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  • Question

  • A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load


  • Options
  • A. rectification efficiency will be more than 0.6 and TUF will be more than 0.35
  • B. rectification efficiency will be more than 0.6 but TUF will be less than 0.35
  • C. rectification efficiency will be less than 0.6 and TUF will be less than 0.35
  • D. rectification efficiency will be less than 0.6 but TUF will be more than 0.35

  • Correct Answer
  • rectification efficiency will be more than 0.6 and TUF will be more than 0.35 

    • More questions

    • 1. The expression HZ = C cos(Bx) cos(Ay)yz is for

    • Options
    • A. TE wave
    • B. TM waves
    • C. both TE and TM waves
    • D. some TE and some TM waves
      • Discuss
    • 2. The resistance of a photoconductor

    • Options
    • A. increases with increase in light intensity
    • B. decreases with increase in light intensity
    • C. may increase or decrease with increase in light intensity
    • D. remains constant
      • Discuss
    • 3. In the given figure the time taken by the wave to make one round trip is

    • Options
    • A. 10 ns
    • B. 20 ns
    • C. 30 ns
    • D. 40 ns
      • Discuss
    • 4. In figure, VEB = 0.6 V, ? = 99. Then VC and IC are

    • Options
    • A. 9.3 V and 1.98 mA respectively
    • B. 4.6 V and 1.98 mA respectively
    • C. 9.3 V and 0.02 mA respectively
    • D. 4.6 V and 0.02 mA respectively
      • Discuss
    • 5. A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. Which of the following frequency is least likely to be present in the output?

    • Options
    • A. 1002 kHz
    • B. 1000 kHz
    • C. 999.2 kHz
    • D. 998.0 kHz
      • Discuss
    • 6. A chopper is a high efficiency circuit.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Most of the communication satellites are stationed to the West of their service areas in order to reduce their

    • Options
    • A. eclipse period
    • B. loss of power
    • C. battery power provision
    • D. mass of station-keeping fuel
      • Discuss
    • 8. In a klystron amplifier the transit time of electron passing the gap in the cavity should be

    • Options
    • A. less than one cycle
    • B. less than half cycle
    • C. less than quarter cycle
    • D. more than quarter cycle
      • Discuss
    • 9. The domain mode in rectangular waveguide is

    • Options
    • A. TE01
    • B. TE02
    • C. TE10
    • D. TM11
      • Discuss
    • 10. A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.

    • Options
    • A. True
    • B. False
      • Discuss

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