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ECE :: Network Analysis and Synthesis

  1. Two phasors having rms values V1 and V2 which are added to give a phasor having rms value V3. V3 is maximum if phase angle between V1 and V2 is

  2. A.
    90°
    B.
    180°
    C.
    270°
    D.
    360°

  3. A current of 1 A in the coil of an iron cored electromagnet cause a flux density of 0.2.T. If the current is 2 A, B=

  4. A.
    0.2 T
    B.
    0.4 T
    C.
    0.4 T or less
    D.
    0.4 T or more

  5. In figure, the current I4 is

  6. A.
    10 ∠0
    B.
    5 ∠90°
    C.
    5 ∠270°
    D.
    10 ∠90°

  7. For the circuit shown in the figure, the current I is

  8. A.
    indeterminate due to indeterminate data
    B.
    zero
    C.
    4 Amp
    D.
    8 Amp

  9. The current voltage relation for an inductance L is


  10. A band elimination constant k filter has series resonant circuit in series arms.

  11. A.
    True
    B.
    False

  12. If e = 110 sin (ωt + p/3) and i = 5 sin (ωt - p/3), the impedance of the circuit is

  13. A.
    22 Ω
    B.
    16 Ω
    C.
    30.8 Ω
    D.
    11 Ω

  14. Two sinusoidal waves 1 and 2 have peak values Vm1 and Vm2. Wave 1 is leading wave 2 by ∠θ. Which of the following is correct?

  15. A.
    v1 = Vm1 sin θ and v2 = Vm2 cos θ
    B.
    v1 = Vm1 sin ωt and v2 = Vm2 sin (ωt - θ)
    C.
    v1 = Vm1 sin (ωt + θ/2) and v2 = Vm2 sin ωt
    D.
    none of the above

  16. Ohm's law is valid for

  17. A.
    dc voltage and current
    B.
    ac voltage and current
    C.
    all voltages and current
    D.
    dc and ac voltages and currents

  18. In figure, the steady state current through 1H inductance is

  19. A.
    Zero
    B.
    3 A
    C.
    5 A
    D.
    6 A