Home / ECE / Network Analysis and Synthesis :: Section 21

ECE :: Network Analysis and Synthesis

  1. In a driving point function, the degrees of numerator and denominator polynomials in s may differ by either zero or one only.

  2. A.
    True
    B.
    False

  3. The sum of two sine waves of different frequencies is a sine wave.

  4. A.
    True
    B.
    False

  5. When iron rod is magnetised by the flowing through its coil, the polarities of its different points will be

  6. A.
    Pole A is N-pole, B is S-pole and C is neutral
    B.
    A is N, B and C is S
    C.
    A is N, C is S
    D.
    A is S, C is neutral, B is N

  7. Steady state conditions are considered to be achieved in R-L circuits at the end of __________ time constant.

  8. A.
    one
    B.
    two
    C.
    four
    D.
    five

  9. Two impedances are connected in series. Three voltmeters are connected, one across each impedance and one across combination. The readings of all the three are equal. The phase angle between voltages across the two impedances is

  10. A.
    30°
    B.
    60°
    C.
    90°
    D.
    120°

  11. In a series resonant circuit Q is more than 10. Then the lower half power frequency ω1, and resonant frequency ω0 are related as

  12. A.
    ω1 = ω0 + bandwidth
    B.
    ω1 = ω0 + 0.5 (bandwidth)
    C.
    ω1 = ω0 - 0.5 (bandwidth)
    D.
    ω1 = ω0 + bandwidth

  13. In a series R-L circuit when excited by a 1 volt battery the current is 1 - e-t. If it is excited by a source 2 sin t, the current will be

  14. A.
    2 sin (t - 45°) + e-t
    B.
    2 sin (t + 45°) + e-t
    C.
    sin (t - 45°) + e-t
    D.
    sin (t + 45°) + e-t

  15. If R, L, C are in parallel, the currents through L and C are equal in magnitude at resonance.

  16. A.
    True
    B.
    False

  17. In all pure metals, temperature coefficient of resistance is positive.

  18. A.
    True
    B.
    False