Aballoon filled with helium at 20°c, 1 bar and a volume of 0.5 m3 is moving with a velocity of 15 m/s at an elevation of 0.5 km relative to an exergy reference environment for which to-20°c, po 1 bar. using the ideal gas model. determine the specific exergy of the helium, in kj

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

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

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.