Microwave Communication problems
- 1. In a microwave power measurement using bolometer, the principle of working is variation of
Options- A. inductance with absorption of power
- B. resistance with absorption of power
- C. capacitance with absorption of power
- D. cavity dimension with heat generated by power Discuss
Correct Answer: resistance with absorption of power
- 2. In a loss less line the propagation constant is equal to
Options- A. j?LC
- B. LC
- C. j?LC
- D. LC Discuss
Correct Answer: j?LC
- 3. The primary constants of a transmission line are
Options- A. R and L
- B. R, L and C
- C. R and C
- D. R, L, G and C Discuss
Correct Answer: R, L, G and C
- 4. Reflection from the object to be measured is significant only when the wavelength is
Options- 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) Discuss
Correct Answer: much smaller than the size of object
- 5. The total power radiated from an antenna system is determined by imagining that the antenna is at the centre of a very large
Options- A. sphere
- B. rectangle
- C. square
- D. ellipse Discuss
Correct Answer: sphere
- 6. In TE10 mode of rectangular waveguide
Options- 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 Discuss
Correct Answer: there is one half sine wave variation along x direction and one along y direction
- 7. A line is excited by a 100 V, 200 ohm source and is terminated by 100 ? resistance. If the voltage on line reaches steady value in 80 ns, the natural resonant frequency is
Options- A. 100 MHz
- B. 50 MHz
- C. 12.5 MHz
- D. 6.25 MHz Discuss
Correct Answer: 12.5 MHz
- 8. TE01 mode of propagation of electromagnetic energy
Options- 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) Discuss
Correct Answer: is merely the TE10 mode rotated 90°
- 9. For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about
Options- A. 1000 MHz
- B. 5000 MHz
- C. 14000 MHz
- D. 140000 MHz Discuss
Correct Answer: 14000 MHz
- 10. A PIN diode can be used
Options- A. as a shunt mounted switch
- B. as a series mounted switch
- C. both as series or shunt mounted switch
- D. non of the above Discuss
Correct Answer: both as series or shunt mounted switch
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