Microwave Communication - ECE Questions and Answers

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A line of length slightly less than and short circuited at far end behaves as

inductance L

capacitance C

L and C in series

L and C in parallel

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In TE₁₀ mode of rectangular waveguide

there is one half sine wave variation along x direction and one along y direction

there is one half sine wave variation along y direction and one along x direction

there is one full sine wave variation along x direction and one along y direction

none of the above

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Reflection from the object to be measured is significant only when the wavelength is

much bigger than the size of object

much smaller than the size of object

almost of the size of object

either (a) or (c)

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The speed at which axial electric field due to signal advances in a TWT is equal to

speed of light

(speed of light) (helix pitch helix circumference)

(speed of light) (helix circumference helix pitch)

(speed of light) (helix pitch) (helix circumference)

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To ensure that only dominant TE₁₀ mode propagates in a rectangular waveguide, the operating frequency

must be more than cutoff frequency of TE₁₀ mode

must be less than cutoff frequency of TE₂₀ mode

must be more than cutoff frequency of TE₁₀ mode and less than cutoff frequency of TE₂₀ mode

must be less than cutoff frequency of TE₁₀ mode

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In a microwave power measurement using bolometer, the principle of working is variation of

inductance with absorption of power

resistance with absorption of power

capacitance with absorption of power

cavity dimension with heat generated by power

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Z₀ = (Z_oc Z_sc)^0.5

True

False

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A microwave junction is matched at all ports if the S matrix

has all diagonal elements zero

has all diagonal elements equal but not zero

has all diagonal elements complex

is Hermitian

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Assertion (A): A line of length slightly more than and open circuited at far end is equivalent to an inductive reactance.

Reason (R): A line of length slightly more than and short circuited at far end behaves as a capacitive reactance.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct