Discuss the hazards that can effect from control valve failure

Two water reservoirs are joined by a sharp ended flexible pipe 100 mm in diameter and 36 m long. The ends of the pipe differ in level by 4 m. The surface level of the upper reservoir is 1.8 m above the pipe inlet whilst that of the lower reservoir is 1.2 m above the pipe outlet. At a position 7.5 m horizontally from the upper reservoir, the pipe is required to pass over a barrier. Assuming that the pipe is kept straight between the inlet and the top of the barrier and that the average friction factor is 0.01, find the greatest height to which the pipe may rise at the barrier if the absolute pressure in the pipe is not to drop below 40 kN/m2. You may ignore losses at the bends in the pipe but all other losses should be included in the calculation. Use values for k as given in the lecture notes. Take atmospheric pressure as 1.013 bar. (ans.: 6.04 m above inlet)

A pipe, 900 m long and 200 mm in diameter discharges water to the atmosphere at a point 10 m below the inlet level. With an inlet pressure of 40 kPa gauge, the flow rate is 40 litres/sec. At a point half way between the pipe inlet and outlet, a new tapping is made from which water is taken at a rate of 18 litres/sec. To what value must the inlet pressure be raised in order to maintain the same discharge rate from the end of the pipe? You may assume that the pipe remains full of water and that the average friction factor is not altered by making the new tapping. (ans.: 115.1 kN/m2)

A pressure vessel support bracket is to be designed so that it can withstand a tensile loading cycle of 0-500 MN/m2 once every day for 25 years. Which of the following steels would have the greater tolerance to intrinsic defects in this application: (i) a maraging steel (Ke-82 MNm-, C= 0.15 × 10-11, m-41), or (ii) a medium-strength steel (Kic 50 MN m1, C0.24x 10-", m 3.3)? For the loading situation a geometry factor of 1.12 may be assumed.

Write 10 steps to make more efficient manufacturing process than vacuuming machine we used?

Q3 An engineer in the maintenance department after presenting a Gh¢5000 scheduled activities to management was given Gh¢4600 to carry out the exercise. Explain what he can do in order to perform the said exercise on time?

A 1000kg uniform wheel shaped piece of steel is at rest. A 1kW engine turns the wheel with its full power.radius of disk is .3m

What rpm will it reach in 1 hour, 6 hours, 12 hours.

Assume no friction from air or bearings. Assume the most efficient continutously variable transmissions if needed.

After 12 hours of charging, how much energy will the wheel produce in kW

Five kg of water is contained in a piston–cylinder assembly, initially at 5 bar and 500°C. The water is slowly heated at constant pressure to a final state. The heat transfer for the process is 2660 kJ and kinetic and potential energy effects are negligible. Determine the final volume, in m3, and the work for the process, in kJ. There is no final temperature information given.

Q3 An engineer in the maintenance department after presenting a Ghe5000 scheduled activities to management was given Ghe4600 to carry out the exercise. Explain what he can do in order to perform the said exercise on time?

Which of the following are problems with the current rapid prototyping technologies? a. Inability of the designer to design the part, Part shrinkage, & Inability to convert a solid part into layers b. Part accuracy, Inability to convert a solid part into layers, & Versatile materials available c. Poor machinability of the starting material, Part shrinkage, & Part accuracy d. Limited material variety, Mechanical performance of fabricated parts, & Part accuracy Short answer or a few-sentence short essay.

What fuel economy should be expected from a gasoline powered car with the following parameters: mass=1000kg, frontal area=2.0m² , c_d=0.25, c_rr0=0.01, c_rr1=0.00015, c_b=0 if it is traveling at 70mph? Assume a 30% thermodynamic efficiency.

A rigid, well-insulated tank contains a two-phase mixture consisting of 0.005 ft3 of saturated liquid water and 2.7 ft3 of saturated water vapor, initially at 14.7 lbf/in.2 A paddle wheel stirs the mixture until only saturated vapor remains in the tank. Kinetic and potential energy effects are negligible. For the water, determine the amount of energy transfer by work, in Btu.

A batter hits the baseball A with an initial velocity of v₀ = 97 ft/sec directly toward fielder B at an angle of 40° to the horizontal; the initial position of the ball is 2.0 ft above ground level. Fielder B requires 0.23 sec to judge where the ball should be caught and begins moving to that position with constant speed. Because of great experience, fielder B chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. Fielder B starts 234 ft from the batter. The catch position is the field location at which the ball altitude is 6.3 ft. Determine the velocity of the ball relative to the fielder at the instant the catch is made. Assume that the time needed for the fielder to achieve his velocity from the start point is negligibly small. Please state answer for time at catch postion as well

Select the best engine in term thermal efficiencies of an actual and reversible heat engine of two heat engine given below and give reason for your selection

Engine A:-
Source temperature 800K, heat input rate 450 kW, heat rejection rate 300 kW, sink temperature 315K

Engine B:-
Source temperature 650K, heat input rate 345 kW, pumping power 5 kW, turbine power 120 kW, sink temperature 300K.