http://www.questionpapers.net.in/Question%20Papers/gate-question-papers-download/gate-question-papers-download-chemical-engineering-2009.pdf
http://www.questionpapers.net.in/Question%20Papers/gate-question-papers-download/gate-question-papers-chemical-engineering-2008.pdf
http://www.questionpapers.net.in/Question%20Papers/gate-question-papers-download/gate-question-papers-chemical-engineering-2007.pdf
http://www.questionpapers.net.in/Question%20Papers/gate-question-papers-download/gate-question-papers-chemical-engineering-2008.pdf
http://www.questionpapers.net.in/Question%20Papers/gate-question-papers-download/gate-question-papers-chemical-engineering-2007.pdf