Microwave Communication Questions

• Effect of loading of line is
• If the repeller voltage in a klystron oscillator is increased the transit time of electron
• In a magnetron the magnetic flux density is of the order of
• Assertion (A): Bolometer is frequently used in microwave power measurement. Reason (R): In a bolometer the input microwave power causes a change in resistance.
• The rotation of direction of E field of a linearly polarized wave passing through a magnetised ferric medium is called
• The Q factor of a waveguide resonator is given by (ω0 is resonant frequency, U is energy storage and WL is the power loss)
• A microstrip line has ∈r = 9. The normalised wavelength is about
• In the given figure the line voltage after a number of reflections will be
• The first and second subscripts in models of circular waveguides depict
• Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2a x a
• In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased?
• As regards rectangular and circular waveguides
• Consider the following statements about instrument landing system of aircraft It ensures correct landing under conditions of low visibility. It consists of runaway localizer, glide path equipment and marker beacons. It is basically a blind landing system. Which of above statements are correct?
• For air filled circular waveguides
• The attenuation characteristics of a loaded line is similar to that of
• In a microwave coaxial cable the inner conductor radius is a and inner radius of outside conductor is b. For TE11 mode the cut off wavelength is about
• Radar is essentially an echo ranging system
• A directional coupler is used to determine
• A TR (transmitter receiver) tube has
• Assertion (A): In TE10 mode the cutoff frequency of rectangular waveguide is where a is the broad dimension and c is velocity of light. Reason (R): TE10 mode is the dominant mode in rectangular waveguide.