logo

CuriousTab

CuriousTab

Power Electronics problems

  • 1. In a single phase full wave ac regulator the firing angles during both half cycles are equal.

  • Options
  • A. True
  • B. False
    • Discuss
  • 2. A string of series connected thyristors needs equalising circuit to

  • Options
  • A. ensure proper firing
  • B. ensure proper current division
  • C. ensure proper voltage division
  • D. none of the above
    • Discuss
  • 3. Multiphase choppers are used in

  • Options
  • A. low power circuits
  • B. high power circuit
  • C. both low and high power circuits
  • D. medium power circuits
    • Discuss
  • 4. In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is

  • Options
  • A. 150 A
  • B. 75 A
  • C. 50 A
  • D. 300 A
    • Discuss
  • 5. A half bridge inverter

  • Options
  • A. needs a 3 wire dc supply
  • B. may use a two wire or 3 wire dc supply
  • C. has higher output voltage if fed from 3 wire dc supply
  • D. has higher efficiency if fed from 3 wire dc supply
    • Discuss
  • 6. A 3 phase series inverter has

  • Options
  • A. 12 thyristors
  • B. 6 thyristors
  • C. 3 thyristors
  • D. 3 or 6 thyristors
    • Discuss
  • 7. In a single phase converter using a centre tapped transformer and with a highly inductive load, the firing angles is a. Each thyristor conducts for a period

  • Options
  • A. p
  • B. a
  • C. p - a
  • D.
    • Discuss
  • 8. The symbol in figure is for
    Electronics and Communication Engineering Power Electronics: The symbol in figure is for

  • Options
  • A. UJT
  • B. PUT
  • C. SCS
  • D. SBS
    • Discuss
  • 9. In a single phase half wave converter feeding resistive load and full wave converter (M - 2 connection) feeding a resistive load the circuit conditions are similar. The firing angle is a. Then the waveshapes of voltages across thyristors

  • Options
  • A. are similar
  • B. are not similar
  • C. may be similar or dissimilar
  • D. are similar only for some values of a
    • Discuss
  • 10. HVDC systems are preferable for only long distances.

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

First 24 25 26 ... 33 .. 40 41 Last

Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.