Engineering Answers

3.) During a punching process of 350 kg flywheel the speed varies 250 to 220 rpm with 1.2m mean diameter. Determine the kinetic energy needed.

Answer: 9.74 kN-m

1. Determine the accumulated value of P2000.00 in 5 years if it is invested at 11%

compounded quarterly. (Please show solution with correct answer)

3. A machine costs P20,000 today. If inflation rate is 6% per year and interest is 10% per

year, what will be the appropriate future value of the machine, adjusted for inflation, in

five years? (Please show solution with correct answer)

An open flat belt is to transmit 8 kW. The small pulley has a diameter of 175 mm and rotates at 810 r/min, whilst the large pulley runs at approximately 250 r/min. Both pulleys have a width of 110 mm. The centre distance between the pulleys is 800 mm. Assume a factor of safety of eight (8) and an ultimate tensile stress for the flat belt material of 20 MPa. Assume µ = 0.35.

200 kg/min of feed are fed to a continuous distillation column. The stream contains 70 kg /min NaOH and the difference is water. The distillate flows out of the column at 90 kg /min and contains 4 kg /min NaOH. Determine the bottom stream mass flowrate and the composition of all streams. Draw and label the flowchart.

An open flat belt is to transmit 8 kW. The small pulley has a diameter of 175 mm and rotates at

810 r/min, whilst the large pulley runs at approximately 250 r/min. Both pulleys have a width

of 110 mm. The centre distance between the pulleys is 800 mm. Assume a factor of safety of

eight (8) and an ultimate tensile stress for the flat belt material of 20 MPa. Assume µ = 0.35.

2.1 Specify a belt; i.e. the width, thickness, length and grade

2.2 Calculate a suitable initial tension.

a 60 mm diameter pipe contains glycerine at2 20 c flowing at 8.5 m3/h. verify that the flow is laminar. for the pressure measurements hown, is the flow ascending or descending? what is the head loss for these pressure? take p glycerine = 1258 kg/m3, U glycerine = 1.49, g = 9.807

Two parallel rectangular surfaces 1m ×2m are opposite to each other at

a distance of 4m, The surfaces are black and at 100°C and 200°C.

Calculate the heat exchange by radiation between the two surfaces

Use Raoult's Law and calculate the vapour and liquid compositions in equilibrium (in mole fractions, y and x) for the A-B components system using vapour pressure data measured at a pressure of 101.32 kPa as shown in Table 1 below. Draw the Temperature composition diagrams the Equilibrium distribution (x-y) plot as well.

Table 1: vapour pressure data measure

Temperature

60

78

86

92

96

101

Vapour pressure

Component A

101.325

132

156

178

195

235

Component B

0

58

68

78

88

101.325

Methanol (M) is to be separated from water (W) by atmospheric distillation. The feed contains 22 kg/hr methanol and 25 kg/hr water. The distillate contains 90 mol% methanol and the bottom product contains 5 mol% of methanol. The feed is saturated.

(a) Calculate the molar flow rates of methanol and water in the bottom and distillate product stream.

(b) Determine the minimum number of stages and minimum reflux for the problem. If the equilibrium data is given as;

x 0.032 0.0523 0.075 0.154 0.225 0.349 0.813 0.918 1

y 0.19 0.2494 0.352 0.516 0.593 0.703 0.918 0.953 1