Explain how the impeller vanes, diffuser, volute, and drive shaft operate together.
What will be an ideal response?
During operation, air enters the compressor at the suction inlet and is accelerated by moving impellers. Compressor-100 has one moving element, the drive shaft and impeller. In the compressor the impeller discharges into a circular, narrow chamber called the diffuser. This narrow opening completely surrounds the impellers. As back-pressure builds in the compression chamber, gas velocity is accelerated through the diffuser assembly and into a circular volute. As high-velocity gas moves through the diffuser and into the volute, kinetic energy is converted into pressure as gas speed slows in the ever-widening volute before exiting the discharge port.
Because compressor performance is linked to the compressibility of the gas or air it is moving, centrifugal compressors are more sensitive to density characteristics than positive displacement compressors.
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Why would a company seek ISO 9000 certification?
A) Many governments require certification B) Allows companies to compete globally C) Customer support is more efficient D) Certification provides liability
The space at the top of the cylinder when the piston reaches the top of its stroke is called ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following companion birds have the shortest average life span?
A. Cockatiels and Amazon parrots B. Eclectus parrots and macaws C. Quaker (Monk) parakeets and macaws D. Canaries and Lovebirds E. Cockatiels and parrotlets
What are the broad areas that commercial refrigeration equipment is grouped in based on the evaporator coil temperature?
A) Perishable frozen and perishable non-frozen B) Frosting, non-frosting, and defrosting C) Refrigerator and freezers D) High, medium, low, and cryogenic temperatures