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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.

    More questions

    • 1. A radar has a maximum range of 120 km. The maximum allowable pulse repetition frequency for unambiguous reception is

    • Options
    • A. 1250
    • B. 330
    • C. 2500
    • D. 8330
      • Discuss
    • 2. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The input resistance of the detector is

    • Options
    • A. 114 kW
    • B. 336 kW
    • C. 384 kW
    • D. 455 kW
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    • Options
    • A. 0.02
    • B. 0.5
    • C. 4.9
    • D. 48
      • Discuss
    • 4. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then

    • Options
    • A. the majority carrier density is doubled
    • B. the minority carrier density is doubled
    • C. the minority carrier density becomes 4 times the original value
    • D. both the majority and minority carrier densities double
      • Discuss
    • 5. A cycloconverter is

    • Options
    • A. ac-dc converter
    • B. dc-ac converter
    • C. dc-dc converter
    • D. ac-ac converter
      • Discuss
    • 6. Consider the following DO statement in Fortran 77

      DO 52 N = 1, 10, 3

      The number of DO loop executions in the above statement is

    • Options
    • A. 1
    • B. 10
    • C. 3
    • D. 4
      • Discuss
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    • Options
    • A. sinusoidal
    • B. nearly constant
    • C. absolutely constant
    • D. rectangular
      • Discuss
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    • Options
    • A. ton and toff are almost equal
    • B. ton >> toff
    • C. toff >> ton
    • D. ton is about twice toff
      • Discuss
    • 9. Which inverter circuit uses coupled inductors?

    • Options
    • A. Modified McMurray full bridge inverter
    • B. McMurray Bedford half bridge inverter
    • C. Modified McMurray Bedford half bridge inverter
    • D. Both (b) and (c)
      • Discuss
    • 10. If there are no permanent dipoles in a dielectric material, the dielectric constant is independent of temperature.

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

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