Explain why air must be supplied to the cylinders of a two-stroke engine at a pressure above atmospheric and why such higher pressure air is not essential for the operation of a four- stroke engine.

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.

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

The air in an automobile tire with a volume of 0.015 m3 is at 32°c and 140 kpa gage. determine the amount of air that must be added to raise the pressure to the recommended value of 206 kpa gage. assume the atmospheric pressure to be 128 kpa and the temperature and the volume to remain constant.[r-0.287 kj/kgk]