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  • Question
  • Denominator polynomial of a transfer function of certain network is:
    s3 + s2 + 2s + 24
    Then the network is:


  • Options
  • A. stable
  • B. oscillatory
  • C. unstable
  • D. depends on numerator polynomial

  • Correct Answer
  • unstable 

    Explanation
    Routh array

    Denominator polynomial of a transfer function of certain network is: s3 + s2 + 2s + 24 Then the netw

    There is negative number present in first column. Thus network is unstable.


    Exam Questions Papers problems


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    • 1. During transmission over a communicate channel, bit errors occur independently with probability . If a block of 3 bits are transmitted, the probability of at most one bit error is equal to

    • Options
    • A.
    • B.
    • C.
    • D. none
    • Discuss
    • 2. Consider a stable and causal system with impulse response h(t) and system function H(S). Suppose H(S) is rational, contains a pole at S = - 2, and does not have a zero at the origin. The location of all other poles and zero is unknown for each of the following statements. Let us determine whether statement is true or false.

      1. f[h(t) e-3t] converges
      2. h(t) has finite duration
      3. H(s) = H(- s)
      Choose correct option.

    • Options
    • A. 1 - True, 2 - False, 3 - True, 4 - False
    • B. 1 - False, 2 - False, 3 - False, 4 - True
    • C. 1 - False, 2 - False, 3 - False, 4 - False
    • D. 1 - True, 2 - can't say, 3 - True, 4 - can't say
    • Discuss
    • 3. A transmission line has a characteristic impedance of 50 ? and a resistance of 0.1 ?/m, if the line is distortion less, the attenuation constant (in Np/m) is

    • Options
    • A. 500
    • B. 5
    • C. 0.014
    • D. 0.002
    • Discuss
    • 4. If the power spectral density of stationary random process is a sine-squared function of frequency, the shape of its autocorrelation is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 5. If x1[n] x1(z) with ROC = R1 and x2[n] x2(z) with ROC = R2 then ROC for x1[n] + x2[n] will be __________ (where Ri ? Region of convergence and x1[n] and x2[n] are causal).

    • Options
    • A. R1 ? R2
    • B. R1 ? R2
    • C. (R1 ? R2) ? (R1)
    • D. (R1 ? R2) ? (R1)
    • Discuss
    • 6. In the circuit shown, in switch S is open for a long time and is closed at t = 0. The current i(t) for t ? 0+ is

    • Options
    • A. i(t) = 0.5 - 0.125e-1000t A
    • B. i(t) = 1.5 - 0.125e-1000t A
    • C. i(t) = 0.5 - 0.5e-1000t A
    • D. i(t) = 0.375e-1000t A
    • Discuss
    • 7. Find Vx Vy Vz

    • Options
    • A. Vx = -6 Vy = 3 Vz = -3
    • B. Vx = -6 Vy = -3 Vz = 1
    • C. Vx = 6 Vy = 3 Vz = 3
    • D. Vx = 6 Vy = 1 Vz = 3
    • Discuss
    • 8. The inverse of given Laplace transform is


    • Options
    • A. sin t
    • B. cos t
    • C. et
    • D. e2t
    • Discuss
    • 9. Consider the common emitter amplifier shown below with the following circuit parameters: ? = 100, gm = 0.3861 A/V, r0 = ? rp = 259 ?, Rs = 1 k?, RB = 93 k?, RC = 250 ?, RL = 1 kW, C1 = ? and C2 = 4.7mF.

      The resistance seen by the source Vs is

    • Options
    • A. 258 ?
    • B. 1258 ?
    • C. 93 k?
    • D. ?
    • Discuss
    • 10. A zener diode is used in

    • Options
    • A. voltage regulator circuit
    • B. amplifier circuits
    • C. both voltage regulator and amplifier circuit
    • D. none of the above
    • Discuss


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