NSA192008 Pages:4

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Module-II

An alternating current varying sinusoidally with a frequency of 50112 has
an rms value of 20A.
i) Write down the equation for the instantaneous current
ii) Find the instantaneous value of current at 0.0025s.
iii)Find the instantaneous value of current 0.125s after passing through a
positive maximum value
iv) At what time, measured from a positive maximum value, will the
instantaneous current be 14.14 A?

OR
Determine the average and rms values of the triangular voltage wave

having maximum value एक volt as shown in figure.

Module-III
Two impedances Z; and 7) when connected separately across a 220%, 50
Hz supply, consume 300W and 150W at a power factor of 0.4 lagging and
0.7 leading respectively. When the two impedances are connected in series
across the same supply, find total power consumed and overall power
factor.
OR

A balanced three phase load has per phase impedance of (30+j50) Q. If the
load is connected across 400V, 3 phase supply, find (i) phase current (11)
line current and (iii) power supplied to load when it is connected in (a) star

(b) delta.

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