### 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.**