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  • Question

  • The characteristics of a non-linear resistance is i = kv4. If i becomes 100 times, v becomes


  • Options
  • A. about 100 times
  • B. about 10 times
  • C. about 3 times
  • D. about twice

  • Correct Answer
  • about 3 times 

    Explanation
    v ? (i)1/4 ? (100)1/4 ? 3.

    Power Electronics problems

    Search Results

    • 1. A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is

    • Options
    • A. 20 W
    • B. 50 W
    • C. 92 W
    • D. 128 W
      • Discuss
    • 2. Assertion (A): An ideal rectifier should have unity harmonic factor

      Reason (R): An ideal rectifier should have unity displacement 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
    • 3. In a thyristor the gate current is increased, then

    • Options
    • A. anode current will increase
    • B. anode current will decrease
    • C. anode current will remain constant
    • D. anode current may increase or decrease
      • Discuss
    • 4. Assertion (A): If the duty cycle of chopper is low the current would not become discontinuous

      Reason (R): If the time constant L/R of the load in chopper is low the current may become discontinuous.


    • 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
    • 5. A chopper

    • Options
    • A. converts constant voltage dc into ac and then into variable voltage dc
    • B. converts constant voltage dc into variable voltage dc directly
    • C. converts ac of one frequency into ac of another frequency
    • D. converts ac to dc
      • Discuss
    • 6. The number of leads in an SCR are :

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 7. Thyristors are not suitable for logic circuits.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A cycloconverter can be

    • Options
    • A. step down
    • B. step up
    • C. step down or step up
    • D. none of the above
      • Discuss
    • 9. For a 12 pulse operation, the two 6 pulse units are fed by

    • Options
    • A. Y - Y and Y - Y transformers
    • B. ? - ? and ? - ? transformers
    • C. Y - Y and Y - ? transformers
    • D. Y - ? and Y - ? transformers
      • Discuss
    • 10. In a step down chopper using pulse width modulation, Ton = 3 x 10-3 and Toff = 1 x 10-3 s. The chopping frequency is

    • Options
    • A. 333.33
    • B. 250
    • C. 500
    • D. 1000
      • Discuss

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