Why are the closing ranks of Thapar University going so low? Is the level of the institute degrading?

According to my brother who studied in Thapar mentioned that closing rank is not an indicator for the degradation of the institute. 

• Thapar University is considered one of the most prestigious colleges for engineering in the country. 
• It provides innumerable facilities and opportunities to all the students. 
• The ranks depend largely upon the level of the question paper designed. Previously, most of the candidates got a rank above 50,000, due to consideration of board percentages.

Last but not least we can say that closing rank does not define the college. The college continues to impart the knowledge and gives decent placement opportunities along with internship offers, which still attracts students.