Engineering, 07.08.2019 18:30 fatty18
Consider a 20 m long section of a cylindrical thin-wall duct with a diameter of 20 cm. hot air enters this duct at 70 c with an average velocity of 5 m/s. the outer surface of the duct is exposed to air at t? =15 c. assuming that: ? the duct surface is at an average temperature of 40 c throughout ? entrance region is very short compared with the length of the duct ? radiation from the outer surface is negligible find: a. the exit temperature of the air from this section of the duct. b. the heat transfer coefficient between the duct and air surrounding the duct.
Answers: 3
Engineering, 04.07.2019 18:10
The higher the astm grain-size number, the coarser the grain is. a)-true b)-false
Answers: 3
Engineering, 04.07.2019 18:10
What are the two (02) benefits, which may result from a successful implementation of preventive maintenance (pm) program in an organization? (clo3)a)- lean manufacturing b)-overlapping responsibilities c)-the planner is not qualified d)-accurate contractor information e)-reduction in equipment redundancies f)-accurate stores information
Answers: 3
Engineering, 04.07.2019 18:10
Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.
Answers: 1
Consider a 20 m long section of a cylindrical thin-wall duct with a diameter of 20 cm. hot air enter...
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