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Home ‣ Electronics and Communication Engineering ‣ Microwave Communication See What Others Are Saying!
  • Question

  • Assertion (A): A half wavelength line can be used as a 1 : 1 transformer.

    Reason (R): The input impedance of a half wavelength line is equal to load impedance.


  • 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 and R is correct explanation of A 

    Explanation
    Since a half wavelength line has an input impedance equal to load impedance, the impedance transformation ratio is 1:1.

    More questions

    • 1. In the given figure forward voltage wave has a magnitude

    • Options
    • A. 90 V
    • B. 60 V
    • C. 30 V
    • D. 10 V
      • Discuss
    • 2. During forward blocking state of SCR, the voltage and current respectively are

    • Options
    • A. high and high
    • B. low and low
    • C. high and low
    • D. low and high
      • Discuss
    • 3. Match the following:

      List I List II
      A. CTFS 1. Periodic
      B. DTFS 2. Non-periodic
      C. CTFT
      D. DTFT


    • Options
    • A. A-2, B-1, C-2, D-2
    • B. A-2, B-1, C-2, D-1
    • C. A-1, B-2, C-2, D-2
    • D. A-1, B-2, C-2, D-1
      • Discuss
    • 4. For the system in the given figure. The transfer function C(s)/R(s) is

    • Options
    • A. G1 + G2 + 1
    • B. G1 G2 + 1
    • C. G1 G2 + G2 + 1
    • D. G1 G2 + G1 + 1
      • Discuss
    • 5. In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is

    • Options
    • A. 20 A
    • B. 13.33 A
    • C. 6.67 A
    • D. 3.33 A
      • Discuss
    • 6. In the given figure the ratio T/d is the duty factor.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. In van der walls crystals, there exists a high degree of stability of the outer electron shell.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. If ?r' and ?r" are the real and imaginary parts of complex dielectric constant ?r, and ? is the loss angle. Then

    • Options
    • A.
    • B.
    • C. tan ? = ?'?"
    • D. tan ? = 1 - ?'
      • Discuss
    • 9. The passband of the tuned circuits of a radio receiver should be equal to

    • Options
    • A. 20 kHz
    • B. 455 kHz
    • C. 1455 kHz
    • D. more than 455 kHz
      • Discuss
    • 10. In a radio receiver with simple AGC

    • Options
    • A. the highest AGC voltage is produced between stations
    • B. the faster the AGC time constant, the more accurate the output
    • C. an increase in signal strength produces more AGC
    • D. the audio stage gain is normally controlled by AGC
      • Discuss

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