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  • Question

  • If the system T.F. is If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 + The differential equation representing the system is


  • Options
  • A. If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 +
  • B. If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 +
  • C. If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 +
  • D. none of these

  • Correct Answer
  •  

    Explanation
    If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 +

    (s3 + 2s2 + 5s + 6)y(s) = (s2 + 4) x (s)

    s3y(s) + 2s2y(s) + 5sy(s) + 6y(s) = s2 x (s) + 4 x (s)

    Replacing s by If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 + and y(s) by y(t) and x(s) by x(t) we get

    If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 +y(t) + 2If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 +y(t) + 5If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 +y(t) + 6y(t)

    = If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 +x(t) + 4x(t)

    If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 + + 2If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 + + 5If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 + + 6 = If the system T.F. is The differential equation representing the system is none of these (s3 + 2s2 + + 4x

    This is required differential equation.

    Exam Questions Papers problems

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    • 1. A TV picture is to be transmitted over a channel of 6 MHz bandwidth at a 35 dB S/N ratio. The capacity of the channel is

    • Options
    • A. 50 Mbps
    • B. 100 Mbps
    • C. 36 Mbps
    • D. 72 Mbps
      • Discuss
    • 2. The amplitude of a pair of composite sinusoidal signal y(n) = x1(n) + x2(n) with x1(n) = sin (5pn) x2(n) = 3 sin (5pn) is __________ .

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 1
      • Discuss
    • 3. The ratio of the diffusion coefficient in a semiconductor has the units

    • Options
    • A. V-1
    • B. em.V-1
    • C. V.cm-1
    • D. V.s
      • Discuss
    • 4. In the circuit below, delay of the EXOR and AND


      Logic gates are 20 ?s and 10 ?s respectively, then the wave y' and y (with initial condition y = 1) will be :

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. As the temperature increases the mobility of electrons __________ .

    • Options
    • A. decreases because the number of carries increases with increased collisions
    • B. increases because the number of carries decreases with decreased collisions
    • C. remains same
    • D. none of the above
      • Discuss
    • 6. What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%?

    • Options
    • A. 2 kV, 0.5 kV
    • B. 1 kV, 0.5 kV
    • C. 0.75 kV, 0.25 kV
    • D. 0.5 kV, 1.5 kV
      • Discuss
    • 7. A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW then pinch-off voltage is __________ .

    • Options
    • A. - 2 V
    • B. 2 V
    • C. - 4 V
    • D. 4 V
      • Discuss
    • 8. Suppose that the modulating signal is m(t) = 2cos (2pfmt) and the carrier signal is xC(t) = AC cos(2pfct), which one of the following is a conventional AM signal without over modulation?

    • Options
    • A. x(t) = Acm(t)cos(2pfct)
    • B. x(t) = Ac [1 + m(t)]cos (2pfct)
    • C.
    • D. x(t) = Accos(2pfmt)cos(2pfct) + Acsin(2pfmt)sin(2pfct)
      • Discuss
    • 9. A MOSFET has a threshold voltage of 1 V and oxide thickness of 500 x 10-8 [?r = 3.9; ?0 = 8.85 x 10-14 F/cm, q = 1.6 x 10-19 c]. The region under the gate is ion implanted for threshold voltage tailoring. The base and type of impant required to shift threshold voltage to - 1 V are __________ .

    • Options
    • A. 8.6 x 1011/cm2, p-type
    • B. 8.6 x 1011/cm2, n-type
    • C. 0.86 x 109/cm2, p-type
    • D. 1.02 x 1012/cm2, n-type
      • Discuss
    • 10. 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

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