Bernanke to speak on economy to Congress on May 22 WASHINGTON (Reuters) - Federal Reserve Chairman Ben Bernanke will deliver testimony on May 22 on the outlook for the U.S. economy before the Joint Economic Committee of Congress, according to an announcement on the website of committee chairwoman Amy Klobuchar. Bernanke's appearance will come as markets, weighing recent mixed indications on the strength of the U.S. economy, focus on the likely duration of continued bond purchases by the U.S. central bank to spur growth and hiring. Reporting By Alister Bull