An inductor has an inductive reactance of 12 ?, and a wire resistance of 16 ?. What is the impedance of the inductor?
A. 4 ?
B. 20 ?
C. 28 ?
D. 400 ?
Answer: B
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Which statement about the use of Peng-Robinson and Soave EOSs is incorrect?
A. A P-V-T relationship graph can be created for any compound if you have Pc, Psat|Tr = 0.7 and Tc. B. The Peng-Robinson and Soave equations can be used to model both liquid and vapor molar volumes, but not supercritical fluids. C. The Peng-Robinson equation of state is slightly more complex, but does not require any additional physical properties. D. The attraction variable is dependent on the temperature of the substance, but the repulsion variable is not. E. Both equations have identical repulsion pressure terms.
Wireways are ____ with hinged or removable covers used to house and protect electric wires and cables.
A. service boxes B. raceways C. non-metallic sheaths D. troughs (sheet metal or nonmetallic)
An example of stored energy in equipment or machinery is ___________________.
A. capacitor B. spinning wheel C. elevated weight D. a,b, and c
The resistance can be adjusted to permit the triac to fire when the AC waveform reaches its peak value. This will cause one-____ of the AC voltage to be dropped across the triac.
A. fifth B. fourth C. third D. half