The motor is loaded by a unidirectional constant-torque load of 40 Nm. A countercurrent braking is performed on the motor. Calculate the following:
A 60 Hz, 480 V, three-phase, Y-connected induction machine has the following
parameters:
a. Motor current before the countercurrent braking
b. Motor current just after the voltage sequence is reversed
c. Current at the moment when the motor stops
d. Motor torque at the condition of part (c)
e. Motor current at the new steady-state point
f. Motor torque at the new steady-state point
g. Motor speed at the new steady-state point
Solution:
Therefore, to find the current, the slip has to be found first:
Using the small slip approximation (Eq. 5.75)
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In the case of a back weld, the back weld is made first and then a groove weld is applied.
Answer the following statement true (T) or false (F)
Marie raised 554 pounds of green beans to sell. She sold 14 percent to friends who picked the beans for $1.10 per pound. She sold the 2 CHAPTER 11 • Gardening © 2012 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. rest at the Home Grown Market for $1.49 per pound. She had a 9.8 percent loss on unsold beans at the Home Grown Market.
a. How many pounds of beans were sold to friends? b. What was the income received from the sale of beans to friends? c. How much income did she receive from the sale of the green beans?
Use mesh analysis to find current io in the circuit of Fig. 10.74.
 FIGURE 1.png)
Let
