Home / ECE / Network Analysis and Synthesis :: Section 18

ECE :: Network Analysis and Synthesis

  1. For an ac circuit having capacitance C, instantaneous current i and instantaneous voltage e are related as

  2. A.
    True
    B.
    False

  3. The relative permeability of an iron specimen is 400 when B = 0.2 T. If B = 0.4 T, μr will be

  4. A.
    400
    B.
    less than 400
    C.
    more than 400
    D.
    more or less than 400

  5. When a circuit is excited by ac sinusoidal source, the admittance is obtained by letting s = jω in Y(s).

  6. A.
    True
    B.
    False

  7. In figure the total inductance of the circuit is

  8. A.
    L1 + L2
    B.
    L1 + L2 - M
    C.
    L1 + L2 - 2M
    D.
    L1 + L2 + M

  9. I = dq/dt.

  10. A.
    True
    B.
    False

  11. A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 Ω, the remaining circuit being the same, the current in this branch will be

  12. A.
    2.2 A
    B.
    less than 2.2 A
    C.
    2.2 A or less than 2.2 A
    D.
    2.2 A or less or more than 2.2 A

  13. A constant k high pass filter has fc = 3000 Hz. At f = 1000 Hz, the phase shift is

  14. A.
    zero
    B.
    p
    C.
    2 p
    D.
    more than p

  15. For an RC impedance function Z

  16. A.
    Z(∞) = Z(0)
    B.
    Z(∞) < Z(0)
    C.
    Z(∞) ≤ Z(0)
    D.
    Z(∞) > Z(0)

  17. In figure, the effective capacitance between A and B is

  18. A.
    2 μF
    B.
    4 μF
    C.
    8 μF
    D.
    10 μF

  19. If Va1, Va2, Va0 are the symmetrical components of Va, then

  20. A.
    Va = Va1 + Va2 + Va0
    B.
    Va = a2Va1 + aVa2 + Va0
    C.
    Va = aVa1 + a2Va2 + Va0
    D.
    Va = aVa0 + a2Va1 + Va2