51. Which one of the following is a negative differential resistance diode?
52. A TEM mode transmission line is having distributed circuit parameters as R = 1 ohm/m, L = 200 nH/m, G = 300 µS/m, C = 60 pF, the line is:
53. The given equivalent circuit belongs to:

54. Wavelength of the visible light extends from
55. The microwave tube that uses buncher and catcher cavities is
56. The negative resistance of the tunnel diode occurs when the bias voltage is
57. When microwave signals follow the curvature of the earth, this is known as-
58. In a reflex klystron, the velocity modulation
59. Electric Field and Magnetic Field are perpendicular to each other in:
60. What is range of UHF?
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