Engineering Answers

Write the parameters by which various AM techniques differ from one another.

State the advantages of using prototype. What is the importance of prototyping?

13. What is the purpose of the epi layer on the silicom？(   )

 a. The epi layer is used to form the gate of the transistor.

b. The epi layer provides a low defect crystal structure.

c. The epi layer has already been doped with n-type dopant to serve as the n-well.

d. The epi layer provides isolation between metal layers.

The crank OP of a crank- and slotted-lever mechanism rotates at 100 rpm in the counter-clockwise direction. Various lengths of the links are OP = 90 mm, OA = 300 mm, AR = 480 mm and RS = 330 mm. The slider moves along an axis perpendicular to AO and is 120 mm from O. Determine the velocity of the slider when the AOP is 1350 .

Determine h0 and e using the following given parameters: μ = 0.02756 Pa, N = 30 rev/s, W = 2210 N (bearing load), r = 19mm, c = 0.038 mm, and l = 38 mm. Also, determine the co-efficient of friction, the torque to overcome friction, power loss to friction, total volumetric flow rate Q, side flow rate Qs, maximum film pressure and the location of maximum and terminating pressures.

In designing a radio tower at an airport, engineers must take into account the ascent rate (slope at which a plane can take off) such that planes will not collide with the tower. If the most shallow ascent rate is found to be 9% (the plane climbs vertically 9 ft for every 100 ft of horizontal travel), and the tower is 300 ft tall, how far can the tower be safely placed from the end of the runway?

With a neat sketch explain the three phase transformer connections.

One contemporary issue related to mechanical engineering

The device parameters for an n-Channel JFET are: Maximum current iDSS = 10mA. Pinch off voltage, Vp = - 4V Calculate the drain current for (a) VGS = 0 (b) VGS - 1.0v (c) VGS = - 4V.