barrage energy example

a) Calculate the volume of water that is available for power generation at the extremes of spring and nap tides? b) If during the time the turbines are running, the level of the water in the bay is 2m higher that that in the sea, what is the potential energy available from the scheme? c) Assuming the turbines and associated machinery have an overall efficiency of 30% and the average bulk price for electricity is 2p/kWh, what annual income is available? (we can assume that the height of the tides varies evenly between neap and spring levels) d) If investors are looking for a 15% return on capital employed, what is the maximum cost of the 17km barrage if it is to be privately financed and p... click for more

Exam sample question in Applied Mechanics

Question 1 A solid shaft 125mm dia. Transmits 600kW at 300 rev/min. It is also subjected to a bending moment of 9kN-m and to an end thrust. If the maximum principal stress is limited to 80MPa , determine the permissible end thrust. Determine also the position in which the principal stress acts and draw a diagram showing the position of the plane relative to the torque and the plane of the bending moment applied to the shaft.

Exam sample question in Applied Mechanics

In Fig. Q4, the winding drum of a lift is driven by an electric motor via a gearbox having a reduction ratio of 20:1. The direct inertia on the motor shaft is 0.05 kg m2 and that on the winding shaft is 20 kg m2. The drum, which has a diameter of 600 mm, moves a lift by means of a cable wound around it. If the lift has a mass of 500 kg, find the torque required from the motor to raise the lift with an acceleration of 2 m/s2. I have also included an attached file with the question and sketch in the next section. ... click for more

ASSIGNMENT QUESTION 3 PART 2

PLEASE NOTE THAT I ONLY REQUIRE THE ANSWER FOR PART 2 OF THE QUESTION BELOW. ALSO THAT I HAVE BEEN GIVEN AN ANSWER OF 87.8 rad/s FOR PART 2, BUT WITH NO WORKINGS OUT, WHICH I AM REQUESTING FROM YOU. HOPE YOU CAN HELP. I HAVE INCLUDED AN ATTACHMENT BELOW OF THE QUESTION, IN CASE YOU DO NOT GET THE COMPLETE QUESTION BELOW. Question 3 Fig. Q3 shows a rigid light beam which is hinged at O to a wall. The beam carries a point mass of m at the free end. The beam is connected at its mid-point to a spring (stiffness k) which is also connected to a support that moves with a vertical motion y = Y sinwt. A damper (coefficient c) connects the mid-point of the beam to a fixed support. ... click for more

Calculating a Constant Pressure process

In a constant pressure, nonflow process, 6Btus of heat are added to a gas while the volumes change from 1.6ft^3 to 2.0ft^3. If the temperature decreases by 10*F and the system contains 2 lbm of gas, find the pressure in the system. (Cv=.2Btu/lbm*F) 1Btu=778 ft-lbm