Instrumentation Engineering is a branch which is offered in most of the top IITs and NITs, the premier among them being IISc, IIT-Mumbai, IIT-Madras, IIT-Delhi and IIT Kharagpur.
Students pursuing B.Tech or B. E. in Instrumentation Engineering can answer the GATE Instrumentation Engineering paper. The test covers 6-7 major subjects: Analog and Digital Instrumentation, Sensors, Control Systems, Signals and Systems, Network Theory, Communication and Optical Instrumentation, etc. It also tests students on Engineering Mathematics and General Aptitude.
Students who qualify in the GATE exam can apply to these colleges. GATE score is also valid for quite a few companies like ONGC, BSNL, GAIL, etc. Even private companies like L&T give preference to GATE qualified students.