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ECE :: Network Analysis and Synthesis

  1. A coil is wound having a diameter d. Its inductance is 10 mH. If it is rewound on the same core with a wire having diameter 0.5 d and total weight of the wire is the same as before, the inductance will be

  2. A.
    5 mH
    B.
    10 mH
    C.
    160 mH
    D.
    40 mH

  3. Permeability is analogous to

  4. A.
    conductivity
    B.
    resistivity
    C.
    retentivity
    D.
    coercivity

  5. A resistance and an inductance are connected in parallel and fed from 50 Hz ac mains. Each branch takes a current of 5 A. The current supplied by source is

  6. A.
    10 A
    B.
    7.07 A
    C.
    5 A
    D.
    zero

  7. Assertion (A): The inductance of an iron cored solenoid is not constant.

    Reason (R): BH curve of an iron specimen is non-linear.

  8. 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

  9. An RC driving point impedance function has zeros at s = - 2 and s = - 5. The admissible poles are

  10. A.
    s = 0 and s = -6
    B.
    s = -1 and s = -3
    C.
    s = 0 and s = -1
    D.
    s = -3 and s = -4

  11. A triangular Pulse of 10 V peak is applied to a capacitor of 0.4 F. The change of the capacitor and its waveform is

  12. A.
    8 rectangular
    B.
    8 triangular
    C.
    4 triangular
    D.
    4 rectangular

  13. A 10 μF capacitor is charged from a 5 volt source through a resistance of 10 kΩ. The charging current offer 35 m sec. If the initial voltage on C is - 3 V is

  14. A.
    0.56 mA
    B.
    5.6 mA
    C.
    6 mA
    D.
    5 μA

  15. If an admittance Y(s) has a term Ks, the realization would give

  16. A.
    an inductance of value K
    B.
    a resistance of value K
    C.
    a capacitance of value K
    D.
    either (a) or(c)

  17. If the diameter of a wire is doubled, the current carrying capacity of the wire becomes

  18. A.
    half
    B.
    twice
    C.
    four times
    D.
    one-fourth

  19. Assertion (A): The function is not positive real.

    Reason (R): The degrees of numerator and denominator differ by 2

  20. 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