Microwave Devices and Circuits Question & AnswersJanuary 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? Klystron Magnetron Both a and b None of the above HintThe magnetron can't be used as an amplifier2). The frequency range from 40 to 75 GHz is designated as ________ L-band C-band Ka-band V-band HintThe L, C, and S bands frequency range is less than 40 GHz3).The super high frequency ranges from __________________ 3GHz to 30GHz 7GHz to 30GHz 0.3GHz to 3GHz 0.1GHz to 3GHz HintThe super high frequency is one type of microwave frequency band4). The frequency range from 2 to 4 GHz is designated as ________ Ku-band V-band S-band C-band HintThe Ku, V, and C bands frequency range is above 4 GHz5). The ultra-high frequency ranges from __________________ 3GHz to 30GHz 7GHz to 30GHz 0.3GHz to 3GHz 0.1GHz to 3GHz HintThe ultra-high frequency is one type of microwave frequency band6). The figure shown below is a block diagram of ___________________ using microwave device? Power transmission Klystron Magnetron None of the above HintThe klystron and magnetron are microwave devices7). The relative dielectric constant value of Al2O3 is around ____________________ 4*10^10 4*10^6 4*10^2 4*10^16 HintThe Al2O3 standard form is aluminum oxide8). What are the advantages of cross-field amplifiers? Good efficiency Capable of high power Low power gain All of the above HintThe CFA has good efficiency, high power, and low power gain9). The figure shown below is a construction of cavity ________________ Klystron Magnetron Amplifier None of the above HintThe magnetron is one type of microwave device10). The frequency range from 0.3 to 1 GHz is designated as ________ UHF L-band S-band C-band HintThe L, S, and C bands frequency range is above 1 GHz11). What is the standard form of VPE? Vapor Phase Epitaxy Vapor Plate Epitaxy Vapor Photo Epitaxy None of the above HintThe standard form of VPE is Vapor Phase Epitaxy12). What are the advanatges of magnetron? Utilizes lower voltages Smaller in size Poor noise All of the above HintThe magnetron utilizes lower voltages, is smaller in size, and the noise is poor13). The magnetron is a type of ________________ device? Amplifier Generator Oscillator None of the above HintIt is one type of oscillator14). The gain range of traveling wave tube is from ______________ decibels? 1-10dB 2-9dB 29-45dB 30-70dB HintThe gain range of TWT is more than thirty decibels15). The frequency range from 300 to 3000 GHz is designated as ________ L-band C-band Sub-millimeter wave None of the above HintThe L, C bands frequency range is less than 75 GHz16). In how many modes does Gunn diodes can operate? Two Four Six Eight HintThe Gunn oscillation, stable amplification, LSA oscillation, and bias circuit oscillation modes are the type of operating modes Read more about Gunn Diode17). What are the applications of IMPATT diodes? FDM TDM Both a and b None of the above HintThe IMPATT diodes are also used in the transmitter of the TV system, etc18). The refractive index value of corning veyor substrate material is ______ 1.458 2.345 5.43 3.4 HintThe refractive index value of corning veyor substrate material is not more than 1.519). What is the standard form of MBE? Molecular Beam Epitaxy Metal Beam Epitaxy Mica Beam Epitaxy None of the above HintThe standard form of MBE is Molecular Beam Epitaxy20). The frequency range from 1 to 2 GHz is designated as ________ Ku-band L-band S-band C-band HintThe Ku, S, and C bands frequency range is above 2 GHz21). The peak power is up to _______________ in traveling-wave tube? 30MW 40MW 50MW 70MW HintThe peak value is not more than 30MW in TWT22).The average power is up to _______________ in travelling-wave tube? 30MW b)c)d) 40MW 50MW 700KW HintThe average value is in KW in TWT23). The bandwidth in klystron microwave tube is between _____________________ percentage? 1-10% 2-98% 9-10% 1-8% HintThe babdwidth range is not more than ten percent Read more about Klystron Amplifier24).The bandwidth in traveling microwave tube is between _____________________ percentage? 