ENGINEERING FUNDAMENTALS
ENGINEERING FUNDAMENTALS
6th Edition
ISBN: 9781337705011
Author: MOAVENI
Publisher: CENGAGE L
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Chapter 12, Problem 26P

As you know, a fuse is a safety device that is commonly placed in an electrical circuit to protect the circuit against excessive current. Investigate the various types of fuses, their shapes, materials, and sizes. Write a brief report discussing your findings.

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1. The particulate emissions were measured from a factory stack. The stack was divided into three sectors with different cross-sectional areas. The measured velocities and particulate concentrations were given below. Sector number 1 2 3 Cross-sectional Stack velocity area (m²) (ft/s) 1.0 60 1.2 45 1.4 55 Particulate concentration (mg/m³) 450 530 610 a) What is the average particulate concentration in mg/m³? b) What are the particulate emissions per unit area in g/m²-s for sector number 1, 2 and 3? c) What are the flow rates of particulates in g/s for sector number 1, 2 and 3?
An urban county with an area of 1,000 mile² has an estimated 18 million miles of vehicular traffic per day and has a large power plant. The power plant produces 350 MW of electricity at an efficiency of 39%, burning 10,000 Btu/lb coal. The vehicle emission factor for VOCs is 6 grams/mile; the coal-fired boiler emission factor for VOCs is 1.4 lb/ton coal; biogenic emission of VOCs is 0.4 kg/km²-hr on the average. Determine the total emissions of VOCs in tons/day from all sources (mobile, power plant, and biogenic).
For automobile, gasoline is a complex mixture of relatively volatile hydrocarbon blended for use in spark-ignition engines. Every time fuel is burned, the carbon is converted to carbon dioxide (CO2), the natural end product of combustion. If we approximate the chemical  formula for gasoline by the compound octane (C8H18) with a density of 739 grams/liter, the stoichiometric reaction for complete combustion is: C8H18 + 12.5O2  8CO2 + 9H2O Thus, for every mole of C8H18 fuel that is burned, eight moles of CO2 are produced, along with nine moles of water vapor. Estimate the CO2 emission in grams per mile for a car getting 12 km/liter of gasoline.
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