Standard mismatches are used to calibrate SWR and impedance measuring equipments

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Question
Standard mismatches are used to calibrate SWR and impedance measuring equipments.
Options
A. True
B. False

Correct Answer

True

Microwave Communication problems

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2. Consider the following statements about directional coupler shown in the figure
1. Ports 1 and 2 are decouple
2. Ports 3 and 4 are decoupled
3. Pots 1 and 3 are decoupled
4. Ports 1 and 4 are decoupled
Which of the above statements are correct?
Options
A. 1 and 2 only
B. 3 and 4 only
C. 1, 2 and 3
D. 2, 3 and 4

4. Assertion (A): Hollow waveguides are frequently used as transmission lines at microwave frequencies.
Reason (R): Waveguide has high power handling capacity, low loss and simple structure.
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

7. In a rectangular waveguide
Options
A. the broad width is generally labelled 'a' and height 'b'
B. the broad width is generally labelled 'b' and height 'a'
C. any one of the dimensions may be labelled 'a' and the other 'b'
D. the length is labelled as 'a'

10. The use of coaxial microwave line should be restricted to frequencies
Options
A. below cut off frequency of TE₁₁ mode
B. above cut off frequency of TE₁₁ mode
C. at frequencies much lower than cut off frequency of TE₁₁ mode
D. at frequencies much higher than cut off frequency of TE₁₁ mode

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