21. For transverse electric waves between parallel plates, the lowest value of m, without making all the field components zero, is equal to
22. Which of the following devices can be used as low power oscillator only?
23. For which of the following reasons, the coupling between the tunnel diode and its cavity is kept loose?
24. Which statement is false about micro-strip line over strip-line?
25. A balun transformer gives an impedance transformation of
26. At microwave frequencies, we prefer waveguides to transmission lines for transporting EM energy because of all the following except that
27. In a travelling wave tube, the phase velocity of the axial components of the field of the slow wave structure is kept
28. Which of the following parameters is used in RF design?
29. For a cavity resonator with, Q0 = unloaded Q and ρ = standing wave ratio, Qe = the loaded Q is given by
30. A two terminal negative resistance device that can be employed in an amplifier oscillator (or) switch.
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