There are also further divisions in the Science stream, namely Medical and Non-Medical. Subjects you study in CBSE Class 11 will differ based on your chosen stream. You can also opt for Economics, Mathematics, and Marketing as electives if you want to pursue economics-related graduate programs. If you wish to pursue a career in Writing, Filmmaking, Psychology, or Journalism, Arts must be your stream of choice. Commerce students can also choose subjects from the Arts stream, but not from the Science stream. It is a popular choice for candidates who aspire to have a career in Accounting, Investment Banking, Finance, and Entrepreneurship.

If you choose Commerce in Class 11, you are up for a glorious career in the Financial and Commercial sector. PCMB (Physics, Chemistry, Maths, and Biology) is also an option if you are unsure about your career path or wish to pursue a career in the Bioengineering or Biomedical field. On the other hand, you should choose PCM (Physics, Chemistry, Maths) for a career in a Technical or Engineering field. If you want to study medicine, opt for PCB (Physics, Chemistry, and Biology). Learners interested in pursuing a career in Engineering, Medical or Architecture need to choose the Science stream. Learners have to choose between three streams - Arts, Science, and Commerce. In contrast to Class 10, where every subject is taught in a generalised manner, in Class 11, you have to select a stream of your choice. It is also a critical year to start your preparation for entrance exams. The Central Board of Secondary Education (CBSE) conducts term exams for Class 11 every year in September and March. As soon as the engine doesn't need to suck, and air is forced into the inlet - you have reached the ram recovery point.CBSE Class 11 is an essential year for Learners as it sets the foundation for all the important topics to be covered in Class 12, the last class before you complete your schooling. In an idle engine run on the ground, the engine has to suck in air.

You reach the ram recovery point as soon as the inlet pressure (ram pressure) is greater than the ambient pressure. (From the Dale Crane part 66 Powerplant book). Here is a graph showing the result of ram recovery speed, and the point where the forces are equal. Though you could see the ram recovery point as the moment the airspeed effect on thrust and and the ram effect on thrust are equal. I had a chat about this with my turbine engine teacher, which changed my understanding on the subject. This happens because you push the air molecules together. Ram pressure increases when you fly into the air molecules fast. In class, we haven't talked about it as a specific recovery point.īut as a gradual increase in thrust based on airspeed.Īirspeed thrust decreases as the altitude increases. As density increases, and if we assume constant RPM (and thus volume) the mass of the air flowing through the engine increases.Īt some point the increased mass flow $Q$ has compensated the loss of velocity change in the engine and thrust has reached its stationary engine value. That means that the density of air in the inlet increases. The thrust ( $T$) of an engine is $T = Q(V_$ increases, the net result is that engine begins to lose thrust.īut as the speed increases past about Mach 0.2, which equals approximately 130kts at sea level at standard day conditions, the air being packed (rammed) in the engine inlet begins to compress due to increasing pressure.

Ram pressure classes