Final answer:
If the resistance of the rotor bars of an induction motor is increased slightly, it would decrease the motor's starting torque and starting current, while improving its speed regulation.
Step-by-step explanation:
If the resistance of the rotor bars of an induction motor is increased slightly, it would have the following effects:
a) Starting torque: The starting torque of the motor would decrease. This is because an increase in resistance would lead to a decrease in the current flowing through the rotor bars, which in turn would result in a decrease in the electromagnetic force and hence the torque.
b) Starting current: The starting current of the motor would also decrease. As the resistance is increased, the current flowing through the rotor bars would decrease according to Ohm's Law.
c) Speed regulation: The speed regulation of the motor would improve. Speed regulation refers to how well the motor maintains a constant speed under varying load conditions. With an increase in resistance, the motor would be able to better adjust its speed to counteract load changes, resulting in improved speed regulation.