
HintCapacitor at input along with Gate resistance
48). What can destroy Gate Oxide Layer?
HintWith proper discharging and grounding
49). What happens to MOSFET in safe area of operating?
HintSOA MOSFET doesn’t change under any Reverse and forward biasing
50). Why Switching delays occur in MOSFET?
HintFinite discharging and charging times of o/p & i/p capacitors

MOSFET Interview Questions & Answers

51). What are the majority carriers in n-channel MOSFET?
HintN-channel
52). MOSFETs doesn’t undergo ___________.
HintBJTs
53). What happens to the Leakage current in MOSFET?
HintLeakage currents are very less
54). What is the minimum amount of voltage required to operate MOSFET?
HintMinimum required to make the MOSFETs conduct
55). What type of device is MOSFET?
HintPassive element in the circuit
56). Which MOSFET doesn’t have channel?
HintEnhancement variant of MOSFET
57). What happens to noise in MOSFET?
HintNoise in MOSFET is less
58). What happens to width of channel when negative voltages applied at gate of MOSFET?
HintCut-off region
59). Enhancement MOSFET operates in _____ modes
HintBased on input voltages applied
60). What happens to Transconductance in MOSFETs compared to BJTs?
HintMOSFETs possess a very low value of Transconductance
61). Amplifiers made of Depletion MOSFETs resembles _____.
HintJFET and DMOSFETs
62). On what MOSFET working depend?
HintMOS capacitor is considered to be essential
63). Which type of voltage induce channel in ‘n-channel’ Enhancement MOSFET?
HintPositive voltage applied at the gate
64). How the channel’s conductivity enhanced in E MOSFET?
HintVGS enhances the conductivity of the channel
65). What happens to channel in EMOSFET if VGS applied is below threshold?
HintNo channel
66). Depletion MOSFET conducts when_______.
HintMOSFETs are ON
67). LD MOSFET is an acronym of?
HintVariant of Enhancement MOSFET
68). Which device has short channel?
HintMOSFET
69). What type of transistors are scaled to small dimensions?
HintMOSFETs in comparison to other transistors
70). MOSFET is also referred to as ________.
Hint Insulation of terminal gate from the other terminals
71). IGFET stands for _______.
HintGate is insulated in MOSFET
72). On what basis MOSFET characteristics depend on?
HintVarious modes of operation
73). What are the benefits of short channel in LDMOSFETs?
HintPower-related applications
74). VMOSFETs has _______ connections of source.
HintTwo connections of Source
75). When a MOSFET (n-channel) operates in First Quadrant?
HintPositive Voltage application at terminal drain

MOSFET MCQs for Exams

76). MOS Technology is based on _____.
HintDRAM
77). While the study of Characteristics of MOSFET what is found?
HintMOS Capacitors
78). What are used in the production of Reprogrammable ROM?
HintFGMOS
79). FGMOS stands for ________.
HintFloating cells of memory
80). What type of memories are designed using FGMOS?
HintNVM technologies
81). What happens to MOSFET when the flow of current is absent at terminal Gate?
HintVoltage Controlled Resistor
82). What works as Conducting channel in MOSFET?
HintInversion layer functions as a conducting channel
83). With p variant substrate what does Inversion charge consists of?
HintP-substrate (n-channel device)
84). Depletion region & substrate (neutral) are isolated by?
HintIsolation among the fabricated devices over the similar substrate
85). GCA stands for _______.
HintSemi-analytical and the Analytical models
86). GCA of MOSFETs is acceptable for?
HintLarge aspect ratio
87). How the capacitor gets charged in the MOSFET circuit of Switching?
HintApplied VGS controls IDS
88). When is Power handling capacity limited?
HintMOSFET is turned ON
89). What classifies the mode in MOSFETs?
HintBased on the channels
90). Can a Microcontroller drive MOSFET (p-channel)?
HintDriving devices with higher currents
91). What does the arrow on MOSFETs symbol indicate?
HintThe electron's direction can be described
92). Chopper circuits prefer _________.
HintMOSFETs
93). Which is considered as the basic block of Digital Electronics?
Hint‘Modern Digital Electronics’
94). What can be the disadvantages of a MOSFET?
HintStatic charges can destroy MOSFET
95). The speed of switching in MOSFET is _____.
HintHigh speed of switching
96). What are important aspects of using a MOSFET?
HintHigh impedance at input and efficiency to operate with the low amount of voltages
97). What is preferred for the regulation of DC Motors?
HintPower MOSFET is used in the regulation
98). Which amplifiers are preferred during Radio frequency applications?
HintMOSFET amplifiers
99). CMOS stands for ___________.
HintPMOS & NMOS FET combination
100). What is BiCMOS?
HintA single IC accommodates BJT and CMOS

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