An induction motor having full load torque of $$60$$ $$Nm$$ when delta-connected develops a starting torque of $$120$$ $$N$$-$$m.$$ For the same simply voltage, if the motor is changed to star-connection, the starting torque developed will be

When the supply voltage to an induction motor is reduced by $$10\% $$, the maximum torque will decrease by approximately

In an induction motor, if the air gap is increased

In case of a split phase motor, the phase shift between currents in the two windings is around