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ECE :: Network Analysis and Synthesis

  1. An R-L series circuit has R = 5 Ω and L = .01 H. It is fed by ac 50 Hz supply. The rms current in the circuit is 5 A. The active power supplied by the source is

  2. A.
    25 W
    B.
    50 W
    C.
    125 W
    D.
    250 W

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  3. A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A. The average of resultant current is

  4. A.
    zero
    B.
    24.14A
    C.
    10A
    D.
    14.14A

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  5. In figure, the switch is closed at t = 0. After some time i = 6A and rate of change of current was 4A/s. The value of inductor is

  6. A.
    1 H
    B.
    1.5 H
    C.
    indeterminate
    D.
    0.5 H

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  7. Assertion (A): In series R-L-C circuit, the current may lead or lag the voltage depending on the value of R.

    Reason (R): Phase angle of an R-L series circuit is tan-1 (ωL/R).

  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

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  9. In figure the switch has been in position 1 for a long time. At t = 0, the switch is moved to position 2. The equation for transient current is

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  11. An RL impedance function can also be realized as

  12. A.
    RC impedance function
    B.
    RC admittance function
    C.
    LC impedance function
    D.
    LC admittance function

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  13. A step voltages is applied to RLC series circuit having R = 2 Ω, L = 1 H and C = 1 F. The transient current response will be

  14. A.
    over damped
    B.
    critically damped
    C.
    under damped
    D.
    any of the above depending the magnitude of voltage

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  15. Class C solid insulators should not be used above 100°C.

  16. A.
    True
    B.
    False

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  17. Assertion (A): Superposition theorem can be used to find the output of a full wave rectifier excited by sinusoidal signal sources of different frequencies connected in series.

    Reason (R): Superposition theorem is valid for all linear systems.

  18. 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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  19. Insulation resistance of a cable is directly proportional to its length.

  20. A.
    True
    B.
    False

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