1-10% 15-60% 9-10% 1-8% HintThe bandwidth is not more than 60%25). The frequency range from 30 to 300 GHz is designated as ________ L-band C-band Millimeter-wave None of the above HintThe L, C bands frequency range is less than 75 GHzMicrowave Devices and Circuits MCQs for Exams26). The refractive index value of plexiglass substrate material is ______ 1.490 2.345 5.43 3.4 HintThe refractive index value of plexiglass substrate material is not more than 1.527). What is the standard form of LPE? Liquid Photo Epitaxy Liquid Phase Epitaxy Liquid Poly Epitaxy None of the above HintThe standard form of LPE is Liquid Phase Epitaxy28). How many types of lithography technologies are there? Two Four Six Eight HintThere are four types of lithography technologies are there they are electron beam, ion beam, optical, and X-ray lithography29). What is the standard form of KPR? Kodak Photoresist Kodak Phase Kodak Poly phase None of the above HintThe standard form of KPR is Kodak Photoresist30). The figure shown below is a structure of __________________ Generator Oscillator Reflex klystron Magnetron HintThe reflex klystron is one type of microwave device31). The refractive index value of poly-cyclohexyl methacrylate substrate material is ____________ 1.490 1.504 5.43 3.4 HintThe refractive index value of poly-cyclohexyl methacrylate substrate material is not more than 1.632). The relative dielectric constant of alumina is _______________ 10 20 30 40 HintThe value of alumina relative dielectric constant is not more than ten33). The thermal conductivity value of alumina material is ______________ 1.7 0.3 3.7 4.4 HintThe thermal conductivity value of alumina material is not more than one34). The frequency range of magnetron microwave vacuum tube is ________________ 1-25GHz Few GHz to 100 GHz 100GHz 90GHz HintThe magnetron microwave vacuum tube range is not more than 25 GHz35). The output power of magnetron microwave vacuum tube is _______________ 10MW 20MW 30MW Several KW HintThe magnetron microwave vacuum tube output power is not in MW36). The efficiency of magnetron microwave vacuum tube is less than _______________ 200% 120% 30-60% 10% HintThe efficiency is not more than 60%37). In which one of the following tubes the field is stationary? Klystron Traveling wave tube Both a and b None of the above HintIn a traveling wave tube the field travels along with the beam38). What are the advantages of a klystron microwave tube? Has long life Low interpulse noise Wide bandwidth All of the above HintWhen compared to traveling wave tube the klystron features are good39). Which one of the following has less gain and less efficiency? Klystron TWT Both a and b None of the above HintThe klystron has high gain and good efficiency compared to a klystron40). The frequency range from 4 to 8 GHz is designated as ______________ Ku-band V-band S-band C-band HintThe Ku, V, and W bands frequency range is above 8 GHz41). The refractive index value of polyester glass substrate material is _______________ 1.490 1.500 5.43 3.4 HintThe refractive index value of polyester glass substrate material is not more than 1.642). The relative dielectric constant of beryllia material is __________________ 10 6 30 40 HintThe value of alumina relative dielectric constant is not more than six43). The thermal conductivity value of beryllia material is ________________ 5.7 6.3 2.5 4.4 HintThe thermal conductivity value of beryllia material is not more than three44). The alumina, GaAs, rutile, sapphire, beryllia, glass, garnet/ferrite are the ____________ materials? Substrate Conductor Both a and b None of the above HintSilver, gold, copper, and aluminum are the type of conductor materials45). Silver, gold, copper, and aluminum are the type of _____________ materials? Substrate Conductor Both a and b None of the above HintThe alumina, GaAs, rutile, sapphire, beryllia, glass, garnet/ferrite are the substrate materials46). The Cr-SiO, Ti, Ta, NiCr, Cr are the ____________films? Dielectric Resistive Both a and b None of the above HintThe Cr-SiO, Ti, Ta, NiCr, Cr are the dielectric films47). What is the standard form of MMIC? Monolithic Microwave Internal Circuits Monolithic Microwave Integrated Circuits Microwave Monolithic Integrated Circuits None of the above HintThe standard form of MMIC is Monolithic Microwave Integrated Circuits48). What are the advantages of monolithic microwave integrated circuits? Lightweight Low cost Small size All of the above HintThe monolithic microwave integrated circuits are low cost, small in size, and light-weight49). What is the standard form of PRR? Pulse Radiation Rate Pulse Repetition Rate Pulse Rate Repetition None of the above HintThe standard form of PRR is Pulse Repetition Rate50). The frequency range from 8 to 12 GHz is designated as ________ Ku-band V-band X-band W-band HintThe Ku, V, and W bands frequency range is above 12 GHzMicrowave Devices and Circuits MCQs for Quiz51). The microwave integrated circuits exist in ______________ different forms? Discrete circuit Hybrid MIC MMIC All of the above HintThe microwave integrated circuits exist in