Whoever, by personation or otherwise, shall intentionally cause, or knowingly suffer himself to be returned, empanelled or sworn as a juryman or assessor in any case in which he knows that he is not entitled by law to be so returned, empanelled or sworn or knowing himself to have been so returned, empanelled or sworn contrary to law, shall voluntarily serve on such jury or as such assessor, shall be punished with imprisonment of either description for a term which may extend to two years, or with fine, or with both.