QUESTION $5$

A $60$ Hz $450$ V induction motor, three phase, has the following parameters: $R1=R{2}^{\text{'}}=0\mathrm{.}005$ Ohms, xeq$=0\mathrm{.}2$Ohms and is a six pole machine. At full load the motor speed is $1150$ rpm $,$ the rotational losses are $350$ Watts and the core loss is $2000$ Watts. Find:

a$.$ Slip

b$.$ Developed torque at full load

c$.$ Starting torque of the motor

d$.$ Rotor Current

e$.$ Starting current of the motor

f$.$ Motor Efficiency

g$.$ How is the starting torque and starting current changed if a resistance of $0\mathrm{.}5$ Ohm is added to the rotor circuit.

h$.$ How do parts $b$ and $c$ compare to the maximum torque of the machine?