Good Luck! Problem 1/ A vertical glass cylinder contains 850 ml of water at 20 °C; the height of the water column is 70 cm. The water and its container are heated to 70 °C. Assuming no evaporation, what will be the height of the water if the coefficient of thermal expansion for the glass is 3.5 x 10-6/°C?

Question 3 A 2L, 4-stroke, 4-cylinder petrol engine has a power output of 113.9 kW at 5500 rpm and a maximum torque of 235 N-m at 3000 rpm. When the engine is maintained to run at 5500 rpm, the compression ratio and the mechanical efficiency are measured to be 8.9 and 83.2%, respectively. Also, the volumetric efficiency is 93.1 %, and the indicated thermal efficiency is 43.76 %. The intake conditions are at 36.9 °C and 1.00 bar, and the calorific value of the fuel is 44 MJ/kg Determine the Air-Fuel ratio in kg/kgf at 5500 rpm. Use four (4) decimal places in your solution and answer.

A small lake with volume 10,000 m3 has a stream flowing into it with flow rate 100 m3/day and a Toluene concentration of 1.0 mg/m3. A factory discharges 5 m3/ day into the lake with Toluene concentration of 10 mg/m3 - they want to increase effluent to 50 mg/m3. Toluene decays at a rate of 0.01 day-1. Assume steady-state and completely mixed (CSTR). a) How would this increase in discharge concentration change the lake concentration? Answer: 0.73 mg/m3 before, 1.71 mg/ m3 after b) Field studies show that the same lake would be better represented by dividing the lake into two cells. The first cell having a volume of 2,500m3 and the second with 7,500m3. How does this affect the estimate of concentration leaving the lake? Compare with one- cell model. Assume the factory continues to discharge at 10 mg/m3 into the first cell.