162. A wave propagating in a waveguide has a full wavelength of electric intensity change between the two walls that are fartherapart. It has no component of electric field along the direction of propagation. The mode is
A. TEI 0
B. TMII
C. TE20
D. TEii

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163. Electromagnetic wave propagation is associated with two different velocities namely the group velocity (Dg) and the phase velocity (up). In case of wave propagation in free space
A. u equal u
B. ug is greater than u .
C. 0g Is smaller than u
D. none of these

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164. For a lossless rectangular waveguide, the operating frequency is 25 percent more than the cut-off frequency for the propagating mode that is transverse electric in nature. The wave iimpedance in the waveguide is
A. 120 it ohms
B. 72 TE ohms
C. 200 11 ohms
D. none of these

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165. Wave number (K) and the criticalwave number (1{c) and interrelated by
A. Kc = jo) 2+ K2
B. Kc (021.16 K2
C. K2 = co2tte _K2
D. none of these

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166. If the phase-shift constant (0) becomes imaginary in a certain case,
A. the wave connot be propagated and gets attenuated instead
B. oscillations are set up within the waveguide
C. the wave cannot exist
D. none of these

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167. A coupling probe is placed at a point
A. where the electrical field has maximum intensity
B. where the magnetic field has maximum intensity
C. where the electrical field has the least value none of these
D. none of these

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168. Loop coupling is
A. electrostatic
B. magnetic
C. either magnetic or electrostatic
D. none of these

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