Whoever, by personation or otherwise, shall intentionally cause, or knowingly suffer himself to be returned, empanelled, or sworn as an 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 assessment, shall be punished with imprisonment of either description for a term which may extend to two years, or with fine, or with both.