three different forms they are discrete circuit, hybrid MIC, and MMIC52). What is the standard form of MIC? Microwave Integral Circuits Microwave Integrated Circuits Microwave Isolator Circuits None of the above HintThe standard form of MIC is Microwave Integrated Circuits53). What is the standard form of TWT? Traveling White Tube Traveling Wave Tire Traveling Wave Tube None of the above HintIt is a type of amplifier54). The frequency range of the traveling wave tube is from ______________ GHz? 0.3 to 50 0.3 to 500 0.3 to 510 0.3 to 530 HintThe frequency range of the traveling wave tube is not more than 50 GHz55). The refractive index value of crystal quartz substrate material is ________________ 1.540 2.345 5.43 3.4 HintThe refractive index value of crystal quartz substrate material is not more than 1.556). The frequency-agile coaxial magnetrons are categorized into ___________ types? Two Three Four Five HintThe frequency-agile coaxial magnetrons are categorized into three types they are dither magnetrons, tunable/dither magnetrons, and Accutane magnetrons57). What is the standard form of ECM? Electrical Counter Measures Electronic Counter Machines Electronic Counter Measures None of the above HintThe standard form of ECM is Electronic Counter Measures58). The frequency limitation of the varactor diode is less than ______ GHz? 600 500 400 300 HintThe varactor diode frequency range shouldn't be greater than 300GHz59). The frequency limitation of Gunn diode is less than ______ GHz? 600 500 400 140 HintThe Gunn diode frequency range shouldn't be greater than 140GHz60). The frequency range from 12 to 18 GHz is designated as _____________ Ku-band K-band Ka-band W-band HintThe K, Ka, and W bands frequency range is above 18 GHz61). The refractive index value of polymethyl methacrylate substrate material is _______________ 1.491 1.500 5.43 3.4 HintThe refractive index value of polymethyl methacrylate substrate material is not more than 1.562). The frequency range of the traveling wave tube is _______________ 1-10GHz Few GHz to 100 GHz 100GHz 90GHz HintThe traveling wave tube range is not more than 10 GHz63). The output power of traveling wave tube is ___________ 10MW 20MW 30MW Order of KW HintThe traveling wave tube output power is not in MW64). The efficiency of traveling wave tube is less than ___________ 200% 120% 30-60% 20% HintThe efficiency is not more than 20%65). Which one of the following circuits is resonant type? Klystron Traveling wave tube Both a and b None of the above HintIn a traveling wave tube the circuit is a non-resonant type66). In which one of the following tubes the wave is a propagating wave? Klystron Traveling wave tube Both a and b None of the above HintIn the klystron wave tube the waves are non-propagating67). Which one of the following has low power output? Klystron Traveling wave tube Both a and b None of the above HintThe power output is low in klystron and high in the traveling-wave tube68). Which one of the following has a short life? Klystron Traveling wave tube Both a and b None of the above HintThe life is short in klystron and long in traveling-wave tube69). Which one of the following uses cavities for output and input circuits? Klystron Traveling wave tube Both a and b None of the above HintThe traveling wave tube uses nin resonant circuits for output and input circuits70). The frequency range from 18 to 27 GHz is designated as ______________ V-band K-band Ka-band W-band HintThe V, Ka, and W bands frequency range is above 27 GHz71). The refractive index value of zinc crown glass substrate material is ______ 1.491 1.508 5.43 3.4 HintThe refractive index value of zinc crown glass substrate material is not more than 1.672). What is the standard form of FWCFA's? Forward Wave Cross Filed Amplifiers Forward Wave Cross Filed Accumulators Forward Wave Common Filed Accumulators None of the above HintIt is a type of cross-field amplifier73). Which one of the following circuits is non-resonant type? Klystron Traveling wave tube Both a and b None of the above HintIn klystron microwave tube the circuit is resonant type74). In which one of the following tubes is the wave is a non-propagating wave? Klystron Traveling wave tube Both a and b None of the above HintIn a traveling wave tube the waves are propagating75). Which one of the following has high power output? Klystron Traveling wave tube Both a and b None of the above HintThe power output is low in klystron and high in a traveling-wave tubeMicrowave Devices and Circuits MCQs for Interviews76). Which one of the following has a long