By using VFDs or soft starters etc can we stop and finish the starting torque of motors (which almost about 3 times or more than 3 times of the rated load of the motor) ?
Yes.
Star connected motor has "Lower" voltage connected over its windings; Delta connected motor has "Higher" voltage connected over its windings. - Hence the torque differs.
Yes.
Star connected motor has "Lower" voltage connected over its windings; Delta connected motor has "Higher" voltage connected over its windings. - Hence the torque differs.