Discussion
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- Question
For a rectangular waveguide having width a and height b, the cutoff wavelength for TM11 mode is equal to
Options- A.
- B.
- C.
- D.
- Correct Answer
-
- 1. A circular polarizer converts a linearly polarized wave into a circularly polarised wave.
Options- A. True
- B. False Discuss
- 2. In a circular waveguide with radius r, the dominant mode is
Options- A. TM01
- B. TE01
- C. TM11
- D. TE11 Discuss
- 3. Consider the following time parameters
- Domain growth time constant.
- Transit time.
- Dielectric relaxation time in positive mobility regime.
Options- A. 1, 2, and 3
- B. 1 and 2 only
- C. 1 and 3 only
- D. 2 and 3 only Discuss
- 4. A disadvantage of microstrip line as the connections of compared to strip line is that former
Options- A. do not lend themselves to printed circuit
- B. are more likely to radiate
- C. are bulky
- D. are more expensive and complex Discuss
- 5. A radar has a maximum range of 120 km. The maximum allowable pulse repetition frequency for unambiguous reception is
Options- A. 1250
- B. 330
- C. 2500
- D. 8330 Discuss
- 6. A circular waveguide carries TE11 mode whole radial electric field is given by
Er = E0j1(r) sin ? V/m
where r is radial distance in cm from the axis
The cut off wavelength is
Options- A. 10 cm
- B. 3 p cm
- C. 2 p cm
- D. 8 cm Discuss
- 7. A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is
Options- A. 25 ?
- B. 50 ?
- C. 225 ?
- D. 250 ? Discuss
- 8. As frequency increases, the transmission efficiency
Options- A. decreases
- B. increases
- C. is not affected
- D. either (a) or (c) Discuss
- 9. A parametric amplifier uses
Options- A. non linear resistance
- B. non linear reactance
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
- 10. Effect of loading of line is
Options- A. increase in Z0, a and ?
- B. increase in Z0 and ? but decrease in a
- C. decrease in Z0, a and ?
- D. decrease in Z0 and ? but increase in a Discuss
Microwave Communication problems
Search Results
Correct Answer: True
Correct Answer: TE01
Explanation:
Some applications require dual polarization capability. Circular waveguide has this capability.
These analysis uses cylindrical coordinates.
In circular waveguide TE11 mode has the lowest cut off frequency and is the dominant mode.
If D is diameter of waveguide
?c = 1.706 D for TE11 mode
?c = 1.029 D for TE21 mode
?c = 0.82 D for TE01 mode
?c = 1.306 D for TM01 mode.
Correct Answer: 1, 2, and 3
Correct Answer: are more likely to radiate
Correct Answer: 1250
Correct Answer: 10 cm
Correct Answer: 225 ?
Explanation:
rv 
and VSWR 
.
and VSWR .
Correct Answer: increases
Correct Answer: non linear reactance
Explanation:
In a parametric amplifier the non-linear element is varactor diode or inductor.
Correct Answer: increase in Z0 and ? but decrease in a
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