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1. A tensiometer is used to measure a compacted soil in the field that has a matric suction of 200 kPa under atmospheric conditions. The pore-water pressure measurement in the tensiometer reaches -99 kPa and suddenly increases to zero. Briefly explain the problem encountered in this measurement.2. A tensiomater is used to measure a soil specimen in the labaratory that has a constant matric suction of 30 kPa under atmospheric conditions. In the beginning the pore-water pressure measurement in the tensiometer reaches -30 kPa, but after a few days the meausrement drifts to a higher pore-water pressure. Briefly explain the problem encountered in this measurement.3. A homogeneous coarse sand deposit has a water table at 10 m depth. The water coefficient of permeability of the sand is found to vary significantly with height above the water table even though the sand deposit is homogeneous. Briefly explain the reason for the variation of the water coefficient of permeability above the water table.4. A soil is to be compacted on a site and it is expected that the soil contains a high percentage of montmorillonite.(i) Briefly explain the working principles of two test that can be carried out to ascertain the presence of montmorillonite in the soil.(ii) Should the soil be compacted at the dry of optimum or at the wet of optimum condition in order to minimize swelling potential? Briefly explain the reason for your answer.5. Measurements of pore-water pressure in soils are affected by time lag, cavitation and air diffusion. Briefly explain the meaning of these processes and how they affect the pore-water pressure measurements.
HOCL is added to water in a tank as a disinfectant. After equilibrium is reached it is found that the pH of the water in the tank is 8.2 and the gas phase partial pressure is the head space of the tank is 0.2E-7 atm.
A car travelling at 60 mph in a construction area skids into a stack of concrete barriers. Skid marks leading to the crash measures 150 ft .
Discuss the advantages and disadvantages of using 8-bit and 10-bit resolution for the analog-to-digital converter.
A vertical curve is formed when a rural highway passes under a bridge joining a -8% grade to the horizontal grade satisfying the requirement for safe speed of 90 Km/hr . Determine the minimum clearance required betewen the highway pavement surface..
What are minerals? Sketch different types of mineral crystal forms and list different types of rock forming minerals. Describe with examples the importance of mineral identification in engineering applications.
A structural steel beam is attached to a column with bolts. The downward force on the connection is 150 kips. What bolt sizes must be used if the allowable shear stress is 25.0 ksi
how many students have heights (a) greater than 72 inches, (b) less than or equal to 64 inches, (c) between 65 and 71 inches inclusive, (d) equal to 68 inches. Assume the measurements to be recorded to the nearest inch.
A 10-min experimental run shows that 75% of a reactant is converted to a product by a zero-order reaction rate. What would be the fraction converted in a half-hour run. Assume the reactor is a batch reactor.
A stainless steel pipe (k= 17 W/m?C) is being used to convey heated oil. The inside surface temperature is 130?C. The pipe is 2 cm thick with an inside diameter of 8 cm. The pipe is insulated with 0.04 m thick insulation
A lagoon with volume 1200 m3 has been receiving a steady flow of a conservative waste at a rate of 100 m3/day for a long enough time to assume that steady-state conditions apply.
Gasoline is being discharged from a pipe at point 2 at elevation 66.66 m. Pint 1, located 965.5 m along the pipe from point 2, is at elevation 82.65 m, and the pressure there is 2.50 kPa.
For the following waste and river characteristics just upstream from the outfall, find the minimum downstream DO that could be expected
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