SSC JE Electrical Engineering 2015 Paper

Question : 139 of 199

Marks: +1, -0

If static voltage of a squirrel cage induction motor is reduced to 50 percent of its rated value, torque developed is reduced by how many percentage of its full load value?

50%
25%
75%
57.7%

Validate

Solution:

Torque

αv^2

if starter voltage reduced to 5090 of its rated value

V_2 = 0.5 V_1

T_1 = (V_1)^2

T_2 = (–5V_1)^2

T_2 = 0.25T_1

i.e. Torque will reduce 75%

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