Network Theory Objectives Part 02
21 . Power factor of pure inductor is zero.
22 . With some initial charge at t=0+ a capacitor will act as voltage source.
23 . Between the branch voltages of the loop the Kirchhoff law impose linear constraints.
24 . The characteristics of the open circuit on current – voltage plot is vertical line through origin.
25 . A linear resistor 0<R<infinity is a both voltage and current controlled
26 . Diode is neither current controlled nor voltage-controlled device.
27 . Superposition theorem is applicable to only linear responses.
28 . Superposition theorem is applicable to current and voltage but not on power.
29 . A star circuit has each element of resistance R/2, the equivalent delta element will be (3/2) R.
30 . Power in delta P(delta)= 3P(star) power in star.
31 . If one of the resistor in delta connection is removed, then total power will be reduced by 1/3
32 . For three phase star connected circuit, line current = phase current.
33 . For three phase delta connected circuit, line voltage = phase voltage.
34 . In three phase star connected circuit, line voltage = under root(3) phase voltage.
35 . In three phase delta connected circuit, line current = under root (3) phase current.
36 . In order to find Z in Thevenin’s theorem all independent voltage source are short circuited and all independent current sources are open circuited.
37 . Application of Norton theorem to a circuit yields equivalent current source and impedance in parallel.
38 . Millman’s theorem yields equivalent voltage and current source.
39 . Power consumed in a 3 phase delta connection is underroot(3) VL IL costheta
40 . In two phase system , the phase will differ by an angle of 90 degree.