# Electronics and Communication Engineering - Microwave Communication

Exercise : Microwave Communication - Section 7
46.

Assertion (A): Two equal and opposite travelling waves result in a standing wave.

Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.

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
Explanation:
No answer description is available. Let's discuss.

47.
When a wave reaches an open circuit
the voltage at termination is doubled the incident voltage
the current at termination is doubled the incident voltage
the voltage at termination is zero
both V and I at termination are doubled the incident voltage and current
Explanation:
No answer description is available. Let's discuss.

48.

Assertion (A): In circular waveguide the attenuation of TE01 mode decreases as the operating frequency increases.

Reason (R): The wall currents in a circular waveguide in TEQ1 mode are completely circumferential.

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
Explanation:
No answer description is available. Let's discuss.

49.
Consider the following statements
1. Usable bandwidth of ridge wave guide is more than that of rectangular waveguide.
2. For a given value of TM10 cutoff frequency the cross section of ridge wave guide is lesser that that of rect angular waveguide.
3. Ridge wave guide has higher conductor losser than a rectangular waveguide.
4. Ridge guide has higher conductor losser than a rectangular waveguide.
Which of the above statements are correct?
1 and 2 only
1, 2 and 3 only
2 and 3 only
All