Mehta was seen entering the SFIO office here before 11 AM and leaving around 4 PM, presumably after recording his statement.
The New Delhi-based PNB is the third lender which has been called by SFIO in the last two days in connection with the nearly USD 2 billion fraud.
Axis Bank and ICICI Bank officials had appeared before SFIO yesterday to record their statement in the case, as well.
The CBI officials had said the examination was focused on understanding how the crime was detected by the bank, procedural issues and their violations.
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They said that Mehta and Rao were not being treated as accused in the case.
The SFIO, which is the investigating arm of the ministry of corporate affairs, is expected to call officials of nearly 31 banks that have an exposure to companies of Modi and Choksi.
Officials of all the banks that have given loans to companies of Modi and Choksi in the last one or two years are likely to be summoned first by the SFIO for recording their statement in connection with the scam, said a banker.
The transactions were carried out by Modi by allegedly acquiring fraudulent letters of undertaking (LoU) from the lender's Brady House branch in Mumbai to secure overseas credit from other Indian lenders.
The CBI has so far arrested over a dozen people, including former and current officials of PNB and companies related to Modi and Choksi, in connection with the case.