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ECE :: Network Analysis and Synthesis

  1. A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10 nF capacitor in the second branch. At resonance frequency is

  2. A.
    100 rad/sec
    B.
    10000 rad/sec
    C.
    1000 rad/sec
    D.
    more than 10000 rad/sec

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  3. A circuit is replaced by its Thevenin's equivalent to find current through a certain branch. If VTH = 10 V and RTH = 20 Ω, the current through the branch

  4. A.
    will always be 0.5 A
    B.
    will always be less than 0.5 A
    C.
    will always be equal to or less than 0.5 A
    D.
    may be 0.5 A or more or less

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  5. An ideal transformer has a turn ratio of 2 : 1. Taking hv side as port 1 and lv side as port 2, transmission parameters of transformer are

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  7. The voltage e0 in the figure

  8. A.
    48 V
    B.
    24 V
    C.
    36 V
    D.
    28 V

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  9. A capacitor used for power factor correction is single phase circuit decreases

  10. A.
    power factor
    B.
    line current
    C.
    both line current and p.f.
    D.
    the line current and increases p.f.

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  11. Assertion (A): In an R-L circuit having high inductance, the rise of current is very slow.

    Reason (R): The time constant of R-L circuit is L/R.

  12. A.
    Both A and R are true and R is correct explanation of A
    B.
    Both A and R are true and R is not the correct explanation of A
    C.
    A is true but R is false
    D.
    A is false but R is true

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  13. The distance between the plates of a parallel plate capacitor is d. The dielectric is in two parts, each of equal thickness but dielectric constants ∈1 and ∈2 respectively. The total capacitance will be proportional to

  14. A.
    B.
    1 - ∈2
    C.
    D.
    12

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  15. An air cored coil has an inductance of 0.3 H. If another coil has an iron core of μr = 500, the remaining quantities being the same, the inductance of the second coil will be

  16. A.
    0.3 H
    B.
    0.3 x 500 H
    C.
    D.
    none of the above

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  17. A two branch tuned circuit has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. If R is increased, the dynamic resistance

  18. A.
    increases
    B.
    decreases
    C.
    remains constant
    D.
    may increases or decreases

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  19. A 1 μF capacitor is connected to 12 V battery. The energy stored in the capacitor is

  20. A.
    12 x 10-6 J
    B.
    24 x 10-6 J
    C.
    48 x 10-6 J
    D.
    72 x 10-6 J

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