Problems
Author: E.E. Kimberly

Problem 
Answer 
1 
A 40hp, 230volt shuntwound motor has an armaturecircuit resistance of 0.11 ohm. Calculate the series startingbox resistance necessary to limit the starting current to 1.5 times the rated running current. See Appendix for fullload current. 

2 
A motor name plate gives the following information: 7.6/9 hp, 115 volts, 56/68 amp, 900/1200 rpm, 100% load, 24 hours 50 C.
(a) What is the rated speed at 9 hp, full load?
(b) What is the significance of the double speed specification?
(c) What is the significance of the double current rating?
(d) What is the significance of the temperature rating?


