logo

CuriousTab

CuriousTab

Discussion

Home ‣ Electronics and Communication Engineering ‣ Electromagnetic Field Theory Comments
  • Question

  • 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

  • Correct Answer
  • 1.8 x 108 m/sec 

    Explanation
    Vg . Vp = C2

    where A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls Calcu

    A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls Calcu.

    Electromagnetic Field Theory problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Calculate wave impedance for TE mode

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

    • Options
    • A. 51
    • B. 49
    • C. 47
    • D. 45
      • Discuss
    • 5. Which of the following is true as regards photo emission?

    • Options
    • A. Velocity of emitted electrons is dependent on light intensity
    • B. Rate of photo emission is inversely proportional to light intensity
    • C. Maximum velocity of electron increases with decreasing wave length
    • D. Both holes and electrons are produced
      • Discuss
    • 6. 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
      • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.