SSC JE Electrical Engineering 2013 Paper

Question : 115 of 200

Marks: +1, -0

A balanced 3-phase, 3-wire supply feeds balanced star connected resistors. If one of the resistors is disconnected, then the percentage reduction in load will be

33.33
50
66.67
75

Validate

Solution:

3-phase balance start resistance

P=V_L^2/R

If one resistor is disconnected

P=V_L^2/{2R}

% reduction

={{V_L^2}/R-V_L^2/{2R}}/{V_L^2/{2R}}=50%

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