As you asking for the GATE Exam Answer key of the Electronic And Communication Engineering For Getting the Answer key you may go to the official site of the GATE

the page may look as follow :



There at the Mid of the page you may Find the Link to go to the GATE Online Application Processing System After clicking on that link you may redirect to the page by Entering your Email ID and password you may log into the Application System portal and you may get your Answer key of the GATE Examination

For your convince here I am giving you the Snapshot of that page