The design for a 1/8 -hp, two-pole, 115-V universal motor gives the effective resistances of the armature and series field as 4 % and 6 %, respectively. The output torque is 0.17 N-m when the motor is drawing rated current of 1.5 A (rms) at a power factor of 0.88 at rated speed. Find:
a. The full-load efficiency.
b. The rated speed.
c. The full-load copper losses.
d. The combined windage, friction, and iron losses.
e. The motor speed when the rms current is 0.5 A, neglecting phase differences and saturation.