Engineering, 18.12.2019 00:31 nataluarenhg6924
Consider a computer that reads data from a network card. the cpu clock frequency is 3 ghz. the cpu uses a polling strategy to access data from the network card, and, on each access, 32 words are transferred from the network card to memory through the processor (one word at a time) (a) assuming 60 cpu cycles of overhead for the polling procedure (calling the polling routine, accessing the device, and returning), and 2 cpu cycles for each word transfer, what percentage of cpu time is spent in polling the network card if we want to achieve the maximum card-to-memory data transfer rate (i. e. with the processor doing nothing other than polling and transferring data)? what is this maximum transfer rate in bytes per second? (6) if we want to limit the cpu time spent on polling and transferring data to 0.15%, how frequently should the cpu be polled (polls per second)? (c) for the polling rate obtained in part (6), what is the rate of data transfer from the network card to the memory (in bytes per second).
Answers: 2
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, 04.07.2019 18:10
For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater
Answers: 3
Engineering, 04.07.2019 18:10
Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.
Answers: 2
Engineering, 04.07.2019 18:10
You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?
Answers: 1
Consider a computer that reads data from a network card. the cpu clock frequency is 3 ghz. the cpu u...
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