The D.C. City Council gave preliminary approval yesterday to two candidates Mayor Marion Barry had nominated for the D.C. Lottery Board, boosting Barry's efforts to gain more control over Washington's legalized gambling operations.

The nominees are to replace board members Lillian C. Wiggins and Jerry S. Cooper who, with board Chairman Brant Coopersmith, have formed a 3-to-2 majority that often has been at odds with Barry, particularly in awarding major lottery contracts. Wiggins' and Cooper's terms expired in June, but they continued to serve, pending council confirmation of their replacements.

The council, meeting as the committee of the whole, approved with virtually no discussion the nominations of John W. Posey, director of the University of the District of Columbia's Center for Student Financial Assistance, and Alice Tompkins Davis, acting executive director of the Howard University Medical Alumni Office.

Final action on their nominations is scheduled for next Tuesday's council meeting. If they are approved, Posey and Davis are expected to be sworn in and begin their duties a short time later, a Barry aide said.

The quasi-independent lottery board has been criticized by Barry and members of the council over, among other things, the size of the board's professional staff and the administrative cost of running the lottery.

Council member Nadine P. Winter (D-Ward 6), who oversees the board, has introduced legislation that would bring its day-to-day operations more directly under the control of the mayor and the council.

The bill would expand the five-member board to seven members, but make it an advisory body.

Under Winter's proposal, primary reponsibility for daily operations would be given to a salaried executive director who would be appointed by the mayor and would report directly to him. Cooper and Coopersmith both have argued against Winter's proposal, saying that it would undermine the board's ability to operate the lottery games as a business.

In other action:

* The council gave preliminary approval to a proposal that would give about 365 nonunion employes at the University of the District of Columbia a 6 percent pay raise. The proposal, which primarily affects administrators, would give them the same rate of increase as union employes, and money for the boost already has been included in the university's budget for the coming year, according to UDC spokesman John H. Britton.

* The council was briefed by planning officials on the city's proposed comprehensive land-use plan, which will help to shape city policies for the next 20 years. The council will hold a series of public hearings on the plan next month.