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1. An air compressor receives air at 290 K, 100 kPa and brings it up to a higher pressure in an adiabatic process. The actual specific work is 210 kJ/kg, and the isentropic efficiency is 82%. Find the exit pressure and the second-law efficiency.
2. A flow of 2 kg/s water at 1000 kPa, 80?C goes into a constant-pressure boiler, where the water is heated to 400?C. Assume the hot gas that heats the water is air coming in at 1200 K and leaving at 900 K, as in a counter flowing heat exchanger. Find the total rate of irreversibility in the process and the second-law efficiency of the boiler setup.
What pressure gradient along a streamline, dp/ds, is required to accelerate water upwards in a pipe at 0.5 m/s^2 ? The incline is 1:10, i.e., 1 m upward for every 10 m horizontal.
The aluminum bar has an electrical coil imbedded in it, so that known amounts of heat can be transferred to it. Aluminum has a specific gravity of 2.70 and a specific internal energy given by the formulaU (kJ/kg)=0.94T(C).
Assuming constant acceleration, determine how long the train blocked the crossing. Dis- regard the width of the crossing.
A rectangular channel of 2 m depth and 5 m width carries 1 m deep running water. It is laid to a slope of 0.001 with Manning's n = 0.02. Some distance downstream there is a hump of height 0.5 m on the stream bed.
The sum of the mole fractions for an ideal-gas mixture is equal to 1. Is this also true for a real-gas mixture?
A concrete hollow box culvert is shown in Figure P14.12. A basement for a building is required near the culvert. One proposal is to construct a sheet pile wall to surround the excavation, as shown in Figure P14.12, and pump out the water in the ex..
At the minimum volume reached during shrinkage, a specimen of soil has a void ratio of 0.87. if Gs = 2.72, calculate the shrinkage limit
A particle is traveling in a straight line at a constant speed of 22.9 m/s. Suddenly, a constant force of 10.7 N acts on it, bringing it to a stop in a distance of 63.6 m.
A waste heat source is available at 400°C. A heat engine operates using heat from this source. It rejects heat to the surroundings at 38°C. The power from the engine runs an air conditioner to keep the air inside a building at 25°C
We know that the molar concentration and volume of a solution is the sum of the product of the molar concentration and volume of each solution component before mixing
Explain the Methods of damp proofing
ABC is a triangular tract of land. The 1.5 tract DEFG is to be subdivided. AE is 480ft and DC is 350 ft. Determine the lengths of DG and CB. (Note 1 acre= 43,560 f^2)
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