Eight-term member Sumitra Mahajan was on Friday unanimously elected Speaker of the 16th Lok Sabha, becoming the second woman presiding officer of the lower house after her predecessor Meira Kumar. br br 71-year-old Mahajan, the longest-serving woman MP, was elected after a motion moved by Prime Minister Narendra Modi and seconded by BJP veteran L K Advani was adopted by voice vote called by pro tem Speaker Kamal Nath.