WASHINGTON — House Republicans on Wednesday peppered Janet L. Yellen, the Federal Reserve chairwoman, with pointed questions about the central bank’s stimulus campaign and its responsibilities as a financial regulator.

Republicans, who control Congress but not the agencies that interpret and execute legislation, appear frustrated with the course of economic policy. They want the Fed to retreat more quickly from its stimulus campaign and to ease some of the restrictions that a Democrat-controlled Congress imposed on the financial industry after its 2008 collapse.  Read more