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

  • Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line.

    Reason (R): A quarter wave transformer is a transmission line of quarter wave length.


  • 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

  • Correct Answer
  • Both A and R are correct but R is not correct explanation of A 

    Explanation
    A line of length Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line. is called quarter wavelength line. Such a line is used for impedance matching.

    If Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line.

    Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line.

    A quarter wave line can match a source impedance Zin with load impedance ZL by selecting a proper value of Z0 so as to satisfy equation.

    Such a line is also called Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line. transformer.

    Microwave Communication problems

    Search Results

    • 1. The magnitudes of OC and SC input impedances of a transmission line an 100 ? and 25 ?. The characteristic impedance is

    • Options
    • A. 25 ?
    • B. 50 ?
    • C. 75 ?
    • D. 100 ?
      • Discuss
    • 2. Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light.

      Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.


    • 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): PIN diode is commonly used for microwave control.

      Reason (R): A PIN diode uses heavily doped p and n materials.


    • 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. Assertion (A): A backward wave oscillator can be used as a sweep generator.

      Reason (R): The frequency of oscillation of a backward wave oscillator can be changed by varying the voltage which controls the beam velocity.


    • 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
    • 5. In a reflex klystron oscillator, repeller electrode is at

    • Options
    • A. low positive potential
    • B. high positive potential
    • C. negative potential
    • D. zero potential
      • Discuss
    • 6. In a loss line RL < Z0, then

    • Options
    • A. Reflection coefficient is zero
    • B. Reflection coefficient is ?
    • C. Reflection coefficient is negative
    • D. Reflection coefficient is positive
      • Discuss
    • 7. The correct sequence of parts in klystron amplifier are

    • Options
    • A. anode, catcher cavity, cathode, buncher cavity
    • B. cathode, buncher cavity, catcher cavity, cavity
    • C. anode, buncher cavity, catcher cavity, cathode
    • D. cathode, catcher cavity, anode, buncher cavity
      • Discuss
    • 8. Which of the following terminations makes the input impedance of a line equal to characteristic impedance Z0?

    • Options
    • A. line open circuited at far end
    • B. line terminated in Z0
    • C. line short circuited at far end
    • D. line terminated in inductance
      • Discuss
    • 9. A balun should have

    • Options
    • A. low SWR at both ports
    • B. high SWR at both ports
    • C. high SWR at input port and low SWR at output port
    • D. low SWR at input port and high SWR at output
      • Discuss
    • 10. The width of a radio beam from a 1 m diameter parabolic antenna at 1 GHz is about

    • Options
    • A. 100°
    • B. 50°
    • C. 5°
    • D. 2°
      • Discuss

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