Practice problems
refer to the circuit shown in figure 17-2 and the resistive-inductive series circuits section of the ac
formulas listed in appendix b.
1. assume that the circuit shown in figure 17-2 is connected to a 40
snown in figure 17-2 is connected to a 480-v, 60-hz line. the inductor
has an inductance of 0.053 h, and the resistor has a resistance of 1
et 480v
er
el
i
n
r 12 12
x
od
va
varsl
pf
ce
l 0.053 h
a
+
+
+
answers

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.