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ECE Objective Questions { Transmission Lines and Waveguides }



29. A 6-GHz wave is being propagated in a parallel-plane waveguide having a plane separation of 3 cm. The cut-off wavelength Xo for dominant mode is ___ cm.
A.6
B.2
C.5
D.12

30. A rectangular or a circular waveguide is
A. a resonant circuit
B. high-phase filter
C. low-pass filter
D. none of the above

31. A standard recangular waveguide has an aspect ratio of
A. 1 : 2
B. 2 : 1
C. 3 . 1
D.03:02

32. In a hollow rectangular waveguide, the phase velocity
A. increases with increasing frequency
B. decreases with increasing frequency
C. is independent of frequency
D. all of the above

33. The cut-off wavelength for the dominant mode TEii in a circular waveguide is
A. 2.1 r
B. 0.894 r
C.r
D. 1.7 d

34. The dominant mode in a rectangular waveguide is
A. TE01
B. TMoi
C. TElo
D. TMII

35. The cut-off frequency of a metal rectangular wave guide of dimensions 2 cm x 1 cm and operating in dominant mode is _____ cm.
A.1
B.2
C.4
D.0

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