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ECE :: Exam Questions Paper

  1. Which of the following equations satisfy Maxwell's equations?

  2. A.
    Ex = Ey = 0, Ez = cos (y - ct)
    Bx = cos(y - ct), By = Bz = 0
    B.
    Ex = Ey = 0, Ez = cos (y- ct)
    By = cos(y - ct), Bx = Bz = 0
    C.
    Fy = cos (y - ct), Ex = Ez = 0
    Bx = cos(y - ct), By = Bz = 0
    D.
    None of these

  3. Conversion rate, for a successive approximation ADC which uses 2 MHz clock and 5 bit binary ladder containing 8 VV reference voltage is __________ .

  4. A.
    64516.12 conversions/sec
    B.
    400000 conversions/sec
    C.
    400000 bps
    D.
    2.5 bps

  5. V(t) across R2 for t > 0 is given by,

  6. A.
    2 - 2e-2t
    B.
    2 - e-2t
    C.
    2 - e-t
    D.
    1 - e-t

  7. The rms value of the periodic waveform e(t) shown in fig. is

  8. A.
    B.
    C.
    D.
    3A

  9. A parallel plate capacitor has surface density of rs C/m2. The dielectric inside capacitor is air. The electric field intensities outside and inside the capacitor are


  10. A plane wave having the electric field component V/m and travelling in free space in incident normally on a lossless medium with m = m0 and e = 9e0 which occupies the region y ≥ 0. The reflected magnetic field component is given by


  11. For the circuit shown in the following figure, transistors M1 and M2 are identical NMOS transistors. Assume that M2 is in saturation and the output is unloaded

    The current Ix is related to Ibias as

  12. A.
    Ix = Ibias + Is
    B.
    Ix = Ibias
    C.
    Ix = Ibias - Is
    D.

  13. I1(s) and I2(s) are the Laplace transforms of i1(t) and i2(t) respectively. The equations for the circuit shown in above figure when switch S is closed at t = 0; are


  14. The residues of a complex function at its poles are


  15. A signal with ± 10 V ranged and 1 KHz band width is being digitized using a sample and hold circuit and a 10 bit quantizer. The quantization step is :

  16. A.
    1 x 10-9 V
    B.
    5 x 10-9 V
    C.
    2.5 x 10-9 V
    D.
    0.5 x 10-9 V