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? Klystron Magnetron Both a and b None of the above Hint 2). The frequency range from 40 to 75 GHz is designated as ________ L-band C-band Ka-band V-band Hint 3).The super high frequency ranges from __________________ 3GHz to 30GHz 7GHz to 30GHz 0.3GHz to 3GHz 0.1GHz to 3GHz Hint 4). The frequency range from 2 to 4 GHz is designated as ________ Ku-band V-band S-band C-band Hint 5). The ultra-high frequency ranges from __________________ 3GHz to 30GHz 7GHz to 30GHz 0.3GHz to 3GHz 0.1GHz to 3GHz Hint 6). The figure shown below is a block diagram of ___________________ using microwave device? Power transmission Klystron Magnetron None of the above Hint 7). The relative dielectric constant value of Al2O3 is around ____________________ 4*10^10 4*10^6 4*10^2 4*10^16 Hint 8). What are the advantages of cross-field amplifiers? Good efficiency Capable of high power Low power gain All of the above Hint 9). The figure shown below is a construction of cavity ________________ Klystron Magnetron Amplifier None of the above Hint 10). The frequency range from 0.3 to 1 GHz is designated as ________ UHF L-band S-band C-band Hint 11). What is the standard form of VPE? Vapor Phase Epitaxy Vapor Plate Epitaxy Vapor Photo Epitaxy None of the above Hint 12). What are the advanatges of magnetron? Utilizes lower voltages Smaller in size Poor noise All of the above Hint 13). The magnetron is a type of ________________ device? Amplifier Generator Oscillator None of the above Hint 14). The gain range of traveling wave tube is from ______________ decibels? 1-10dB 2-9dB 29-45dB 30-70dB Hint 15). The frequency range from 300 to 3000 GHz is designated as ________ L-band C-band Sub-millimeter wave None of the above Hint 16). In how many modes does Gunn diodes can operate? Two Four Six Eight Hint Read more about Gunn Diode 17). What are the applications of IMPATT diodes? FDM TDM Both a and b None of the above Hint 18). The refractive index value of corning veyor substrate material is ______ 1.458 2.345 5.43 3.4 Hint 19). What is the standard form of MBE? Molecular Beam Epitaxy Metal Beam Epitaxy Mica Beam Epitaxy None of the above Hint 20). The frequency range from 1 to 2 GHz is designated as ________ Ku-band L-band S-band C-band Hint 21). The peak power is up to _______________ in traveling-wave tube? 30MW 40MW 50MW 70MW Hint 22).The average power is up to _______________ in travelling-wave tube? 30MW b)c)d) 40MW 50MW 700KW Hint 23). The bandwidth in klystron microwave tube is between _____________________ percentage? 1-10% 2-98% 9-10% 1-8% Hint Read more about Klystron Amplifier 24).The bandwidth in traveling microwave tube is between _____________________ percentage? 1-10% 15-60% 9-10% 1-8% Hint 25). The frequency range from 30 to 300 GHz is designated as ________ L-band C-band Millimeter-wave None of the above Hint Microwave Devices and Circuits MCQs for Exams 26). The refractive index value of plexiglass substrate material is ______ 1.490 2.345 5.43 3.4 Hint 27). What is the standard form of LPE? Liquid Photo Epitaxy Liquid Phase Epitaxy Liquid Poly Epitaxy None of the above Hint 28). How many types of lithography technologies are there? Two Four Six Eight Hint 29). What is the standard form of KPR? Kodak Photoresist Kodak Phase Kodak Poly phase None of the above Hint 30). The figure shown below is a structure of __________________ Generator Oscillator Reflex klystron Magnetron Hint 31). The refractive index value of poly-cyclohexyl methacrylate substrate material is ____________ 1.490 1.504 5.43 3.4 Hint 32). The relative dielectric constant of alumina is _______________ 10 20 30 40 Hint 33). The thermal conductivity value of alumina material is ______________ 1.7 0.3 3.7 4.4 Hint 34). The frequency range of magnetron microwave vacuum tube is ________________ 1-25GHz Few GHz to 100 GHz 100GHz 90GHz Hint 35). The output power of magnetron microwave vacuum tube is _______________ 10MW 20MW 30MW Several KW Hint 36). The efficiency of magnetron microwave vacuum tube is less than _______________ 200% 120% 30-60% 10% Hint 37). In which one of the following tubes the field is stationary? Klystron Traveling wave tube Both a and b None of the above Hint 38). What are the advantages of a klystron microwave tube? Has long life Low interpulse noise Wide bandwidth All of the above Hint 39). Which one of the following has less gain and less efficiency? Klystron TWT Both a and b None of the above Hint 40). The frequency range from 4 to 8 GHz is designated as ______________ Ku-band V-band S-band C-band Hint 41). The refractive index value of polyester glass substrate material is _______________ 1.490 1.500 5.43 3.4 Hint 42). The relative dielectric constant of beryllia material is __________________ 10 6 30 40 Hint 43). The thermal conductivity value of beryllia material is ________________ 5.7 6.3 2.5 4.4 Hint 44). The alumina, GaAs, rutile, sapphire, beryllia, glass, garnet/ferrite are the ____________ materials? Substrate Conductor Both a and b None of the above Hint 45). Silver, gold, copper, and aluminum are the type of _____________ materials? Substrate Conductor Both a and b None of the above Hint 46). The Cr-SiO, Ti, Ta, NiCr, Cr are the ____________films? Dielectric Resistive Both a and b None of the above Hint 47). What is the standard form of MMIC? Monolithic Microwave Internal Circuits Monolithic Microwave Integrated Circuits Microwave Monolithic Integrated Circuits None of the above Hint 48). What are the advantages of monolithic microwave integrated circuits? Lightweight Low cost Small size All of the above Hint 49). What is the standard form of PRR? Pulse Radiation Rate Pulse Repetition Rate Pulse Rate Repetition None of the above Hint 50). The frequency range from 8 to 12 GHz is designated as ________ Ku-band V-band X-band W-band Hint Microwave Devices and Circuits MCQs for Quiz 51). The microwave integrated circuits exist in ______________ different forms? Discrete circuit Hybrid MIC MMIC All of the above Hint 52). What is the standard form of MIC? Microwave Integral Circuits Microwave Integrated Circuits Microwave Isolator Circuits None of the above Hint 53). What is the standard form of TWT? Traveling White Tube Traveling Wave Tire Traveling Wave Tube None of the above Hint 54). 