# Electronics and Communication Engineering - Microwave Communication

### Exercise :: Microwave Communication - Section 6

31.

TE01 mode of propagation of electromagnetic energy

 A. is merely the TE10 mode rotated 90° B. is merely the TE10 mode rotated 180° C. is the same as TE10 mode D. either (b) or (c)

Answer: Option A

Explanation:

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32.

Assertion (A): Slotted line is frequently used for microwave measurements.

Reason (R): The unknown impedance is mounted at the end of slotted line.

 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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33.

Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have

 A. reduced losses B. high bandwidth C. reduced losses and low bandwidth D. more losses and low bandwidth

Answer: Option D

Explanation:

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34.

The following components are used to measure power output of a 2 kW TWT amplifier

1. TWT
2. Low pass/High pass filter
3. Low power 20 dB attenuator
4. 40 dB directional coupler with matched load
5. Power meter.
The correct sequence of connections of these components is:

 A. 1, 4, 2, 3, 5 B. 1, 3, 4, 2, 5 C. 1, 2, 4, 3, 5 D. 1, 4, 3, 2, 5

Answer: Option B

Explanation:

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35.

Which part of radio spectrum is more crowded?

 A. Lower frequency part B. Higher frequency part C. Both (a) and (b) D. None of these

Answer: Option D

Explanation:

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