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  • Question

  • A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the frequency is 3 GHz, and b = 1 cm.


  • Options
  • A. 49
  • B. 47.33
  • C. 50.33
  • D. 50

  • Correct Answer
  • 47.33 

    Explanation
    A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the fr

    Since, wave is attenuated hence ? = 0

    and A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the fr Take, dominant mode m = 1,

    n = 0

    A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the fr .

    Electromagnetic Field Theory problems

    Search Results

    • 1. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls Calculate group velocity for dominant mode.

    • Options
    • A. 1.8 x 108 m/sec
    • B. 5 x 108 m/sec
    • C. 3 x 108 m/sec
    • D. 1.5 x 108 m/sec
      • Discuss
    • 2. Charge needed within a unit sphere centred at the origin for producing a potential field,

    • Options
    • A. 12 pc
    • B. 60 pc
    • C. 120 pc
    • D. 180 pc
      • Discuss
    • 3. In a 100 turn coil, if the flux through each turn is (t3 - 2t)mWb, the magnitude of the induced emf in the coil at a time of 4 sec is

    • Options
    • A. 46 mV
    • B. 56 mV
    • C. 4.6 V
    • D. 5.6 V
      • Discuss
    • 4. Calculate wave impedance for TE mode

    • Options
    • A. (377)?
    • B. 226 ?
    • C. ?
    • D. 629 ?
      • Discuss
    • 5. If aac for transistor is 0.98 then ?ac is equal to

    • Options
    • A. 51
    • B. 49
    • C. 47
    • D. 45
      • Discuss
    • 6. A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is

    • Options
    • A. increased by a factor of 9
    • B. increased by a factor of 3
    • C. unchanged
    • D. reduced by a factor of 1/3
      • Discuss
    • 7. Find the noise factor for an antenna at 27°C with equivalent noise temperature 30°K

    • Options
    • A. 20
    • B. 100
    • C. 300
    • D. 1.1
      • Discuss
    • 8. Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 1014 Hz in glass. Assume velocity of light is 3 x 108 m/sec in vacuum.

    • Options
    • A. 4 ?m
    • B. 3 ?m
    • C. 2 ?m
    • D. 1 ?m
      • Discuss
    • 9. A short circuited stub is shunt connected to a transmission line as shown in the figure is, if z0 = 500 ohms, the admittance y seen at the function of the stub and the transmission line is

    • Options
    • A. (0.01 - j 0.02) mho
    • B. (0.02 - j 0.01) mho
    • C. (0.04 - j 0.02) mho
    • D. (0.02 + j 0) mho
      • Discuss
    • 10. Which of the following should dominant wave have?

    • Options
    • A. Lowest cut off frequency
    • B. Highest cut off frequency
    • C. No attenuation
    • D. No phase shift
      • Discuss

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