Ashworth Lesson 2: Careers for mechanics and technicians exam

Which substance (s) have no fixed shape and no fixed volume?

consider a packed bed of 10cm diameter concrte (stone mix) spheres to be used as a thermal (energy) storage sysytem initailly the speheres are 15 deg C; airat 50deg C flows around each sphere providing a convection coefficeint of 10Wm^-2k^-1.

Silicon is the most widely used semiconductor material for integrated circuits. Which of the following are less common semiconductor materials used for ICs (two best answers) : (a) boron, (b) boron nitride, (c) gallium arsenide, (d) germanium, (e)

In the layout of a printed circuit board for an electronic product, 12 different locations can accommodate chips.

What is the inch equivalent of 1 millimeter

Consider the following grooves, each of width W, that have been machined from a solid block of material. (a) For each case obtain an expression for the view factor of the groove with respect to the surroundings outside the groove.

What is the last step to the design process? A: Define the problem B: Present solution C: Evaluate a solution D: Develop a solution

The controller can be considered the brain of closed loop system

What is the main role of matrix in composites! a) - to transfer stress to the other phases b) - to protect phases from environment c) - to reduce the hardness d) - to enhance ductility

Our goal is to design a traffic-light controller with the following properties; it lights up the green light (output G) for 15 seconds, followed by the yellow light (output Y) for 9 seconds, then the red light (output R) for 12 seconds.