The unit of measurement for the porosity of fabric duct is _____
a. cfm/ft2 of surface area
b. cfh/ft2 of surface area
c. cfm/lineal foot of duct material
d. cfh/lineal foot of duct material
a
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In the brushless DC exciter, the commutator of a conventional direct-connected exciter is replaced with a threephase, bridge-type, ____.
a. solid-state rectifier b. controlled rectifier c. direct transformer d. small rectifier
In the PCV system, crankcase vapors are recycled to the:
A. exhaust system. B. air cleaner housing.. C. oil-breather cap. D. intake manifold.
Which of the following is a correct analysis of the isothermal reactor, compared to the adiabatic reactor?
A feed stream of 50 mol% A and 50 mol% B at 500 K enter an adiabatic steady state reactor. The reaction is A + B ? C and occurs in the liquid phase. The stream leaving the reactor is at 545 K, and is at equilibrium. An engineer proposes adding temperature control to the reactor, so that it is instead an isothermal reactor at 500 K.
For t < 0, the circuit shown in Figure P5.39 is at DC steady state. The switch is closed at t = 0. Determine the voltage vC for all time. Assume:
R1 = R3 = 3?, R2 = 6?, V1 = 15V, and C = 0.5F.
