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  • Question

  • The number of turns in a coil is doubled. If initial time constant is T, the new time constant is


  • Options
  • A. T
  • B. 2T
  • C. 4T
  • D. The number of turns in a coil is doubled. If initial time constant is T, the new time constant is T

  • Correct Answer
  • 2T 

    Explanation
    When N is doubled, resistance becomes twice and inductance becomes four times.

    Since time constant is The number of turns in a coil is doubled. If initial time constant is T, the new time constant is T , time contant become twice.

    More questions

    • 1. The continuous time system with impulse response h(t) = is stable, for n is even, when

    • Options
    • A. a = 0
    • B. a > 0
    • C. a < 0
    • D. a ? 0
      • Discuss
    • 2. The function f(x - vot) represent which of the following?

    • Options
    • A. A stationary wave
    • B. A wave motion in forward direction
    • C. A wave motion in reverse direction
    • D. None of the above
      • Discuss
    • 3. A radar receiver has a noise figure of 10 dB at 300 K having a bandwidth of 2.5 MHz. The minimum power it can receive is

    • Options
    • A. 3.45 x 10-15 W
    • B. 1.38 x 10-15 W
    • C. 7.5 x 10-15 W
    • D. 93.15 x 10-15 W
      • Discuss
    • 4. Which of the following can not be used as a variable name in C?

    • Options
    • A. else
    • B. coal
    • C. ram
    • D. vendy
      • Discuss
    • 5. As frequency increases, the transmission efficiency

    • Options
    • A. decreases
    • B. increases
    • C. is not affected
    • D. either (a) or (c)
      • Discuss
    • 6. A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is

    • Options
    • A. 100
    • B. 99
    • C. 1.01
    • D. 0.99
      • Discuss
    • 7. Match the following:

      List I List II
      A. Bode 1. Asymptotic plots
      B. Evans 2. Polar plots
      C. Nyquist 3. Root locus technique
      4. M and N circles


    • Options
    • A. A-1, B-4, C-2
    • B. A-2, B-3, C-4
    • C. A-3, B-1, C-4
    • D. A-1, B-3, C-2
      • Discuss
    • 8. A forward voltage of 9 V is applied to a diode in series with a 1 k? load resistor. The voltage across load resistor is zero. It indicates that

    • Options
    • A. diode is short circuited
    • B. diode is open circuited
    • C. resistor is open circuited
    • D. diode is either short circuited or open circuited
      • Discuss
    • 9. In a circular waveguide the dominant mode is

    • Options
    • A. TE01
    • B. TE11
    • C. TE20
    • D. TE21
      • Discuss
    • 10. In body centred cubic structure, comers and centre of the cube are occupied by identical atoms.

    • Options
    • A. True
    • B. False
      • Discuss

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