The hardness of a cutting tool increases with increasing temperature. Thus, it is always convenient to machine at higher speeds that lead to higher temperatures.
i. True. ii. False. iii. The statement is true or false depending on other conditions. iv. Not sure. I will take the penalty .

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.