Microwave Communication Questions

• The main advantage of TWT over klystron is
• Fields are said to be circularly polarized if
• The frequency of oscillations obtained from a reflex klystron depends mainly on
• Assertion (A): Two equal and opposite travelling waves result in a standing wave. Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.
• In TE and TM modes of rectangular waveguides having propagation in z direction
• Assertion (A): In circular waveguide the attenuation of TE01 mode decreases as the operating frequency increases. Reason (R): The wall currents in a circular waveguide in TEQ1 mode are completely circumferential.
• When a wave reaches an open circuit
• In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is
• Wave guides are pressurised above normal atmospheric pressure for
• Assertion (A): In a power divider SH = 0, S21 = 0.707 = S3, Reason (R): In a power divider the input port (i.e., port 1) is matched and incident power is equally divided in output ports 2 and 3
• The p mode of operation of magnetron signifies that
• Directive gain of elementary doublet is
• Which of the following is used in integrated circuits?
• Which of the following are true for magic tee in the given figure select the answer as per given codes S13 = S23 S14 = S24 S12 = 0 S34 = 0
• A circular waveguide has an infinite set of TE and TM modes.
• In terms of R, L, G and C the propagation constant γ of a transmission line is
• Consider the following statements (L is the length of array between centres of end antennas and A is wave-length) Width of major lobe between nulls of broad side array and end fire array are different. Directive gain of broadside array and end fire array are different. Directive gain of broadside array is 4 Which of the above statements are correct?
• If a microstrip is enclosed in a metal enclosure
• In microwave detector used in laboratory measurements of relative power levels, standing wave ratio is about
• Loading of a line means