delta connected squirrel cage induction motor

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Joined Mar 17, 2015
The following set of results was obtained for a delta connected squirrel cage induction motor with a line to line voltage of 400V. Calculate the efficiency of this motor, plot a graph of the results and explain your findings.

Hello, I've got this problem and I've been able to work out the output power using the formula P= (2pi * Torque * speed) / 60 and I also think I have work out the input power but I'm not sure if I'm doing right since I am getting a very very low efficiency for each reading. I have used the formula P = sqrt(3) * I_L * V_L * PF.

Is the efficiency suppose to be that low? Thank your very much for your help