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ECE :: Network Analysis and Synthesis

  1. If a coil has diameter 'd' number of turns 'N' and form factor 'F' then the inductance of coil is proportional to

  2. A.
    N2dF
    B.
    Nd2F
    C.
    D.

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  3. For the port shown, the short circuit network function at port 2 is given by

  4. A.
    s + 1/4
    B.
    s + 4
    C.
    4s + 1
    D.
    s + 16

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  5. A material for permanent magnet should have

  6. A.
    High retentivity
    B.
    High permeability
    C.
    Low hysteresis loss
    D.
    High hysteresis loss

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  7. Which of the following frequencies has the greatest period?

  8. A.
    20 Hz
    B.
    200 Hz
    C.
    20 kHz
    D.
    200 kHz

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  9. A variable resistance R and capacitive reactance XC are fed by an voltage. The current locus is

  10. A.
    a semi circle in 4th quadrant
    B.
    a semi circle in first quadrant
    C.
    a straight line in 4th quadrant
    D.
    a straight line first quadrant

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  11. Two wires A and B have the same cross-section area and are made of the same material. RA = 600 Ω and RB = 100 Ω. The number of times A is longer than B is

  12. A.
    6
    B.
    2
    C.
    4
    D.
    5

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  13. A dc machine has 6 poles all connected in series. Each pole has 9 H inductance and field current is 2 A. Total inductance and total energy stored are

  14. A.
    9 H and 18 J
    B.
    18 H and 36 J
    C.
    54 H and 108 J
    D.
    108 H and 216 J

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  15. In a series RLC circuit the dB level of currents at half power frequencies as compared to current at resonance is

  16. A.
    + 3
    B.
    - 3
    C.
    0.5
    D.
    - 0.5

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  17. A series RL circuit is initially relaxed. A step voltage is applied to the circuit. If t is the time constant of the circuit, the voltage across R and L will be same at time t equal to

  18. A.
    t ln 2
    B.
    C.
    D.

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  19. In figure, the transmission parameters are A = C = 1, B = 2 and D = 3. Then Zin =

  20. A.
    12/13 Ω
    B.
    13/12 Ω
    C.
    3 Ω
    D.
    4 Ω

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