SSC JE Electrical Engineering 2012 Paper

Question : 111 of 200

Marks: +1, -0

A current of i = 6 + 10 sin (100 πt) + 20 sin (200 πt) is flowing through a series combination of a PMMC and moving iron instrument. Ratio of the two currents as registered by the m.i. and PMMC meter is

1.81
3.11
2.82
2.63

Validate

Solution:

i = 6 + 10 sin (100 πt) + 20 sin (200 πt)
PMMC read only DC value.

(I)_\PMMC = 6

For M.I.

(\I)_\MI

=√{I_0^2+1/2(I_1^2+I_2^2+...)}

=√{6^2+1/2(10^2+20^2+...)}

= 16.91

I_\MI/I_\PMMC=16.91/6=2.82

Go to Question:

Prev Question

Next Question