The effective operation of punch presses, high inertia machines, pumps, and centrifugal fans require __________ load characteristics.
A. constant torque
B. constant horsepower
C. variable torque
Answer: C
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The New England Confederation
A. included all the New England colonies. B. was designed to bolster colonial defense. C. led the American colonies to seek independence from England. D. was created by the English government to streamline its administration of the colonies. E. was an economic and trade alliance.
Proper grounding helps protect against ____ currents, electrical noise, and lightning strikes.
a. continuous b. transient c. transformed d. closed loop
Electro-hydraulic actuators/operators must be installed in a(n) ________
A) underwater location B) horizontal position C) vertical position D) indoor location
For the circuit shown in Figure P5.41, assume that switches S1 and S2 have been held open and closed, respectively, for a long time prior to t = 0. Then, simultaneously at t = 0, S1 closes and S2 opens. Also
assume
R1 = 5?, R2 = 4?, R3 = 3?, R4 = 6?, and
C1 = C2 = 4F.
a. Find the capacitor voltage vC at t = 0+.
b. Find the time constant ? for t > 0.
c. Find vC for all time and sketch the function.
d. Evaluate the ratio vC to vC (?) at each of the following times: t = 0, ?, 2?, 5?, 10? .
