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Home ‣ Electronics and Communication Engineering ‣ Microwave Communication Comments
  • Question

  • 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

  • Correct Answer
  • a shunt capacitance at the discontinuity 

    • Microwave Communication problems

    Search Results

    • 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
    • 2. Assertion (A): Inter-digitated geometry is widely used for microwave transistors.

      Reason (R): Tuning at input and output of transistor uses MOS chip capacitors.


    • 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
      • Discuss
    • 3. Assertion (A): Slotted line is frequently used for microwave measurements.

      Reason (R): The unknown impedance is mounted at the end of slotted line.


    • 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
      • Discuss
    • 4. Depth of penetration does not depend on frequency.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. In directional coupler of the given figure, the terms |S14| and |S23| of scattering matrix are nearly

    • Options
    • A. 1 each
    • B. 0.5 each
    • C. 0.1 each
    • D. 1 and 0.5 respectively
      • Discuss
    • 6. 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
    • 7. 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
    • 8. If rv is reflection coefficient and VSWR is voltage standing wave ratio, then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. 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
    • 10. 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

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