logo

CuriousTab

CuriousTab

Discussion

Home ‣ Electronics and Communication Engineering ‣ Power Electronics Comments
  • Question

  • Which of these devices can conduct in both directions?


  • Options
  • A. SCR
  • B. SUS
  • C. SBS
  • D. UJT

  • Correct Answer
  • SBS 

    • Power Electronics problems

    Search Results

    • 1. The efficiency of a chopper circuit is about

    • Options
    • A. 80% or more
    • B. around 50%
    • C. around 20%
    • D. around 5%
      • Discuss
    • 2. A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47°. If connections of battery are reversed, the firing angle is likely to be

    • Options
    • A. 47°
    • B. less than 47°
    • C. more than 47°
    • D. either more or less than 47°
      • Discuss
    • 3. Assertion (A): A half wave controlled rectifier has poorer efficiency and higher ripple factor than a full wave controlled rectifier.

      Reason (R): The use of a freewheeling diode in half wave controlled rectifier circuit improves the waveform of load current and circuit power factor.


    • 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
    • 4. The main utility of SCR is due to

    • Options
    • A. gate triggering
    • B. high temperature triggering
    • C. triggering
    • D. high breakdown voltage
      • Discuss
    • 5. Which of the following devices has metal-silicon junction?

    • Options
    • A. General purpose power diode
    • B. Schottky diode
    • C. SCR
    • D. MOSFET
      • Discuss
    • 6. Mc Murray full bridge inverter uses

    • Options
    • A. 4 thyristors and 2 diodes
    • B. 4 thyristors and 4 diodes
    • C. 8 thyristors and 4 diodes
    • D. 8 thyristors and 8 diodes
      • Discuss
    • 7. If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. In rectifier circuits, the rms value of ac component of output voltage is equal to

    • Options
    • A. Vrms
    • B. 0.5 Vrms
    • C. (Vrms - Vdc)0.5
    • D. (Vrms2 - Vdc2)0.5
      • Discuss
    • 9. Half bridge and full bridge inverters of one type use different commutation methods.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is

    • Options
    • A. 36
    • B. 18
    • C. 12
    • D. 8
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.