Microwave Communication - ECE Questions and Answers

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In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.

True

False

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In TE₁₀mode the largest electric field in a rectangular wave guide, occurs

along centre line of broad wall (i.e. x = a/2)

along the broad wall (i.e. x = 0 and x = a)

either (a) or (b)

neither (a) nor (b)

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Which modes of circular wave guides have circular symmetry?

TE₁₁

TE₁₁ and TE₂₁

TE₀₁

TE₀₁ and TM₀₁

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In rectangular waveguides the ratio of width to height is about

0.5

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If wavelength in free space is λ₀ wavelength in insulator λ, μ_r is relative permittivity or insulator and ∈_r is relative permittivity or insulator, then

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In the given figure the circuits for input impedance of a microwave device with output ports match terminated. The device is

E plane tee

H plane tee

magic tee

hybrid ring

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Which of these statements is correct?

Ridge guide is essentially a form of capacitively loaded guide.

Ridge guide is essentially a form of inductively loaded guide.

Ridge guide is essentially a form of resistively loaded guide.

Ridge guide has higher power handling capacity than rectangular waveguide.

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A rectangular waveguide has width a. Then at the cutoff frequency (with corresponding wave length λ_c)

a = λ_c

a = 2λ_c

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In a rectangular waveguide cutoff wavelength for TE₁₀mode is 8 cm. Then cutoff wavelength for TE₂₀ mode is

8 cm

6 cm

4 cm

2 cm