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Microwave Devices and Circuits Question & Answers

January 5, 2022 By WatElectronics

This article lists 100 Microwave Devices and Circuits MCQs for Engineering Students. All the Microwave Devices and Circuits Questions & Answers given below includes solution and link wherever possible to the relevant topic.

In microwave, the term micro means small with a wavelength ranging from one meter to one millimeter (1m to 1mm). The corresponding frequency ranges from 300MHz to 300GHz. The tunnel diode, Gunn diode, varactor diode, etc are types of microwave semiconductor devices.

The microwave frequencies can be categorized into three bands they are ultra-high frequency ranges from 0.3GHz to 3GHz, super high frequency ranges from 3GHz to 30GHZ, and the third band is extra high frequency ranges from 30GHz to 300GHz.

The bandwidth in the traveling microwave tube is between fifteen to sixty percent, and the bandwidth in the klystron microwave tube is between one to eight percent. The klystron microwave tubes have a long life, low interpulse noise, and wide bandwidth compared to traveling wave tubes.

The magnetron and CFA are the two types of cross-field devices. Compact microwaves, mid-size microwaves, full-size microwaves are the different types of microwaves. The advantages of microwave devices are no need for cables, multiple channels available, and has a wide bandwidth.

1). Which one of the following can be used as oscillators and amplifiers?
HintThe magnetron can't be used as an amplifier
2). The frequency range from 40 to 75 GHz is designated as ________
HintThe L, C, and S bands frequency range is less than 40 GHz
3).The super high frequency ranges from __________________
HintThe super high frequency is one type of microwave frequency band
4). The frequency range from 2 to 4 GHz is designated as ________
HintThe Ku, V, and C bands frequency range is above 4 GHz
5). The ultra-high frequency ranges from __________________
HintThe ultra-high frequency is one type of microwave frequency band
6). The figure shown below is a block diagram of ___________________ using microwave device?
Block Diagram of Power Transmission Using Microwave
HintThe klystron and magnetron are microwave devices
7). The relative dielectric constant value of Al2O3 is around ____________________
HintThe Al2O3 standard form is aluminum oxide
8). What are the advantages of cross-field amplifiers?
HintThe CFA has good efficiency, high power, and low power gain
9). The figure shown below is a construction of cavity ________________
Cavity Magnetron
HintThe magnetron is one type of microwave device
10). The frequency range from 0.3 to 1 GHz is designated as ________
HintThe L, S, and C bands frequency range is above 1 GHz
11). What is the standard form of VPE?
HintThe standard form of VPE is Vapor Phase Epitaxy
12). What are the advanatges of magnetron?
HintThe magnetron utilizes lower voltages, is smaller in size, and the noise is poor
13). The magnetron is a type of ________________ device?
HintIt is one type of oscillator
14). The gain range of traveling wave tube is from ______________ decibels?
HintThe gain range of TWT is more than thirty decibels
15). The frequency range from 300 to 3000 GHz is designated as ________
HintThe L, C bands frequency range is less than 75 GHz
16). In how many modes does Gunn diodes can operate?
HintThe Gunn oscillation, stable amplification, LSA oscillation, and bias circuit oscillation modes are the type of operating modes
Read more about Gunn Diode
17). What are the applications of IMPATT diodes?
HintThe IMPATT diodes are also used in the transmitter of the TV system, etc
18). The refractive index value of corning veyor substrate material is ______
HintThe refractive index value of corning veyor substrate material is not more than 1.5
19). What is the standard form of MBE?
HintThe standard form of MBE is Molecular Beam Epitaxy
20). The frequency range from 1 to 2 GHz is designated as ________
HintThe Ku, S, and C bands frequency range is above 2 GHz
21). The peak power is up to _______________ in traveling-wave tube?
HintThe peak value is not more than 30MW in TWT
22).The average power is up to _______________ in travelling-wave tube?
HintThe average value is in KW in TWT
23). The bandwidth in klystron microwave tube is between _____________________ percentage?
HintThe babdwidth range is not more than ten percent
Read more about Klystron Amplifier
24).The bandwidth in traveling microwave tube is between _____________________ percentage?
HintThe bandwidth is not more than 60%
25). The frequency range from 30 to 300 GHz is designated as ________
HintThe L, C bands frequency range is less than 75 GHz

