Electronics and Communication Engineering - Microwave Communication
Exercise :: Microwave Communication - Section 6
| 21. |
What is the numerical aperture an optical fiber when critical angle is 30°? |
Answer: Option A
Explanation:
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| 22. |
A line of length slightly less than  and short circuited at far end behaves as |
| A. |
inductance L | | B. |
capacitance C | | C. |
L and C in series | | D. |
L and C in parallel |
Answer: Option A
Explanation:
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| 23. |
In TE10 mode of rectangular waveguide |
| A. |
there is one half sine wave variation along x direction and one along y direction | | B. |
there is one half sine wave variation along y direction and one along x direction | | C. |
there is one full sine wave variation along x direction and one along y direction | | D. |
none of the above |
Answer: Option A
Explanation:
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| 24. |
Reflection from the object to be measured is significant only when the wavelength is |
| A. |
much bigger than the size of object | | B. |
much smaller than the size of object | | C. |
almost of the size of object | | D. |
either (a) or (c) |
Answer: Option B
Explanation:
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| 25. |
The speed at which axial electric field due to signal advances in a TWT is equal to |
| A. |
speed of light | | B. |
(speed of light) (helix pitch helix circumference) | | C. |
(speed of light) (helix circumference helix pitch) | | D. |
(speed of light) (helix pitch) (helix circumference) |
Answer: Option B
Explanation:
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