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  • Question

  • 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

  • Correct Answer
  • 4 mH 

    Explanation
    Inductance is inversely proportional to the core length.

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    • Options
    • A. True
    • B. False
      • Discuss
    • 2. In Gunn diode electrons are transferred from

    • Options
    • A. Ridge guide is essentially a form of capacitively loaded guide
    • B. low to high mobility energy bands
    • C. valley to domain formation
    • D. domain to valley formation
      • Discuss
    • 3. The noise generated by a resistor depends upon

    • Options
    • A. its resistance value
    • B. its operating temperature
    • C. both its resistance value and operating temperature
    • D. none of the above
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      List I List II
      A. AM-DSB FC 1. 2
      B. WBFM 2. 1
      C. PCM 3. 3m
      D. AM-DSB 4. 22N


    • Options
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    • B. A-2, B-1, C-4, D-3
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    • 5. The log magnitude curve for a constant gain K is a

    • Options
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    • Options
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    • 7. Consider the following statements about radar Beacon

      1. It is also called transponder.
      2. It includes pulse transmitter, receiver and antenna.
      3. It replies with full power even when the signal receives is weak.
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    • Options
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    • C. 2 and 3 only
    • D. 2 only
      • Discuss
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    • Options
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    • A. TE wave
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    • C. both TE and TM waves
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      • Discuss
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    • Options
    • A. increases with increase in light intensity
    • B. decreases with increase in light intensity
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    • D. remains constant
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