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- Question
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
- Correct Answer
- resistance with absorption of power
- 1. The effect of earth's magnetic field on radiowaves is minimum when
Options- A. the electric field lines of radio waves and flux line of earth's magnetic field are in the same direction
- B. the electric field lines of radio waves and flux lines of earth's magnetic field are at right angles
- C. the electric field lines of radiowaves and flux lines of earth's magnetic field oppose each other
- D. both (b) and (c) Discuss
- 2. A microwave junction is matched at all ports if the S matrix
Options- A. has all diagonal elements zero
- B. has all diagonal elements equal but not zero
- C. has all diagonal elements complex
- D. is Hermitian Discuss
- 3. The AM, PM, and TV broadcast frequencies are
Options- A. of the same order as microwave range
- B. much lower than microwave range
- C. much higher than microwave range
- D. either (a) or (c) Discuss
- 4. The resistance values of a PIN diode under positive bias and negative bias respectively are about
Options- A. a few ohms and a kilo ohms
- B. about 100 ohms and 1000 ohms
- C. about 0.1 ohm and 100 ohms
- D. about 1000 ohms and 10000 ohms Discuss
- 5. A line of characteristic impedance Z0 branches into two line each with characteristic impedance Z0. The refracted voltage is
Options- A. zero
- B. infinite
- C. equal to incident voltage
- D. two third of incident voltage Discuss
- 6. In a loss less line the propagation constant is equal to
Options- A. j?LC
- B. LC
- C. j?LC
- D. LC Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Microwave Communication problems
Search Results
Correct Answer: the electric field lines of radio waves and flux line of earth's magnetic field are in the same direction
Correct Answer: has all diagonal elements zero
Correct Answer: much lower than microwave range
Correct Answer: a few ohms and a kilo ohms
Correct Answer: two third of incident voltage
Correct Answer: j?LC
Correct Answer: R, L, G and C
Correct Answer: much smaller than the size of object
Correct Answer: sphere
Correct Answer: there is one half sine wave variation along x direction and one along y direction
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