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  • Question

  • For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • Power Electronics problems

    Search Results

    • 1. Which chopper circuit uses saturable reactor?

    • Options
    • A. Auxiliary commutated
    • B. Jones chopper
    • C. Morgan chopper
    • D. Load commutated
      • Discuss
    • 2. 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
      • Discuss
    • 3. 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
    • 4. In a single phase full wave regulator feeding R-L load, short gate pulse are not suitable.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. If we connect two silicon unilateral switches in anti- parallel we get

    • Options
    • A. SCR
    • B. SBS
    • C. SCS
    • D. UJT
      • Discuss
    • 10. When UJT is used for thyristor gate signal, the output of UJT is

    • Options
    • A. sine wave
    • B. square wave
    • C. saw tooth wave
    • D. either (a) or (c)
      • Discuss

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