A centrifugal compressor uses ____ for capacity control.
A. guide vanes
B. block vanes
C. guide blocks
D. control vanes
Answer: A
You might also like to view...
Discuss why weather information is important for project documentation.
What will be an ideal response?
____ wrenches use fractions of an inch, such as 1/2 inch, 9/16 inch, or 5/8 inch.
a. Metric b. SAE c. European d. Select
Which of the following statements is accurate?
An ammonia synthesis process 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 a fraction of the entering nitrogen and hydrogen are converted into ammonia. 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 almost pure ammonia, is the product. A fraction of the vapor stream leaving the condenser is purged, while the rest is recycled. A. Raoult’s Law would be a reasonable way to model the VLE for ammonia in the condenser. B. Henry’s Law would be a reasonable way to model the VLE for oxygen in the condenser. C. If we increase the size of the reactor, allowing a larger fraction of the nitrogen and hydrogen to be converted to ammonia, it won’t lead to an increase in the liquid product flow rate, because the product flow rate is limited by the equilibrium constraint in the condenser. D. If we maintain the same flow rate of entering feeds, but we purge a smaller fraction of the vapor leaving the condenser, then the mole fraction of oxygen in the purge stream will go down. E. None of the above are true.
When gutters are installed on a metal roof, the gutter material should be compatible with the roof metal to avoid ____ that occurs between different materials.
A. galvanic corrosion B. rust C. friction D. decay