Electronics and Communication Engineering - Microwave Communication

26. 

To ensure that only dominant TE10 mode propagates in a rectangular waveguide, the operating frequency

A. must be more than cutoff frequency of TE10 mode
B. must be less than cutoff frequency of TE20 mode
C. must be more than cutoff frequency of TE10 mode and less than cutoff frequency of TE20 mode
D. must be less than cutoff frequency of TE10 mode

Answer: Option C

Explanation:

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27. 

In a microwave power measurement using bolometer, the principle of working is variation of

A. inductance with absorption of power
B. resistance with absorption of power
C. capacitance with absorption of power
D. cavity dimension with heat generated by power

Answer: Option B

Explanation:

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28. 

Z0 = (Zoc Zsc)0.5

A. True
B. False

Answer: Option A

Explanation:

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29. 

A microwave junction is matched at all ports if the S matrix

A. has all diagonal elements zero
B. has all diagonal elements equal but not zero
C. has all diagonal elements complex
D. is Hermitian

Answer: Option A

Explanation:

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30. 

Assertion (A): A line of length slightly more than and open circuited at far end is equivalent to an inductive reactance.

Reason (R): A line of length slightly more than and short circuited at far end behaves as a capacitive reactance.

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

Answer: Option B

Explanation:

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