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The angle selected for oil spray will depend on which of the following:
Both options are correct
OSHA standards prohibit worker exposure to Carbon monoxide not more than _____ PPM air averaged during an 8 hour period:
50
Joint compound in gas piping is applied sparingly to the ______ threads only
Male
The optimum excess air required for the complete combustion of natural gas fuel burners will be approximately:
5% to 10%
Which of the following gas is the main constituent in Natural gas:
Methane
Nozzles are rated in ________:
gallon per hour
In ________ the cooler air is drawn at the base of the furnace, and the warm air exits out the top of the furnace:
Up flow furnace
When there is an increase in the primary air, which of the following is not correct:
Increase in efficiency
Efficiency of the boiler is inversely proportional to the number of passes:
False
In the air stream leaving direct gas-fired units, concentrations of Carbon monoxide as per ANSI shall not be more than _______
5 PPM
Heat pumps with the highest SEERs and HSPFs invariably use variable or two-speed ______ compressors:
scroll
Convective heating should be used in draughty rooms, rooms with high ceilings or areas with open stairwells:
Hydronic heating systems use ______ to move heat from where it is produced to where it is needed:
hot water
These older natural gas systems usually have seasonal efficiencies of about ______ :
60%
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