question: What is the negative effect of `` hot spots '' forming on the filament ?
answer: a variation of diameter of only 1 % will cause a 25 % reduction in service life
turker_answer: The negative effect of `` hot spots '' forming on the filament is a variation of diameter of only 1 % will cause a 25 % reduction in service life .
rule-based: The negative effect of `` hot spots '' forming on the filament is a variation of diameter of only 1 % will cause a 25 % reduction in service life .