Reliable Stores Corp. of Columbia, the 165-store retailer and owner of the Hub Furniture stores, has named Gregory J. Roy general manager of its 18 metropolitan Washington, Baltimore and Virginia furniture stores. Besides the 16 Hub stores, he will be responsible for the House and Hermann Furniture and National Furniture stores in Washington.

Roy was formerly a commodity specialist with the Chicago Mercantile Exchange. He joined Reliable Stores in 1970 as a sales consultant at the Hub store in Woodbridge. He most recently was store supervisor of a local seven-store group.

Roy succeeds Howard Erdrich who has been named director of corporate merchandising, northern region. Erdrich has been with Reliable for 12 years. He was named general manager of the 18 area furniture stores in 1978.

Reliable also announced the appointment of Kenneth Luchs as vice president for marketing of Reliable's 165 furniture, jewlery and waterbed stores in 15 states and Washington. Luchs was formerly director of marketing. He joined Reliable in 1963.

John Hozik has been named president and chief operating officer of E.C. Ernst Inc., the Washington electrical construction company. Hozik was formerly a partner of Arthur Young & Co. He will fill the position of president that has been vacant since shortly after the company sought protection under the Chapter XI bankruptcy law in Dec. 1978.

George S. Blanchard has been elected to the board of directors of Survival Technology Inc. Blanchard, a retired Army general after 41 years of service, is president of General Analysis Inc. in Washington.

James A. Cade and A. Key Hickman have been named vice presidents of The Volpe Construction Co. James A. Foulger was named assistant treasurer.

George M. Woodruff III has been appointed president and general manager of Frederick Electronics Corp., a Frederick-based subsidiary of Plantronics Inc. of San Jose, Calif. Woodruff was formerly vice president for operations of Anaconda Ericsson.

Edward J. Szympruch has been promoted to general manager for paving construction of Genstar Stone Products Co. of Hunt Valley.

Bill R. Stumbo has been promoted to manager for distribution of the grocery products division of McCormick & Co. Inc. Stumbo joined McCormick in 1960.

Richard E. Hopkins has been appointed vice president for sales of Phillips Corp., an Annapolis-based distributor and manufacturer of machine tools and industrial supples. Hopkins had been with Warner & Swasey, a Bendix Corp. subsidiary in Cleveland since 1955.

John E. Shuey has retired as president of Applied Food Systems Corp., a Columbia-based distributor of foodservice equipment. Michael W. Johns, former company vice president, has succeeded Shuey.

Robert F. Ellsworth has been elected chairman of the board of Howmet Turbine Components Corp. of Greenwich, Conn. Ellsworth is chairman and president of Robert Ellsworth & Co., a Washington private investment firm. Ellsworth was U.S. ambassador to NATO from 1969 to 1971.

Kim A. Terry has been named sales representative for Washington and Maryland of Seagram Distillers Co. of N.Y.