Mechanical Engineering Answers

A fluid system undergoes a non flow frictionless process following the p-V relation as p=(5/V)+1.5 where p is in bar v is in m^3. During the process, the volume changes from 0.15m^3 to 0.05m^3 and the system rejects 45 kilojoule of heat.determine 1) change in internal energy 2)change in enthalpy

Draw a circuit diagram showing how a bi-directional hydraulic motor
can be driven by a unidirectional hydraulic pump with both torque
control and “meter out” speed control.
(b) Explain the operation of the circuit you have designed in part (a) above.

Two tanks are separated by a vertical rectangular wall of 7.5m wide.in one tank there is fresh water to a depth of 7.2m and in other there is oil of specific gravity 0.8 to a depth of 4.2m.Find the resultant thrust on the wall in MN and the position of resultant centre of pressure.

Explain the concept of obtaining a reflection about an arbitrary line starting from the plain reflection about an axis. How do you obtain the orthographic projections of 3D geometric data base?

Design a bushed pin type flexible coupling to connect a motor shaft to a pump shaft transmitting 20kW power at 1440 rpm. The allowable shear and crushing stress for steel shafts,keys and pins are 40MPa and 80 MPa respectively. The allowable shear iron flange is 10 MPa and the allowable bearing pressure for rubber bush is 0.5 Mpa.

A mass of gas at an initial pressure of 28 bar, and with an internal energy of 1500kJ, is contained in a well-insulated cylinder of volume 0.06m3. The gas is allowed to expand behind a piston until its internal energy is 1400kJ; the law of expansion is pv2 = constant. Calculate: a. The work done; b. The final volume; c. The final pressure (with 6 significant digits).

I have many questions I answered most of them, but there are 5 of these questions I need help on them. These questions about Advanced Engineering Dynamics.

A company produces four products in its production facility. The facility, which
has four equipments labeled A to D were arranged in alphabetical order with
position of R and S fixed as receiving and shipping point respectively (R-A-B-CD-S). The routing information, quantities, and volumes for each product are given
in the table below.

The p-type base of a crystalline silicon solar cell, 300μm wide, with an electron diffusion length of 400μm, has a perfectly passivated rear surface, with a zero surface recombination velocity. What is the probability that an electron generated near the back surface is collected at the junction ?

in a chocolate packing unit it takes a standard time of 0.01 hour to pack one carton box. the annual demand is 500000 carton boxes. assuming 1% scrap, calculate the number of men and machines required to complete the task if the packing unit is operational for 40 hours per week with 52 weeks in a year.