For a directional coupler the power is in the ratio of 40 dB 30 dB 20 dB 10 dB

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Question
For a directional coupler the power is in the ratio of
Options
A. 40 dB
B. 30 dB
C. 20 dB
D. 10 dB

Correct Answer

20 dB

Microwave Communication problems

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1. If ?_r is relative permeability, ?_r is relative permittivity, c is velocity of light f_c is cutoff frequency, phase velocity v_p (i.e., speed with which a particular phase of the wave travels down a rectangular waveguide at frequency f) is given by
Options
A.
B.
C.
D.

3. In Gunn diode electrons are transferred from
Options
A. Ridge guide is essentially a form of capacitively loaded guide
B. low to high mobility energy bands
C. valley to domain formation
D. domain to valley formation

6. In a high frequency coaxial line and the length of line characteristic impedance is a function of
Options
A. properties of insulating material only
B. inner and outer conductor radius only
C. both (a) and (b)
D. neither (a) nor (b)

8. In which of the following devices can the operation be visualised in terms of a series feedback loops?
Options
A. TWT
B. Reflex klystron
C. Klystron amplifier
D. Backward wave oscillator

9. Assertion (A): In TE mode for rectangular waveguide.
Reason (R): In TM mode for rectangular waveguide.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

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