A catalytic zero-order reaction is conducted using a catalyst with a flat-plate geometry. a. Write the governing material balance equations to describe the processes occurring within the pellet. b. What is the maximum value of Thiele modulus ( max, =1) for the internal effectiveness factor to be 1? Obtain the concentration profile of the reactant as a function of position for  <  max, =1.

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?

A)-explain briefly the importance of standards in engineering design. b)- what is patent? c)-explain the relationship between these standards: b.s. and b.s.en d)- in engineering design concepts, types of loads and how they act are important factors. explain.