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ECE :: Network Analysis and Synthesis

  1. In an R-L circuit excited by a battery of voltage E, the current and voltage across resistor are 1- e-t and 2(1 - e-t) respectively. If there were an initial current of 2 A in the inductance, the voltage across resistance would have been

  2. A.
    1 - e-t
    B.
    2 - 2e-t
    C.
    2 + 2e-t
    D.
    4 - 4e-t

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  3. Stray capacitance is important at low frequencies.

  4. A.
    True
    B.
    False

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  5. A non-linear element has zero resistance.

  6. A.
    True
    B.
    False

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  7. In a RL circuit, the angle, θ by which the current lags the voltage is

  8. A.
    0 > θ > - 90°
    B.
    90°
    C.
    D.
    0 < θ < 90°

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  9. v-i relation for a capacitor is

  10. A.
    True
    B.
    False

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  11. The time constant of the circuit in figure is

  12. A.
    6 sec
    B.
    10 sec
    C.
    D.
    16 sec

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  13. The damping coefficient for the given circuit is __________

  14. A.
    1/2
    B.
    1/4
    C.
    2
    D.
    1

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  15. A 60 W, 23 V bulb is used for 45 minutes. The electrical energy consumed in commercial units is

  16. A.
    2700 units
    B.
    0.45 units
    C.
    4.5 units
    D.
    0.045 units

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  17. In an ideal current source, the source resistance is zero.

  18. A.
    True
    B.
    False

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  19. A choke coil has a resistance to reactance ratio of 0.2. The power factor of the choke coil is

  20. A.
    less than 0.2 lagging
    B.
    less than 0.2 leading
    C.
    about 1
    D.
    about 0

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