Engineering, 14.09.2019 02:30 tatumleigh04
Chips of width l =1 inch on a side are mounted to a substrate that is installed in an enclosure whose walls and air are maintained at a temperature of tsur = t[infinity]=25c. the chips have an emissivity of ε=0.60 and a maximum allowable temperature of ts =87c. 4.a) if heat is rejected from the chips by radiation and natural convection, what is the maximum operating power of each chip? the convection coefficient depends on the chip-to-air temperature difference and may be approximated as h =c(ts – t[infinity]) 1/4, where c = 4.2 w/m2 /k5/4. this is empirical formula, so simply substitute and solve. no need to put into the formula sheet.
Answers: 3
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 03.07.2019 14:10
Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned
Answers: 2
Engineering, 04.07.2019 18:10
Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation
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Engineering, 04.07.2019 19:10
With increases in magnification, which of the following occur? a. the field of view decreases. b. the ambient illumination decreases. c. the larger parts can be measured. d. the eyepiece must be raised.
Answers: 1
Chips of width l =1 inch on a side are mounted to a substrate that is installed in an enclosure whos...
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