Microwave Communication problems
- 1. As compared to their values in free space
Options- A. velocity of electric wave in dielectric is smaller but wave length of electric wave is more
- B. both velocity and wave length of electric wave in dielectric are higher
- C. both velocity and wave length of electric wave in dielectric are smaller
- D. wave length of electric wave is less but velocity is more in dielectric Discuss
Correct Answer: both velocity and wave length of electric wave in dielectric are smaller
- 2. A rectangular waveguide has a discontinuity in the form of reduced narrow dimension. In the equivalent circuit this discontinuity can be represented by
Options- A. a shunt capacitance at the discontinuity
- B. a shunt inductance at the discontinuity
- C. a shunt resistance at the discontinuity
- D. none of the above Discuss
Correct Answer: a shunt capacitance at the discontinuity
- 3. In an optional fiber the refractive index of cladding material should be
Options- A. nearly 1
- B. very low
- C. less than that of core
- D. more than that of core Discuss
Correct Answer: less than that of core
- 4. What is the numerical aperture an optical fiber when critical angle is 30°?
Options- A. 0.5
- B. 0.704
- C. 0.866
- D. 0.2 Discuss
Correct Answer: 0.5
- 5. If rv is reflection coefficient and VSWR is voltage standing wave ratio, then
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 6. 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
Correct Answer: two third of incident voltage
- 7. 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
Correct Answer: a few ohms and a kilo ohms
- 8. 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
Correct Answer: much lower than microwave range
- 9. 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
Correct Answer: has all diagonal elements zero
- 10. 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
Correct Answer: the electric field lines of radio waves and flux line of earth's magnetic field are in the same direction
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