Purwar, the Director (Finance) of MTNL, had earlier held the additional charge between June 2014 and June 2015.
"Narendra Kumar Yadav has relinquished the charge of CMD of the company w.E.F. June 8, 2016. P K Purwar, Director (Finance), MTNL, has been entrusted with the additional charge of the post of CMD," MTNL said in a filing to the BSE.
Yadav, a Member (Services) Department of Telecom, had been given the additional charge of CMD on June 8, 2015.
Interestingly, Purwar's name had been recommended for the MTNL's top post by Public Enterprises Selection Board (PESB) in November 2013, but the government did not go ahead with the recommendation.
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MTNL, which offers telecom services in Delhi and Mumbai circles, has been making losses since 2009-10.
The PSU posted a consolidated net loss of Rs 2,012.24 crore for year ended March 31, 2016, against that of Rs 2,901.16 crore at the end of March 2015.
At the end of March 2016, the company had 3,56,085 wireless subscribers and 3,504,088 wireline users, according to Telecom Regulatory Authority of India's data.