What type of system provides even heat in a residence by circulating hot water to radiators, finned tubes, or convectors?
A. wall-mounted
B. hydronic
C. baseboard
D. zone-control
Answer: B
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Footlights in a stage that are designed to disappear into a storage recess when not in use must be designed so that _____.
a. their external temperature cannot exceed 125°F (51.6°C) b. the power supply is automatically disconnected when the lights are retracted c. no flammable materials are within 12 inches (30.5 cm) d. their wattage is automatically reduced when the lights are retracted
Where does cavitation erosion normally occur on a wet liner?
A. fore and aft B. aligned with the piston thrust faces C. under the upper flange D. below the lower O-rings
Both ratified in the 1930s, the Twentieth Amendment ____ and the Twenty-first Amendment ____.
A. shortened the time between the presidential election and inauguration; ended Prohibition B. limited a president to two complete terms in office; repealed the Eighteenth Amendment C. rendered most New Deal programs unconstitutional; limited a president to two complete terms in office D. ended prohibition; shortened the time between presidential election and inauguration E. expanded the size of the Supreme Court; ended Prohibition
The boiler system component that monitors water temperature and possibly controls water circulation is the
_____ A) water level control B) zone control C) makeup water valve D) aquastat