The answer keys for GATE 2017 have been released recently. Candidates can check it out on GATE official website.

The answer keys for GATE 2017 have been released by the Indian Institute of Technology (IIT) Roorkee, which is the organising body of GATE.
As per the circular, the question papers along with their respective answer keys for all GATE 2017 papers are given in the official website.
The exam was conducted this year during forenoon and afternoon sessions on weekends (Saturday and Sunday) on February 4 to February 5, and February 11 and February 12.
Those who have objections in the answer keys can do it between March 3 and March 6, 2017
No correspondence or telephone calls on this matter will be allowed.
For candidates who have appeared in GATE 2017 from outside India, the fee for each answer key challenge is US$10
The Graduate Aptitude Test in Engineering (GATE) is an all-India entrance examination that primarily tests the comprehensive understanding if the candidate in various UG subjects in engineering/technology/architecture and PG subjects in science. The Indian Institute of Science (IISc) and seven Indian Institutes of Technology (IITs) are jointly conducting the GATE every year. It is the qualifying entrance examination, which is conducted for admission to postgraduate (PG) courses (M.E, M.TechPhD.D) in IISc and IITs. The operations related to GATE is each of the 8 zones are managed by a zonal GATE office at the IITs or IISc.