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  • 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. Match the following:

      List I (VCR system) List II (Azimuth angle)
      A. VHS 1. 7°
      B. Video 2000 2. 15°
      C. Betamax 3. 6°


    • Options
    • A. A-1, B-2, C-3
    • B. A-1, B-3, C-2
    • C. A-3, B-1, C-2
    • D. A-3, B-2, C-1
      • Discuss
    • 2. Match the following:

      List I List II
      A. Copper 1. produces discrete energy level just above valence band
      B. Rubber 2. produces discrete energy level just below conduction band
      C. Antimony 3. large forbidden gap
      D. Boron 4. valence and conduction bands overlap


    • Options
    • A. A-1, B-2, C-4, D-3
    • B. A-4, B-1, C-2, D-3
    • C. A-4, B-3, C-1, D-2
    • D. A-2, B-1, C-3, D-4
      • Discuss
    • 3. The number of doped regions in a SCR is

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 4. In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of

    • Options
    • A. 60°
    • B. 90°
    • C. 120°
    • D. 180°
      • Discuss
    • 5. A loss less line of characteristic impedance Z0 is terminated in pure reactance of -jZ0 value. VSWR is

    • Options
    • A. 10
    • B. 2
    • C. 1
    • D. infinity
      • Discuss
    • 6. A typical error rate on satellite circuits is one bit error in

    • Options
    • A. 107
    • B. 103
    • C. 102
    • D. 1010
      • Discuss
    • 7. In elemental dielectrics, the orientation and ionic polarization are absent.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

    • Options
    • A. Variable selectivity
    • B. Variable sensitivity
    • C. Double conversion
    • D. Squelch
      • Discuss
    • 9. The waveshape of output voltage of half bridge inverter is

    • Options
    • A. sinusoidal
    • B. square
    • C. triangular
    • D. either (a) or (b)
      • Discuss
    • 10. The main utility of SCR is due to

    • Options
    • A. gate triggering
    • B. high temperature triggering
    • C. triggering
    • D. high breakdown voltage
      • Discuss

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