Engineering Answers

Calculate the i) specific weight, ii) mass density, iii) specific gravity and iv) specific volume oil the oil having a volume 4 500 litres and a weight of 40 kN.

If a liquid has a viscosity of 0.051 poise and a kinematic viscosity of 0.14 stokes, calculate its specific gravity.

Oil flows from a tank through a 50 mm diameter pipe. If the average velocity is 1.3 m/s, determine how long it will take for 2500 kg of oil to flow out. Take S.G (oil) = 0.78

In an experiment on a venturi meter installed in a 300 mm diameter pipe, the mercury in the differential U-tube manometer connected to the venturi meter deflects 73 mm when 73 l/s of water is flowing in the pipe. If the diameter of the throat of the venturi is 150 mm, calculate Cd for the venturi

A 250 mm diameter pipe carrying 30 l/s of water suddenly enlarges to 400 mm diameter. Find the headloss due to the sudden enlargement.

𝑦" + 3𝑦′ + 2𝑦 = 𝑓(𝑡); 𝑦(0) = 0, 𝑦′(0) = 1

𝑓(𝑡) ቄ

1, 0 ≤ 𝑡 < 3;

0, 𝑡 ≥ 3.

Find the discharge through a trapezoidal notch which is 1 m wide at the top and 0.4 m at the bottom and is 300 mm in height. The head of water on the notch is 200 mm. Assume Cd for the rectangular portion is 0.62 while for the triangular portion is 0.6.

A piece of equipment that was purchased 2 years ago by Toshiba Imaging for $50,000 was expected to have a useful life of 5 years with a $5000 salvage value. Its performance was less than expected, and it was upgraded for $20,000 one year ago. Increased demand now requires that the equipment be upgraded again for another $17,000 so that it can be used for 3 more years. If upgraded, its annual operating cost will be $27,000 and it will have a $12,000 salvage after 3 years. Alternatively, it can be replaced with new equipment priced at $65,000 with operating costs of $14,000 per year and a salvage value of $23,000 after 6 years. If replaced now, the existing equipment will be sold for $7000. Determine the values of P, S , AOC, and n for the defender in a replacement study. 

A concrete pipe of diameter 1 000 mm is laid at a slope of 1 in 100. Estimate the rate at which the water will run down the pipe so that it remains uniformly half full. Use C = 49 SI Units.

An asset that was purchased 3 years ago for $100,000 is becoming obsolete faster than expected. The company thought the asset would last 5 years and that its book value would decrease by $20,000 each year and, therefore, be worthless at the end of year 5. In considering a more versatile, more reliable high-tech replacement, the company discovered that the presently owned asset has a market value of only $15,000. If the replacement is purchased immediately at a first cost of $75,000 and if it will have a lower annual worth, what is the amount of the sunk cost? Assume the company’s MARR is 15% per year.