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ECE :: Network Analysis and Synthesis

  1. The average value of delayed full wave rectified sine wave (figure) is


  2. A current increasing at the rate of 1 A/s is passed through 1 F capacitor. At t = 0, i = 0. The charge stored after 1 second is

  3. A.
    0.5 C
    B.
    1 C
    C.
    2 C
    D.
    4 C

  4. An RLC series circuit has R = 30 Ω, XL = 30 Ω and XC = 30 W. Its impedance is

  5. A.
    30 ∠0°.
    B.
    30 ∠45°
    C.
    42.42 ∠45°
    D.
    90 ∠45°.

  6. R, L and C are in parallel. The circuit is switched on to a constant current source I at t = 0. At t = ∞ the current through inductance is I.

  7. A.
    True
    B.
    False

  8. A 2 mH inductor with some initial current can be represented as shown below, where s is the Laplace transform variable. The value of initial current is

  9. A.
    0.5 A
    B.
    1.0 A
    C.
    2.0 A
    D.
    0.0 A

  10. As temperature increases, the temperature coefficient of metals increases.

  11. A.
    True
    B.
    False

  12. In a 3 phase system, the zero sequence component of line to line voltages is zero

  13. A.
    if line to line voltages are balanced
    B.
    if line to line voltages are unbalanced
    C.
    if line to line voltages are balanced or unbalanced
    D.
    if degree of unbalanced in line to line voltages is small

  14. Magnetic effect of current is used in generators but not in motors.

  15. A.
    True
    B.
    False

  16. For a nonlinear resistance

  17. A.
    v-i plot is not a straight line
    B.
    resistance increases as current increases
    C.
    resistance decreases as current increases
    D.
    current decreases as voltage increases

  18. The Z parameters Z11 and Z21 for the 2-port network in the figure.

  19. A.
    Z11 = - 6/11Ω; Z21 = 16/11Ω
    B.
    Z11 = 6/11Ω; Z21 = 4/11Ω
    C.
    Z11 = 6/11Ω; Z21 = - 16/11Ω
    D.
    Z11 = 4/11Ω; Z21 = 4/11Ω