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  • Question

  • A system has its two poles on the negative real axis and one pair of poles lies on j? axis. The system is


  • Options
  • A. stable
  • B. unstable
  • C. limitedly stable
  • D. either (a) or (c)

  • Correct Answer
  • limitedly stable 

    Explanation
    Poles on j x-axis lead to oscillations.

    More questions

    • 1. In an n channel JFET, the gate is

    • Options
    • A. n type
    • B. p type
    • C. either n or p
    • D. partially n & partially p
      • Discuss
    • 2. If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 3. The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be

    • Options
    • A. 32 mH
    • B. 16 mH
    • C. 8 mH
    • D. 4 mH
      • Discuss
    • 4. If the diameter of a wire is doubled, its current carrying capacity becomes

    • Options
    • A. one-fourth
    • B. half
    • C. twice
    • D. four times
      • Discuss
    • 5. A 3 phase balanced supply feeds 3 phase unbalanced load. Power supplied to the load can be measured by using

      1. 2 wattmeter
      2. one wattmeter
      3. 3 wattmeter
      Which of the above statements is correct?

    • Options
    • A. 1 and 2
    • B. 1 and 3
    • C. 2 and 3
    • D. 3 alone
      • Discuss
    • 6. An infinite ladder is constructed with 1 ? and 2 ? resistors shown below.

    • Options
    • A. 8.18 A
    • B. 0 A
    • C. 9 A
    • D. can't determined
      • Discuss
    • 7. In a three phase series inverter, the firing frequency is

    • Options
    • A. three times output frequency
    • B. six times output frequency
    • C. twice the output frequency
    • D. equal to output frequency
      • Discuss
    • 8. Two thyristors of the same rating and specifications

    • Options
    • A. will have equal on state voltage drops
    • B. will have equal forward blocking voltage for the same current
    • C. will have different on state voltage drops
    • D. may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
      • Discuss
    • 9. The terms RMS and average values apply only to sine waves.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. A moving coil instrument has a resistance of 0.6 ? and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be

    • Options
    • A. 0.6 ?
    • B. 0.06 ?
    • C. 0.1 ?
    • D. 0.004 ?
      • Discuss

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