Microwave Communication - ECE Questions and Answers

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A TE₁₀ rectangular waveguide is to be designed for operation over 25-35 GHz and the band centre is 1.5 times the cutoff frequency. The dimension of broadside is

15 mm

10 mm

9 mm

7.5 mm

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In a klystron amplifier the force on all electrons

causes acceleration of all electrons

causes retardation of all electrons

causes acceleration of some electrons and retardation of others

none of the above

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If load impedance Z_L >> Z₀, then

Z₀ = Z_L (VSWR)

Z_L = Z₀ (VSWR)

Z_L = Z₀ (VSWR - 1)

Z_L = Z₀ VSWR

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The inductance of a twin feeder used to connect antenna to TV receiver is about

0.2 μ H/m

0.6 μ H/m

1.6 μ H/m

10 μ H/m

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When resonant cavities are coupled together the result is

one resonant frequency

n resonant frequencies

resonant frequencies

either (b) or (c)

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For a rectangular waveguide having width a and height b, the cutoff wavelength for TM₁₁ mode is equal to

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The path length between ports 1 and 2 for the two waves in a hybrid ring is

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The radiation resistance of a circular loop of one turn is 0.01 ohm. For 5 turn loop the radiation resistance is

0.002 Ω

0.01 Ω

0.05 Ω

0.25 Ω

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As wavelength decrease the size of high directivity antenna

decreases

increases

is not affected

either (b) or (c)