Microwave Devices and Circuits MCQs for Exams

26). The refractive index value of plexiglass substrate material is ______
HintThe refractive index value of plexiglass substrate material is not more than 1.5
27). What is the standard form of LPE?
HintThe standard form of LPE is Liquid Phase Epitaxy
28). How many types of lithography technologies are there?
HintThere are four types of lithography technologies are there they are electron beam, ion beam, optical, and X-ray lithography
29). What is the standard form of KPR?
HintThe standard form of KPR is Kodak Photoresist
30). The figure shown below is a structure of __________________
Structure of Reflex Klystron
HintThe reflex klystron is one type of microwave device
31). The refractive index value of poly-cyclohexyl methacrylate substrate material is ____________
HintThe refractive index value of poly-cyclohexyl methacrylate substrate material is not more than 1.6
32). The relative dielectric constant of alumina is _______________
HintThe value of alumina relative dielectric constant is not more than ten
33). The thermal conductivity value of alumina material is ______________
HintThe thermal conductivity value of alumina material is not more than one
34). The frequency range of magnetron microwave vacuum tube is ________________
HintThe magnetron microwave vacuum tube range is not more than 25 GHz
35). The output power of magnetron microwave vacuum tube is _______________
HintThe magnetron microwave vacuum tube output power is not in MW
36). The efficiency of magnetron microwave vacuum tube is less than _______________
HintThe efficiency is not more than 60%
37). In which one of the following tubes the field is stationary?
HintIn a traveling wave tube the field travels along with the beam
38). What are the advantages of a klystron microwave tube?
HintWhen compared to traveling wave tube the klystron features are good
39). Which one of the following has less gain and less efficiency?
HintThe klystron has high gain and good efficiency compared to a klystron
40). The frequency range from 4 to 8 GHz is designated as ______________
HintThe Ku, V, and W bands frequency range is above 8 GHz
41). The refractive index value of polyester glass substrate material is _______________
HintThe refractive index value of polyester glass substrate material is not more than 1.6
42). The relative dielectric constant of beryllia material is __________________
HintThe value of alumina relative dielectric constant is not more than six
43). The thermal conductivity value of beryllia material is ________________
HintThe thermal conductivity value of beryllia material is not more than three
44). The alumina, GaAs, rutile, sapphire, beryllia, glass, garnet/ferrite are the ____________ materials?
HintSilver, gold, copper, and aluminum are the type of conductor materials
45). Silver, gold, copper, and aluminum are the type of _____________ materials?
HintThe alumina, GaAs, rutile, sapphire, beryllia, glass, garnet/ferrite are the substrate materials
46). The Cr-SiO, Ti, Ta, NiCr, Cr are the ____________films?
HintThe Cr-SiO, Ti, Ta, NiCr, Cr are the dielectric films
47). What is the standard form of MMIC?
HintThe standard form of MMIC is Monolithic Microwave Integrated Circuits
48). What are the advantages of monolithic microwave integrated circuits?
HintThe monolithic microwave integrated circuits are low cost, small in size, and light-weight
49). What is the standard form of PRR?
HintThe standard form of PRR is Pulse Repetition Rate
50). The frequency range from 8 to 12 GHz is designated as ________
HintThe Ku, V, and W bands frequency range is above 12 GHz

Microwave Devices and Circuits MCQs for Quiz

51). The microwave integrated circuits exist in ______________ different forms?
HintThe microwave integrated circuits exist in three different forms they are discrete circuit, hybrid MIC, and MMIC
52). What is the standard form of MIC?
HintThe standard form of MIC is Microwave Integrated Circuits
53). What is the standard form of TWT?
HintIt is a type of amplifier
54). The frequency range of the traveling wave tube is from ______________ GHz?
HintThe frequency range of the traveling wave tube is not more than 50 GHz
55). The refractive index value of crystal quartz substrate material is ________________
HintThe refractive index value of crystal quartz substrate material is not more than 1.5
56). The frequency-agile coaxial magnetrons are categorized into ___________ types?
HintThe frequency-agile coaxial magnetrons are categorized into three types they are dither magnetrons, tunable/dither magnetrons, and Accutane magnetrons
57). What is the standard form of ECM?
HintThe standard form of ECM is Electronic Counter Measures
58). The frequency limitation of the varactor diode is less than ______ GHz?
HintThe varactor diode frequency range shouldn't be greater than 300GHz
59). The frequency limitation of Gunn diode is less than ______ GHz?
HintThe Gunn diode frequency range shouldn't be greater than 140GHz
60). The frequency range from 12 to 18 GHz is designated as _____________
HintThe K, Ka, and W bands frequency range is above 18 GHz
61). The refractive index value of polymethyl methacrylate substrate material is _______________
HintThe refractive index value of polymethyl methacrylate substrate material is not more than 1.5
62). The frequency range of the traveling wave tube is _______________
HintThe traveling wave tube range is not more than 10 GHz
63). The output power of traveling wave tube is ___________
HintThe traveling wave tube output power is not in MW
64). The efficiency of traveling wave tube is less than ___________
HintThe efficiency is not more than 20%
65). Which one of the following circuits is resonant type?
HintIn a traveling wave tube the circuit is a non-resonant type
66). In which one of the following tubes the wave is a propagating wave?
HintIn the klystron wave tube the waves are non-propagating
67). Which one of the following has low power output?
HintThe power output is low in klystron and high in the traveling-wave tube
68). Which one of the following has a short life?
HintThe life is short in klystron and long in traveling-wave tube
69). Which one of the following uses cavities for output and input circuits?
HintThe traveling wave tube uses nin resonant circuits for output and input circuits
70). The frequency range from 18 to 27 GHz is designated as ______________
HintThe V, Ka, and W bands frequency range is above 27 GHz
71). The refractive index value of zinc crown glass substrate material is ______
HintThe refractive index value of zinc crown glass substrate material is not more than 1.6
72). What is the standard form of FWCFA's?
HintIt is a type of cross-field amplifier
73). Which one of the following circuits is non-resonant type?
HintIn klystron microwave tube the circuit is resonant type
74). In which one of the following tubes is the wave is a non-propagating wave?
HintIn a traveling wave tube the waves are propagating
75). Which one of the following has high power output?
HintThe power output is low in klystron and high in a traveling-wave tube

