A 4-pole, 50 Hz, 3-phase induction motor has a rotor resistance of 0.3 Ω and standstill reactance of 1.8 Ω per phase. The slip at which maximum torque occurs is:

In a three-phase alternator, the factor that accounts for the reduction in induced EMF because the coils within a phase group are spread across several slots per pole is known as the ________.

Which factor is least significant in determining the rating of a distribution transformer?