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  • Question

  • The path length between ports 1 and 2 for the two waves in a hybrid ring is


  • Options
  • A. 1
  • B. The path length between ports 1 and 2 for the two waves in a hybrid ring is 1 The quantities require
  • C. The path length between ports 1 and 2 for the two waves in a hybrid ring is 1 The quantities require
  • D. The path length between ports 1 and 2 for the two waves in a hybrid ring is 1 The quantities require

  • Correct Answer
  •  

    Explanation
    The quantities required to be measured in microwave circuits are frequency, power and impedance.

    Microwave frequency measurement is done by slotted line, resonant cavities and transfer oscillator.

    Microwave power measurement uses bolometers and microwave power meters.

    A self balancing bridge working on the principle of power substitution is commonly used.

    Microwave impedance measurement is done by measurement of reflection coefficient and VSWR.

    A slotted line and probe is a basic tool for these measurements.' Network analyser enables rapid impedance measurement over a broad frequency range.

    Microwave Communication problems

    Search Results

    • 1. As wavelength decrease the size of high directivity antenna

    • Options
    • A. decreases
    • B. increases
    • C. is not affected
    • D. either (b) or (c)
      • Discuss
    • 2. In the given figure forward voltage wave has a magnitude

    • Options
    • A. 90 V
    • B. 60 V
    • C. 30 V
    • D. 10 V
      • Discuss
    • 3. Out of modes TE20 and TE30 of propagation of electromagnetic engery

    • Options
    • A. both have the same cutoff frequency
    • B. TE20 has lower cut off frequency as compared to TE30
    • C. TE30 has lower cutoff frequency as compared to TE20
    • D. either (a) or (c)
      • Discuss
    • 4. The duty cycle of a radar transmitter is equal to

    • Options
    • A. (PRF) (pulse width)
    • B. (PRF)/(pulse width)
    • C. (pulse width)/(PRF)
    • D. (pulse width) + (PRF)
      • Discuss
    • 5. In the given figure a short circuited transmission line resonator If n = 1, 2, 3...

    • Options
    • A. For series reasonance ?l = np and for parallel resonance
    • B. For series resonance and for parallel resonance ?l = np
    • C. ?l = np for both series and parallel resonance
    • D. for both series and parallel resonance
      • Discuss
    • 6. When resonant cavities are coupled together the result is

    • Options
    • A. one resonant frequency
    • B. n resonant frequencies
    • C. resonant frequencies
    • D. either (b) or (c)
      • Discuss
    • 7. At frequencies of 10 MHz and higher the impedance represented by ground is primarity

    • Options
    • A. resistive
    • B. inductive
    • C. capacitive
    • D. partly resistive and partly capacitive
      • Discuss
    • 8. The reverse voltage applied to a varactor diode

    • Options
    • A. is less than avalanche breakdown voltage
    • B. is more than avalanche breakdown voltage
    • C. may be more or less than a avalanche breakdown voltage
    • D. is very high as compared to avalanche breakdown voltage
      • Discuss
    • 9. The skin depth at 1000 MHz as compared to that at 500 MHz is

    • Options
    • A. 2
    • B. 12
    • C. 0.707
    • D. 0.5
      • Discuss
    • 10. In a TWT the amplitude of resultant wave travelling down the helix remains constant

    • Options
    • A. True
    • B. False
      • Discuss

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