Mechanical Engineering Answers

An Educational Institute requires a library management system and has contacted your firm. You have 25 programmers, out of which 18 are busy with other projects for the time being. The Institute intends to acquire library books and other equipment, which they want to interface with the computer system. The annual evaluation of the Institute is due soon, in which computerization initiatives are appreciated. (i) Create the process model that you think will be most appropriate for the following situation. Also, list your reasons for choosing the process model and any assumptions that you make. (ii) Assess three reasons not to choose Spiral Model (iii) Outline three reasons not to choose RAD Model

A 39 kW delta-connected motor with a lagging power factor of 0,85 is supplied by a three­phase star-connected alternator having a line output of 380 V at 50 Hz. The motor has an efficiency of 78 %. Calculate the phase currents for the load and the alternator. Determine the new line current of the motor, if the supply frequency is changed to 60 Hz