logo

CuriousTab

CuriousTab

Discussion

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

  • A single phase semiconverter is supplying RLE load and has a freewheeling diode across the load. The firing angle is a. The freewheeling diode conducts for


  • Options
  • A. a° in each half cycle
  • B. (p - a)° in each cycle
  • C. a° in one full cycle
  • D. (p + a)° in each half cycle

  • Correct Answer
  • a° in each half cycle 

    • Power Electronics problems

    Search Results

    • 1. Assertion (A): McMurray Bredford half bridge inverter uses complementary commutation

      Reason (R): Three phase inverter can have two modes of operation.


    • 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
    • 2. In a single phase full wave regulator feeding R-L load, short gate pulse are not suitable.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. In a full bridge inverter fed by a battery of voltage V, the rms value of fundamental component of output voltage is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. A single phase full bridge inverter for R-L loads needs

    • Options
    • A. 4 thyristors
    • B. 4 thyristors and 4 diodes
    • C. 4 thyristors and 2 diodes
    • D. 8 thyristors
      • Discuss
    • 5. In a cycloconverter it is possible to vary

    • Options
    • A. only output frequency
    • B. only output voltage
    • C. both output voltage and frequency but not simultaneously
    • D. both output voltage and output frequency simultaneously
      • Discuss
    • 6. Which chopper circuit uses saturable reactor?

    • Options
    • A. Auxiliary commutated
    • B. Jones chopper
    • C. Morgan chopper
    • D. Load commutated
      • Discuss
    • 7. For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. In a series inverter

    • Options
    • A. the commutating elements carry full load current
    • B. the commutating elements carry upto 50% of load current
    • C. the commutating elements do not carry load current
    • D. any of the above
      • Discuss
    • 9. When a UJT is used as a relaxation oscillator the current should be

    • Options
    • A. less than Ip
    • B. more than Iv
    • C. more than Ip but less than Iv
    • D. negative
      • Discuss
    • 10. Two single phase semi-converters are connected in series to form a series converter. The input is v = Vm sin ?t and a1, a2 are the firing angles. If a1 = 0, the dc output voltage is

    • Options
    • A. (1 + cos a2)
    • B. (2 + cos a2)
    • C. (3 + cos a2)
    • D. (4 + cos a2)
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.