Home / ECE / Network Analysis and Synthesis :: Section 13

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.

  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

  5. A material for permanent magnet should have

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

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

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

  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

  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

  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

  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

  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.

  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