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ECE :: Network Analysis and Synthesis

  1. A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is

  2. A.
    10 sin (200t + 90°)
    B.
    10 sin (200t - 90°)
    C.
    10 sin(1000t + 90°)
    D.
    10 sin (1000t - 90°)

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  3. In figure, capacitor is used to develop pulses of short duration and large duty cycle across R2 when switch is closed. Which of the following combinations is best suited?

  4. A.
    R1 and R2 large but C small
    B.
    R1 and R2 small but C large
    C.
    R1 and C large and R2 small
    D.
    R2 and C large but R1 small

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  5. In figure, which value of ZL will cause maximum power to be transferred to the load?

  6. A.
    2 + j2 Ω
    B.
    2 - j2 Ω
    C.
    - 2 Ω
    D.
    2 Ω

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  7. A wave trap is a

  8. A.
    series tuned circuit
    B.
    a parallel tuned circuit
    C.
    either a series tuned circuit or parallel tuned circuit
    D.
    none of the above

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  9. In following circuit, steady state is reached with S open, S is closed at t = 0, the current I at t = 0+ is given by

  10. A.
    9 Ω
    B.
    6 Ω
    C.
    7 Ω
    D.
    10 Ω

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  11. In an ac series RLC circuit the maximum phase difference between any two voltages can be

  12. A.
    90°
    B.
    45°
    C.
    - 90°
    D.
    180°

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  13. In a series circuit with XL constant and R variable the current locus lies in the third quadrant.

  14. A.
    True
    B.
    False

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  15. One coulomb charge is equal to the charge on

  16. A.
    6.24 x 1018 electrons
    B.
    6.24 x 1024 electrons
    C.
    6.24 x 1018 atoms
    D.
    none of the above

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  17. For the two port of figure, z22 is

  18. A.
    26/7 Ω
    B.
    6/7 Ω
    C.
    2/3 Ω
    D.
    1 Ω

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  19. The internal impedance of a source is 3 + j 4 Ω. It is desired to supply maximum power to a resistive load. The load resistance should be

  20. A.
    3 Ω
    B.
    4 Ω
    C.
    7 Ω
    D.
    5 Ω

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