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 Hint 55). The refractive index value of crystal quartz substrate material is ________________ 1.540 2.345 5.43 3.4 Hint 56). The frequency-agile coaxial magnetrons are categorized into ___________ types? Two Three Four Five Hint 57). What is the standard form of ECM? Electrical Counter Measures Electronic Counter Machines Electronic Counter Measures None of the above Hint 58). The frequency limitation of the varactor diode is less than ______ GHz? 600 500 400 300 Hint 59). The frequency limitation of Gunn diode is less than ______ GHz? 600 500 400 140 Hint 60). The frequency range from 12 to 18 GHz is designated as _____________ Ku-band K-band Ka-band W-band Hint 61). The refractive index value of polymethyl methacrylate substrate material is _______________ 1.491 1.500 5.43 3.4 Hint 62). The frequency range of the traveling wave tube is _______________ 1-10GHz Few GHz to 100 GHz 100GHz 90GHz Hint 63). The output power of traveling wave tube is ___________ 10MW 20MW 30MW Order of KW Hint 64). The efficiency of traveling wave tube is less than ___________ 200% 120% 30-60% 20% Hint 65). Which one of the following circuits is resonant type? Klystron Traveling wave tube Both a and b None of the above Hint 66). 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 Hint 67). Which one of the following has low power output? Klystron Traveling wave tube Both a and b None of the above Hint 68). Which one of the following has a short life? Klystron Traveling wave tube Both a and b None of the above Hint 69). Which one of the following uses cavities for output and input circuits? Klystron Traveling wave tube Both a and b None of the above Hint 70). The frequency range from 18 to 27 GHz is designated as ______________ V-band K-band Ka-band W-band Hint 71). The refractive index value of zinc crown glass substrate material is ______ 1.491 1.508 5.43 3.4 Hint 72). 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 Hint 73). Which one of the following circuits is non-resonant type? Klystron Traveling wave tube Both a and b None of the above Hint 74). 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 Hint 75). Which one of the following has high power output? Klystron Traveling wave tube Both a and b None of the above Hint Microwave Devices and Circuits MCQs for Interviews 76). Which one of the following has a long life? Klystron Traveling wave tube Both a and b None of the above Hint 77). 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 Hint 78). The magnetrons are categorized into _________ types? One Two Three Four Hint 79). The frequency limitation of IMPact ionization Avalanche Transit-Time diode is less than ______ GHz? 600 500 400 300 Hint 80). The frequency range from 27-40 GHz is designated as ________ L-band C-band Ka-band S-band Hint 81). ______ are the substrate materials for IMPact ionization Avalanche Transit-Time diode? Si GaAs InP All of the above Hint 82). ______ are the substrate materials for Gunn diode? Si GaAs InP Both b and c Hint 83). ______ are the substrate materials for P-I-N diode? Si GaAs InP Both a and b Hint 84). ______ are the substrate materials for varactor diode? Si GaAs InP Both a and b Hint 85). What are the advantages of IMPATT diodes? Low cost, low power supply Reliable Light-weight All of the above Hint 86). What are the advantages of TRAPATT diodes? Low power supply Reliable Low cost All of the above Hint 87). What are the advantages of BARITT diodes? Low power supply Noise is low Low cost, reliable All of the above Hint 88). The frequency limitation of the P-I-N diode is less than ______ GHz? 600 500 400 100 Hint 89). The frequency limitation of FET & HEMT diode is less than ______ GHz? 600 500 400 100 Hint 90). The extra high frequency ranges from __________________ 30GHz to 300GHz 7GHz to 30GHz 0.3GHz to 3GHz 0.1GHz to 3GHz Hint 91). The refractive index value of fused silica substrate material is ________________ 1.458 2.345 5.43 3.4 Hint 92). 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 Hint 93). What is the standard form of HEMT? High Electron Mobility Transistors High Electron Mobility TransformerS High Electron Main Transistors None of the above Hint 94). What is the standard of the YIG device? Yttrium Iron Gunn Yttrium Iron Granet Yttrium Ion Granet None of the above Hint 95). 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 Hint 96). What is the standard form of BWO? Back Wave Oscillator Backward Wave Oscillator Backward Oscillator None of the above Hint 97). Which one of the following has high gain and good efficiency? Klystron TWT Both a and b None of the above Hint 98). What is the standard form of CFA? Control Field Amplifier Common Field Amplifier Cross Field Amplifier None of the above Hint 99). The magnetron and CFA are the two types of _________________ devices? Cross-field Linear beam Both a and b None of the above Hint 100). The frequency range from 75 to 110 GHz is designated as ________ L-band C-band Ka-band W-band Hint Time is Up! Time's up
