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Electronics and Communication Engineering - Microwave Communication

Exercise : Microwave Communication - Section 2
26.
For a circular wave guide
cutoff frequency for TE10 and TE01 modes are same
cutoff frequency for TE10 and TE01 modes are different
cutoff frequency for TE10 mode = twice the cutoff frequency for TE20 mode
cutoff frequency for TE10 mode = haf the cutoff frequency for TE20 mode
Answer: Option
Explanation:

When a circular waveguide is rotated by 90°, the configuration remain the same.

27.
In the given figure the reflected voltage wave after first reflection is
18 V
-18 V
30 V
-30 V
Answer: Option
Explanation:

.

28.

Assertion (A): A half wavelength line can be used as a 1 : 1 transformer.

Reason (R): The input impedance of a half wavelength line is equal to load impedance.

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
Answer: Option
Explanation:

Since a half wavelength line has an input impedance equal to load impedance, the impedance transformation ratio is 1:1.

29.
The magnitudes of OC and SC input impedances of a transmission line an 100 Ω and 25 Ω. The characteristic impedance is
25 Ω
50 Ω
75 Ω
100 Ω
Answer: Option
Explanation:

30.
A loss less line is terminated in a circular lines are E lines
SWR = 0
SWE = 0
SWR is finite
SWR = ∞
Answer: Option
Explanation:

= finite number and VSWR = finite number.

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