The EGR system routes a number of the exhaust gases (6 ? 10%) from the EGR valve, last on the Intake System, and ultimately within the combustion chamber. The exhaust gases are inert i.e. they cannot burn in the combustion chamber; also, the exhaust gases take up a number of the space which would preferably be taken with the intake air. This reduces the volume of intake air readily available for the combustion process during each Power Stroke; which in turn decreases the peak combustion temperatures. This brings about lower NOx emissions. Cognitive distortions are defined being as the errors or misconceptions of the mental capability that might dominantly lead to mood disorders and anxiety attacks. They are also regarded as a fashion of thinking that have side effects for the patients which will make them separated themselves from today's world and also the reality. There are various cognitive distortions that cognitive therapists and specialists are actually in a position to identify among Obsessive Compulsive patients. It is very challenging and challenging to assess and identify cognitive distortions among patients. These distortions seen on patients are generally part of psychological therapies for Obsessive Compulsive Disorder.