Microwave Communication Questions

• In a multicavity klystron amplifier the electron velocity of the order of
• Which of these statements is correct?
• Guide wavelength (λg), cutoff wavelength (λc) and free space wavelength (λ0) of a waveguide are related as
• Which modes of circular wave guides have circular symmetry?
• In a Gunn diode oscillator drift velocity of electron is 107 cm/s and active region length is 10 x 10-4 cm. The natural frequency of oscillation is
• For a given operating frequency a waveguide has more power handling capacity than a coaxial line.
• In a backward wave oscillator the efficiency
• Generally the wall thickness of rectangular waveguide is
• VSWR = Emax/Emin.
• If wavelength in free space is λ0 wavelength in insulator λ, μr is relative permittivity or insulator and ∈r is relative permittivity or insulator, then
• In the given figure the circuits for input impedance of a microwave device with output ports match terminated. The device is
• Assertion (A): Hollow waveguides are frequently used as transmission lines at microwave frequencies. Reason (R): Waveguide has high power handling capacity, low loss and simple structure.
• In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.
• Consider the following statements about directional coupler shown in the figure Ports 1 and 2 are decouple Ports 3 and 4 are decoupled Pots 1 and 3 are decoupled Ports 1 and 4 are decoupled Which of the above statements are correct?
• A 'rat race' is a
• Standard mismatches are used to calibrate SWR and impedance measuring equipments.
• In rectangular waveguides the ratio of width to height is about
• In a rectangular waveguide
• A waveguide twist is used to change the plane of polarization.
• In a rectangular waveguide cutoff wavelength for TE10 mode is 8 cm. Then cutoff wavelength for TE20 mode is