Engineering, 16.11.2019 06:31 samantha9014
Ahypothetical metal alloy has a grain diameter of 1.7 ´ 10-2 mm. after a heat treatment at 450°c for 250 min the grain diameter has increased to 4.5 ´ 10-2 mm. compute the time required for a specimen of this same material (i. e., d0 = 1.7 ´ 10-2 mm) to achieve a grain diameter of 8.7 ´ 10-2 mm while being heated at 450°c. assume the n grain diameter exponent has a value of 2.1.
Answers: 2
Engineering, 03.07.2019 19:30
When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line
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Engineering, 04.07.2019 18:20
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.
Answers: 2
Engineering, 04.07.2019 18:20
Aheavily insulated piston-cylinder device contains 0.02 m3 of steam at 300 kpa and 200 °c. 1.2 mpa. d this process. team is now compressed in a reversible manner to a pressure of etermine the entropy change and the work done on the steam during this process
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Engineering, 04.07.2019 19:20
Acircular pipe of 30mm outside diameter is placed in an airstream at 30 c and latm pressure. the air moves in cross flow over the pipe at 20 m/s, while the outer surface of the pipe is maintained at 110 c. what is the drag force exerted on the pipe per unit length? what is the rate of heat transfer from the pipe per unit length?
Answers: 1
Ahypothetical metal alloy has a grain diameter of 1.7 ´ 10-2 mm. after a heat treatment at 450°c for...
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