Test: Waveguides - Electronics and Communication Engineering (ECE) MCQ
20 Questions MCQ Test - Test: Waveguides
Consider a 150 m long air-filled hollow rectangular wave guide with cutoff frequency 6.5 GHz. If a shortpulse of 7.2 GHz is introduced into the input end of theguide, the time taken by the pulse to return the inputend is
In an air-filled rectangular waveguide the cutoff frequencies for TM11 and TE03 modes are both equal to 12 GHz.
Que: The dominant mode is
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In an air-filled rectangular waveguide the cutoff frequencies for TM11 and TE03 modes are both equal to 12 GHz.
Que:At dominant mode the cutoff frequency is
For an air-filled rectangular waveguide given that
If the waveguide has cross-sectional dimension a = 6 cm and b = 3 cm, then the intrinsic impedance of this mode is
In an air-filled waveguide, a TE mode operating at 6 GHz has
Que: The cutoff frequency is
In an air-filled waveguide, a TE mode operating at 6 GHz has
Que: The intrinsic impedance is
Consider an air-filled rectangular wave guide with a = 2.286 cm and b = 1.016 cm. The y-component of the TE mode is
Que: The propagation constant γ is
Consider an air-filled rectangular wave guide with a = 2.286 cm and b = 1.016 cm. The y-component of the TE mode is
Que: The intrinsic impedance is
Consider a air-filled waveguide operating in the TE12 mode at a frequency 20% higher than the cutoff frequency.
Que: The phase velocity is
Consider a air-filled waveguide operating in the TE12 mode at a frequency 20% higher than the cutoff frequency.
Que: The group velocity is
A rectangular waveguide is filled with a polyethylene ( εr = 2.25 ) and operates at 24 GHz. The cutoff frequency of a certain mode is 16 GHz. The intrinsic impedance of this mode is
own in fig. It has dielectric discontinuity as shown in fig. If the guide operate at 8 GHz in the dominant mode, the standing wave ratio is
Consider the rectangular cavity as shown in fig.
Que: If a < b < c, the dominant mode is
Consider the rectangular cavity as shown in fig.
Que: If a > b > c, then the dominant mode is
Consider the rectangular cavity as shown in fig.
Que: If a = c > b, then the dominant mode is
The air filled cavity resonator has dimension a = 3 cm, b = 2 cm, c = 4 cm. The resonant frequency for the TM110 mode is
A 6 cm x 4 cm rectangular wave guide is filled with dielectric of refractive index 1.25
Que: The range of frequencies over which single mode operation will occur is
A 6 cm x 4 cm rectangular wave guide is filled with dielectric of refractive index 1.25
Que: The range of frequencies, over which guide support both TE10 and TE01 modes and no other, is
Two identical rectangular waveguide are joined end to end where a = 2b. One guide is air filled and other is filled with a lossless dielectric of εr. it is found that up to a certain frequency single mode operation can be simultaneously ensured in both guide. For this frequency range, the maximum allowable value of εr is
A parallel-plate guide operates in the TEM mode only over the frequency range 0 < f < 3 GHz. The dielectric between the plates is teflon (εr = 2.1) .The maximum allowable plate separation b is
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