Engineering Answers

5.)  A plate 400mm wide and 0.03 mm thick with strength of 400Mpa is to shear. During shearing process a 1000mm mean diameter flywheel changes its speed from 220 to 200 rpm. Determine the weight of flywheel to be used. (Please show the solution of answer)

Answer: W=61.34KN

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. (Please show the solution of answer)

Answer: 9.74 kN-m    

2. Compute the maximum deflection of a 15 coils helical spring having a load of 80 kgs. The spring is a square and ground ends w/ modulus of elasticity in shear of 80 GPa, outside diameter of 100mm, wire diameter of 10mm. (Please show the solution of answer)

Answer: a. 74.375mm

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?

 In a porter governor the mass of the central load is 18 kgand the mass of each ball is 2kg. the top arms 250 mm while the bottom arms are 300 mm long. The friction of the sleeve is 20 N. If the top arms make 45 deg with the axis of rotation in the equilibrium position, find the range of the speed of the governor in that position

Consider the autocatalytic reaction A --+ R, with -rA = 0.001 CACR moll

1iter.s. We wish to process 1.5 litersls of a CAo = 10 mollliter feed to the

highest conversion possible in the reactor system consisting of four 100-

liter mixed flow reactors connected as you wish and any feed arrangement.

Sketch your recommended design and feed arrangement and determine

CAf from this system

7.) Flange bolt couplings consist of 10 steel 25 mm steel bolts spaced evenly around a bolt circle 400 mm in diameter. If the coupling is subjected to a torque of 20 kN-m, determine the maximum stress in the bolts?

8.) The energy required to punch a square from 30mm thick plate is 20KJ. If the ultimate strength of plate is 450Mpa, determine the maximum sides of square that can be punch.

Answer: S=24.69mm

6.) The power required to shear a plate 60mm thick for 20sec is 8KW. If the ultimate strength of plate materials is 4oo Mpa, How wide should the plate be?

Answer: b= 222.22mm

5.) A plate 400mm wide and 0.03 mm thick with strength of 400Mpa is to shear. During shearing process a 1000mm mean diameter flywheel changes its speed from 220 to 200 rpm. Determine the weight of flywheel to be used.

Answer: W=61.34 KN