Electronics and Communication Engineering - Microwave Communication

41. 

A microwave connector should have high SWR.

A. True
B. False

Answer: Option B

Explanation:

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42. 

Assertion (A): A small section of high impedance line is equivalent to a series inductance.

Reason (R): A small section of a low impedance line is equivalent to a series resistance.

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 C

Explanation:

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43. 

Assertion (A): Bolometer is frequently used in microwave power measurement.

Reason (R): In a bolometer the input microwave power causes a change in resistance.

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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44. 

The radiation resistance of a doublet antenna of length dl is proportional to

A. δ l
B. l)2
C. l)3
D. l)05

Answer: Option B

Explanation:

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45. 

Which of the following statements is not correct regarding modes of electromagnetic energy transmission?

A. In TE mode the direction of electric field is always and everywhere transverse to the direction of propagation
B. In TM mode the magnetic field pattern is always and everywhere transverse to the direction of propagation
C. The subscripts is TE and TM designations denote the number of half sine wave variations of the field components in x and y directions respectively.
D. TM11 is called the dominant mode.

Answer: Option D

Explanation:

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