Example for strengthening mechanism in single-phase material a. dispersion strengthening b. precipitation hardening c. fiber strengthening d. strain hardening

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.