Three different design screw compressors are:
A) Single screw with gate rotors, dual screw, and triple screw.
B) Single screw, compound screw, and compound-complex screw.
C) Micro screw for small appliances, standard screw for 2—5-ton applications, and mega screw for industrial applications.
D) Open screw, semihermetic screw, and variable screw.
A
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Assume that an alloy of nickel with 2 wt. percent aluminum is cast and by metallographic examination, a dendrite arm spacing of 50 µ is observed. It is also determined that the composition difference between the center of an arm, and the midpoint between two arms is one percent. Estimate the time required for homogenization if the annealing temperatute is to be 1400°C and the compostion difference is to be reduced to one?tenth or its original value. Note: See Table 12.5.
What will be an ideal response?
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