The ____________________ may be described as an alternating-current device that transfers energy from one ac circuit to another ac circuit.
Fill in the blank(s) with the appropriate word(s).
transformer
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Ladders used to provide access to deck-forming levels must extend above the formwork at least _____.
a. 1 foot b. 2 feet c. 3 feet d. 4 feet
When comparing electric discharge luminaries to incandescent lamps, the heat produced by incandescent lamps is usually ____________________ (less/greater).
Fill in the blank(s) with the appropriate word(s).
Which of the following would you NOT expect to be true at the new steady state (compared to normal operation)?
An ammonia synthesis process normally works as follows: Fresh feed air and hydrogen are combined with a recycle stream and the combined stream is compressed to 10 MPa. The compressed stream enters a reactor, and the entering nitrogen and hydrogen are converted into ammonia until the reaction reaches equilibrium. The reactor effluent, still at 10 MPa, enters a condenser. The liquid and vapor streams leaving the condenser are in VLE. The liquid stream, which is essentially pure ammonia, is the product. A fraction of the vapor stream leaving the condenser is purged, while the rest is recycled. There is a problem with the compressors and the pressures of the reactor and the condenser both drop to 9 MPa. The fresh feed rate and the fraction of vapor leaving the condenser that is purged each remain the same, as do the reactor and condenser temperatures. The system reaches a new steady state at 9 MPa. A. The mole fraction of ammonia in the vapor being purged will be higher than in normal operation. B. The extent of reaction will be lower than in normal operation. C. The mass flow rate of liquid product will be lower than in normal operation. D. The composition of the purge stream will change, but its mass flow rate will remain the same as in normal operation. E. All of the above would be expected to occur.
Metal stairways are completely fabricated _____
a. off site b. on the lower level of the building under construction c. from the top down d. on the upper level of the building under construction