life? Klystron Traveling wave tube Both a and b None of the above HintThe life is short in klystron and long in traveling-wave tube77). Which one of the following uses non-resonant wave circuits for output and input circuits? Klystron Traveling wave tube Both a and b None of the above HintThe klystron uses cavities for output and input circuits.78). The magnetrons are categorized into _________ types? One Two Three Four HintThe magnetrons are categorized into three types they are negative resistance type, cavity type, and cyclotron frequency type79). The frequency limitation of IMPact ionization Avalanche Transit-Time diode is less than ______ GHz? 600 500 400 300 HintThe IMPATT diode frequency range shouldn't be greater than 300GHz80). The frequency range from 27-40 GHz is designated as ________ L-band C-band Ka-band S-band HintThe L, C, and S bands frequency range is less than 27 GHz81). ______ are the substrate materials for IMPact ionization Avalanche Transit-Time diode? Si GaAs InP All of the above HintThe Si, GaAs, InP are substrate materials for IMPATT diodes82). ______ are the substrate materials for Gunn diode? Si GaAs InP Both b and c HintThe silicon is not substrate material for Gunn diodes83). ______ are the substrate materials for P-I-N diode? Si GaAs InP Both a and b HintThe indium phosphide is not substrate material for P-I-N diodes84). ______ are the substrate materials for varactor diode? Si GaAs InP Both a and b HintThe indium phosphide and silicon are not substrate materials for varactor diodes85). What are the advantages of IMPATT diodes? Low cost, low power supply Reliable Light-weight All of the above HintThe IMPATT diodes are low cost, requires a low power supply, are reliable and light-weight86). What are the advantages of TRAPATT diodes? Low power supply Reliable Low cost All of the above HintThe TRAPATT diodes are low cost, requires a low power supply, and are highly reliable87). What are the advantages of BARITT diodes? Low power supply Noise is low Low cost, reliable All of the above HintThe BARITT diodes are less in cost, requires a low power supply, noise is low and they are highly reliable88). The frequency limitation of the P-I-N diode is less than ______ GHz? 600 500 400 100 HintThe P-I-N diode frequency range shouldn't be greater than 100GHz89). The frequency limitation of FET & HEMT diode is less than ______ GHz? 600 500 400 100 HintThe FET & HEMT diode frequency range shouldn't be greater than 100GHz90). The extra high frequency ranges from __________________ 30GHz to 300GHz 7GHz to 30GHz 0.3GHz to 3GHz 0.1GHz to 3GHz HintThe extra-high frequency is one type of microwave frequency band91). The refractive index value of fused silica substrate material is ________________ 1.458 2.345 5.43 3.4 HintThe refractive index value of fused silica substrate material is not more than 1.592). What is the standard form of BWCFA's? Backward Wave Cross Filed Amplifiers Backward Wave Cross Filed Accumulators Backward Wave Common Filed Accumulators None of the above HintIt is a type of cross-field amplifier93). What is the standard form of HEMT? High Electron Mobility Transistors High Electron Mobility TransformerS High Electron Main Transistors None of the above HintThe standard form of HEMT is High Electron Mobility Transistors94). What is the standard of the YIG device? Yttrium Iron Gunn Yttrium Iron Granet Yttrium Ion Granet None of the above HintThe standard of the YIG device is Yttrium Iron Granet95). What is the standard form of PHEMT? Phosphorus High Electron Mobility Transistors Phosphate High Electron Mobility Transformers Pseudomorphic High Electron Mobility Transistors None of the above HintIt is a type of transistor96). What is the standard form of BWO? Back Wave Oscillator Backward Wave Oscillator Backward Oscillator None of the above HintIt is one type of oscillator97). Which one of the following has high gain and good efficiency? Klystron TWT Both a and b None of the above HintThe traveling wave tube has less gain and less efficiency compared to the klystron98). What is the standard form of CFA? Control Field Amplifier Common Field Amplifier Cross Field Amplifier None of the above HintIt is one type of amplifier99). The magnetron and CFA are the two types of _________________ devices? Cross-field Linear beam Both a and b None of the above HintThe magnetron and CFA are not linear beam devices100). The frequency range from 75 to 110 GHz is designated as ________ L-band C-band Ka-band W-band HintThe L, C, and Ka bands frequency range is less than 75 GHz Time is Up! Time's up
