An Alexandria man pleaded guilty in federal court here yesterday to making an illegal attempt to obtain a GS-16 job at the Federal Trade Commission by falsely claiming to have a doctorate in computer science, three master's degrees and a bachelor's defree.

H. Douglas Bankhead, 35 of 8914 Bridgehaven Ct., actually had only one degree - a master's that he earned at the University of Colorado - but even that degree was based on the phony claim that he already had a bachelor's degree, according to investigators.

Assistant U.S. Attorney Raymond Banoun of the fraud division said Bankhead, a former St. Louis detective who had one leg amputated as a result of wounds received in the Vietnam was, also had been employed by the Martin Marietta Corporation and General Electric on the basis of his false degree claims.

Bankhead's phony claims were discovered when an FTC employee became suspicious after Bankhead had been interviewed there for the job of assistant executive director of management, investigators said. Normally, the FTC does not make detailed background checks on prospective employees, Banoun said in court.

Bankhead entered his plea before U.S. Magistrate Jean F. Dwyer. He could be sentenced to a maximum of one year in jail, fined $1,000, or both on his plea to a charge of attempted false pretenses.