Ahollow steel shaft is to transmit 4200n-mof torque and is to be sized so that the torsional stress does not exceed 120mpa . if the inside diameter is 70 per sent of the out side diameter what size shaft should be used .use preferd size . what is stress of the inside of the shaft when full torque is applied

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

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.

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.