logo

CuriousTab

CuriousTab

Discussion

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

  • Which TM mode in rectangular waveguide has lowest cutoff frequency?


  • Options
  • A. TM11
  • B. TM01
  • C. TM10
  • D. TM21

  • Correct Answer
  • TM11 

    Explanation
    Hz = 0

    Which TM mode in rectangular waveguide has lowest cutoff frequency? TM11 TM01 TM10 TM21 Hz = 0 Ex =

    Which TM mode in rectangular waveguide has lowest cutoff frequency? TM11 TM01 TM10 TM21 Hz = 0 Ex =

    Which TM mode in rectangular waveguide has lowest cutoff frequency? TM11 TM01 TM10 TM21 Hz = 0 Ex =

    Ex = ± ZTM Hy

    Ey = ± ZTM Hx

    where E0 is the amplitude of the wave.

    The expressions for ?, ?c, fc, ?g, a are the same as for TE waves.

    For TM wave the lowest cut off frequency in rectangular wave guide is for TM11 mode.

    If Which TM mode in rectangular waveguide has lowest cutoff frequency? TM11 TM01 TM10 TM21 Hz = 0 Ex = , the cutoff frequency for TM11 mode is about 12% more than that for TE20 mode.

    More questions

    • 1. As compared to dimensions of most feeds, the skin depth at microwave frequencies is

    • Options
    • A. of the same magnitude
    • B. much larger
    • C. much smaller
    • D. either (b) or (c)
      • Discuss
    • 2. For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about

    • Options
    • A. 1000 MHz
    • B. 5000 MHz
    • C. 14000 MHz
    • D. 140000 MHz
      • Discuss
    • 3. In a radio receiver

    • Options
    • A. all stages contribute equally to noise
    • B. RF stage has no effect on S/N ratio
    • C. mixer stage contributes most of the noise generated
      • Discuss
    • 4. As compared to an ordinary semiconductor diode, a Schottky diode

    • Options
    • A. has higher reverse saturation current
    • B. has higher reverse saturation current and higher cut in voltage
    • C. has higher reverse saturation current and lower cut in voltage
    • D. has lower reverse saturation current and lower cut in voltage
      • Discuss
    • 5. A 3 port circulator is in the given figure. Its scattering matrix is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. The total field developed by an antenna array at a distant point is

    • Options
    • A. phasor sum of fields produced by individual antennas of the array
    • B. algebraic sum of fields produced by individual antennas of the array
    • C. either (a) or (b) depending on type of array
    • D. neither (a) nor (b)
      • Discuss
    • 7. A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is

    • Options
    • A. 1.39 V
    • B. 0.75 V
    • C. 13.9 V
    • D. 7.45 V
      • Discuss
    • 8. The number of valence electrons in donor impurity are

    • Options
    • A. 5
    • B. 4
    • C. 3
    • D. 1
      • Discuss
    • 9. Assertion (A): A DIAC has four layers but only two terminals.

      Reason (R): A DIAC can conduct in both directions.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R 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
      • Discuss
    • 10. A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 3 or 4
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.