ms, be sure to label each side of
the triangle showing magnitude and units, and label the power factor angle ( ) in
degrees.


1.
A motor is producing 87 horsepower. Its efficiency is 92% and its power factor is 88%
lagging.

a.

Draw a block diagram showing the power input to the motor and the power output
from the motor.

b.

What is the motors output in kW?

c.

Draw the power triangle for the motor.

d.

If a total of 18 kvar of capacitance is connected in parallel at the motor terminals,
what power factor will be seen by the source?




2.

An inductive load draws 8700 kW and 6250 kvar.

a.
Draw the power triangle.

b.
What power factor is seen by the source?

c.

How much capacitance (in kvar) must be paralleled with the load to raise the
power factor seen by the source to 95% lagging?

d.
Draw the power triangle including the capacitors added in part c.

e.
Capacitors suitable for this application are available in 600 kvar increments.
Assuming a desired corrected power factor of 95% lagging, how many kvar of
capacitance should be put in parallel with the load?

f.
Based on your answer to part d, what power factor would be seen by the source
after the capacitors are added?

g.
Draw the power triangle including the capacitors added in part f.