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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. The maximum signal propagation time of a geosynchronous satellite transmission is about __________ millisecond.

    • Options
    • A. 540
    • B. 270
    • C. 135
    • D. 1080
      • Discuss
    • 2. In carbon resistor colour code, the third band is red. It indicates

    • Options
    • A. two zeros
    • B. three zeros
    • C. multiplier is 0.01
    • D. multiplier is 0.1
      • Discuss
    • 3. Low-orbit satellites are not used for communications because they

    • Options
    • A. produce sonic booms
    • B. do not provide 24 hour/ day contact to the users on Earth
    • C. heat up and melt
    • D. none
      • Discuss
    • 4. When a thyristor is conducting, the voltage drop across it is about

    • Options
    • A. 1 V
    • B. 10 V
    • C. 100 V
    • D. 0.1 V
      • Discuss
    • 5. In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept

    • Options
    • A. equal to velocity of electron
    • B. slightly less than velocity of electron
    • C. slightly more than velocity of electron
    • D. equal to velocity of light in free space
      • Discuss
    • 6. Assertion (A): SUS is a PUT and avalanche diode connected between gate and cathode

      Reason (R): SBS has two SUS inbuilt together and connected in anti-parallel


    • 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
    • 7. In a CRO which of the following is not a part of electron gun

    • Options
    • A. cathode
    • B. grid
    • C. accelerating anode
    • D. X - Y plates
      • Discuss
    • 8. Which of the following can be accessed only sequentially?

    • Options
    • A. Floppy disk
    • B. Hard disk
    • C. Magnetic tape
    • D. ROM
      • Discuss
    • 9. Which of the following is not a valid variable name in C?

    • Options
    • A. p o, t
    • B. p o t
    • C. po_t
    • D. p_ot
      • Discuss
    • 10. A magnet does not attract

    • Options
    • A. nickel
    • B. iron
    • C. copper
    • D. iron and copper
      • Discuss

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