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  • Question

  • 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

  • Correct Answer
  • are similar 

    • Power Electronics problems

    Search Results

    • 1. The symbol in figure is for

    • Options
    • A. UJT
    • B. PUT
    • C. SCS
    • D. SBS
      • Discuss
    • 2. 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
    • 3. A 3 phase series inverter has

    • Options
    • A. 12 thyristors
    • B. 6 thyristors
    • C. 3 thyristors
    • D. 3 or 6 thyristors
      • Discuss
    • 4. 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
    • 5. 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
    • 6. HVDC systems are preferable for only long distances.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A single phase half bridge inverter required to feed R-L loads needs

    • Options
    • A. 2 thyristors
    • B. 4 thyristors
    • C. 2 thyristors and two diodes
    • D. 4 thyristors and 4 diodes
      • Discuss
    • 8. When a dc chopper feeds an RLE load, the load current, during steady state operation

    • Options
    • A. remains constant
    • B. varies between maximum and minimum values
    • C. may remain constant or vary
    • D. is constant if R is constant
      • Discuss
    • 9. In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors

    • Options
    • A. must be isolated
    • B. may or may not be isolated
    • C. should be preferably, isolated
    • D. should not be isolated
      • Discuss
    • 10. Which of the following devices has metal-silicon junction?

    • Options
    • A. General purpose power diode
    • B. Schottky diode
    • C. SCR
    • D. MOSFET
      • Discuss

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