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Gerry likes driving small cars and buys nearly identical ones whenever the old one needs replacing. Typically, he trades in his old car for a new one costing about Si 5 000. A new car warranty covers all repair costs above standard maintenance (standard maintenance costs are constant over the life of the car) for the first two years. After that, his records show an average repair expense (over standard maintenance) of S2500 in the third year (at the end of the year), increasing by 50% per year thereafter. If a 30% decliningbalance depreciation rate is used to estimate salvage values, and interest is 8%, how often should Gerry get a new car?
The ammonia is fed at 100 m^3/hr and the reaction is 80% complete. The NO is separated form the ammonia and water and recycled back as shown in the figure below. Calculate the volumetric flow rate (m^3/hr) of ammonia recycled at 150 C and 150 kPa.
Twenty pounds of a gas mixture is contained in a tank with volume 30 cubic feet at 30 psia and 70 F. The gas mixture has volumetric analysis of twenty percent carbon dioxide, thirty percent oxygen, and fifty percent nitrogen. Discuss how you would s..
a well insulated turbine operating at steady state develops 28mw for a system with flow rate of 50 kgs. the superheated
Calculate the radiation heat transfer coefficient for the vertical wall in Problem 16.21. assuming that the wall radiates into black surroundings at 15T. and the emissivity of the wail surface is 0.93. Compare this value with the heat transfer coe..
Calculate the cycle efficiency and the mean effective pressure when the pressure and temperature at the start of compression are I bar and 17 respectively. The compression ratio is I8/I.
A steam turbine is operating at a steady state with a mass flow rate of 3682 kg/h at the inlet. The power output of the turbine is 8700 kW. Steam enters the turbine at a pressure of 40 bar, temperature of 320 oC, and with a velocity of 13 m/s. The ex..
A closed system consisting of 1 lb of a gas undergoes a process during which the relation between pressure and volume is pV^n = constant. The process begins with p1=20 lbf/in^2, V1=10ft^3 and ends with p2=100 lbf/in^2.
1. steam is contained in a closed rigid container with a volume of 1 m3. initially the pressure and temperature of the
a straight fin of rectangular cross section fabricated from an aluminum alloy k 185wmk has a base thickness of t3mm and
In a four bar mechanism ABCD, AD is fixed and is 150 mm long. The crank AB is 40 mm long and rotates at 120 rpm clockwise, while the link CD = 80 mm oscillates about D. Link BC and AD are of equal length. Using the analytical/mathematical solution me..
Give the advantages and drawbacks of metal matrix composites over polymer matrix composites.
A single plate clutch with both sides of the plate effective is required to transmit 25 kW at 1600 r.p.m the outer diameter of the plate is limited to 300 mm and the intensity of pressure between the plate not to exceed 0.07 N/mm^2.
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