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Electronics and Communication Engineering
‣
Microwave Communication
Comments
Question
In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.
Options
A. True
B. False
Correct Answer
True
Microwave Communication problems
Search Results
1.
Assertion (A):
Hollow waveguides are frequently used as transmission lines at microwave frequencies.
Reason (R):
Waveguide has high power handling capacity, low loss and simple structure.
Options
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
Show Answer
Scratch Pad
Discuss
Correct Answer: Both A and R are correct and R is correct explanation of A
2. In the given figure the circuits for input impedance of a microwave device with output ports match terminated. The device is
Options
A. E plane tee
B. H plane tee
C. magic tee
D. hybrid ring
Show Answer
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Discuss
Correct Answer: hybrid ring
3. If wavelength in free space is ?
0
wavelength in insulator ?, ?
r
is relative permittivity or insulator and ?
r
is relative permittivity or insulator, then
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
4. VSWR = E
max
/E
min
.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
5. Generally the wall thickness of rectangular waveguide is
Options
A. about 1-5 mils
B. about 40-100 mils
C. about 0.1 to 0.5 mils
D. about 500 mils
Show Answer
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Discuss
Correct Answer: about 40-100 mils
6. Consider the following statements about directional coupler shown in the figure
Ports 1 and 2 are decouple
Ports 3 and 4 are decoupled
Pots 1 and 3 are decoupled
Ports 1 and 4 are decoupled
Which of the above statements are correct?
Options
A. 1 and 2 only
B. 3 and 4 only
C. 1, 2 and 3
D. 2, 3 and 4
Show Answer
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Discuss
Correct Answer: 1 and 2 only
7. A 'rat race' is a
Options
A. hybrid junction for microwaves
B. a microwave oscillator
C. a microwave amplifier
D. a microwave antenna
Show Answer
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Discuss
Correct Answer: hybrid junction for microwaves
8. Standard mismatches are used to calibrate SWR and impedance measuring equipments.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
9. In rectangular waveguides the ratio of width to height is about
Options
A. 0.5
B. 1
C. 2
D. 4
Show Answer
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Discuss
Correct Answer: 2
10. In a rectangular waveguide
Options
A. the broad width is generally labelled '
a
' and height '
b
'
B. the broad width is generally labelled '
b
' and height '
a
'
C. any one of the dimensions may be labelled '
a
' and the other '
b
'
D. the length is labelled as '
a
'
Show Answer
Scratch Pad
Discuss
Correct Answer: the broad width is generally labelled '
a
' and height '
b
'
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