# Electronics and Communication Engineering - Microwave Communication

### Exercise :: Microwave Communication - Section 8

11.

In a rectangular waveguide cutoff wavelength for TE10 mode is 8 cm. Then cutoff wavelength for TE20 mode is

 A. 8 cm B. 6 cm C. 4 cm D. 2 cm

Explanation:

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12.

In a coaxial line

 A. the characteristic impedance is less than that of two wire line B. the wave velocity is less than that of two wire line C. both (a) and (b) D. neither (a) nor (b)

Explanation:

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13.

If a and b are the width and height of rectangular wave-guide the cut off wavelength λc for TE20 mode is equal to

 A. a B. a + b C. a - b D. a2 + b2

Explanation:

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14.

A TEM wave is incident normally on a perfect conductor. The E and H fields at boundary will respectively be

 A. minimum and maximum B. minimum and minimum C. maximum and minimum D. maximum and maximum

Explanation:

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15.

The scattering matrix of magic tee is

 A. B. C. D. 