Hi, This branch of engineering is one of the old and 'in demand' branch. Therefore the demand and scope both is vast. Mechanical engineers have to deal with concepts like mechanics, robotics, kinematics, fluid mechanics and more. Also it is involved in development of engines, power plant equipments, heating and cooling etc.
Therefore the scope is good and wide options are available. An average package can vary from 15-20K per month in the beginning. Good Luck.