Microwave Devices and Circuits MCQs for Interviews

76). Which one of the following has a long life?
HintThe life is short in klystron and long in traveling-wave tube
77). Which one of the following uses non-resonant wave circuits for output and input circuits?
HintThe klystron uses cavities for output and input circuits.
78). The magnetrons are categorized into _________ types?
HintThe magnetrons are categorized into three types they are negative resistance type, cavity type, and cyclotron frequency type
79). The frequency limitation of IMPact ionization Avalanche Transit-Time diode is less than ______ GHz?
HintThe IMPATT diode frequency range shouldn't be greater than 300GHz
80). The frequency range from 27-40 GHz is designated as ________
HintThe L, C, and S bands frequency range is less than 27 GHz
81). ______ are the substrate materials for IMPact ionization Avalanche Transit-Time diode?
HintThe Si, GaAs, InP are substrate materials for IMPATT diodes
82). ______ are the substrate materials for Gunn diode?
HintThe silicon is not substrate material for Gunn diodes
83). ______ are the substrate materials for P-I-N diode?
HintThe indium phosphide is not substrate material for P-I-N diodes
84). ______ are the substrate materials for varactor diode?
HintThe indium phosphide and silicon are not substrate materials for varactor diodes
85). What are the advantages of IMPATT diodes?
HintThe IMPATT diodes are low cost, requires a low power supply, are reliable and light-weight
86). What are the advantages of TRAPATT diodes?
HintThe TRAPATT diodes are low cost, requires a low power supply, and are highly reliable
87). What are the advantages of BARITT diodes?
HintThe BARITT diodes are less in cost, requires a low power supply, noise is low and they are highly reliable
88). The frequency limitation of the P-I-N diode is less than ______ GHz?
HintThe P-I-N diode frequency range shouldn't be greater than 100GHz
89). The frequency limitation of FET & HEMT diode is less than ______ GHz?
HintThe FET & HEMT diode frequency range shouldn't be greater than 100GHz
90). The extra high frequency ranges from __________________
HintThe extra-high frequency is one type of microwave frequency band
91). The refractive index value of fused silica substrate material is ________________
HintThe refractive index value of fused silica substrate material is not more than 1.5
92). What is the standard form of BWCFA's?
HintIt is a type of cross-field amplifier
93). What is the standard form of HEMT?
HintThe standard form of HEMT is High Electron Mobility Transistors
94). What is the standard of the YIG device?
HintThe standard of the YIG device is Yttrium Iron Granet
95). What is the standard form of PHEMT?
HintIt is a type of transistor
96). What is the standard form of BWO?
HintIt is one type of oscillator
97). Which one of the following has high gain and good efficiency?
HintThe traveling wave tube has less gain and less efficiency compared to the klystron
98). What is the standard form of CFA?
HintIt is one type of amplifier
99). The magnetron and CFA are the two types of _________________ devices?
HintThe magnetron and CFA are not linear beam devices
100). The frequency range from 75 to 110 GHz is designated as ________
HintThe L, C, and Ka bands frequency range is less than 75 GHz
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