About 50 Moslem demonstrators, jeering at D.C. police and holding placards reading, "Police get out of our mosque," staged a second day of protests yesterday at the Islamic Center, 2551 Massachusetts Avenue NW.

Three people were arrested and two were injured in Saturday's protest, which was set off when a group of private security officers hired by the trustees of the Islamic Center evicted a Moslem leader living in the center and then closed it.

Iman Mohammad Asi, who told reporters that he had been living in the mosque for a year, was ousted in accordance with a 1981 D.C. Superior Court injunction forbidding anyone from living there, a spokesman for the mosque's trustees said.

The incident grew out of a prolonged struggle between the trustees, who are the ambassadors of the Moslem countries, and a group of Moslems who took effective control of the facility without permission of the trustees.

Demonstrators, who during the first day of protests hurled stones at police and tried to cross police lines, refrained from such tactics yesterday. There were no new arrests, police reported yesterday afternoon.

Several demonstrators said that they plannned to continue the protest until they gain control of the mosque.