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  • Question

  • The two modes of operation of three phase bridge inverters are known as


  • Options
  • A. 60° mode and 120° mode
  • B. 90° mode and 120° mode
  • C. 120° mode and 180° mode
  • D. 120° mode and 240° mode

  • Correct Answer
  • 120° mode and 180° mode 

    Explanation
    In 180° mode each thyristor conducts for 180° and in 120° mode each thyristor conducts for 120°.

    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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