1. Which of the following has the lowest specific gravity? A. Air B. Butane C. Natural Gas D. Propane 2. Which of the following fuel gases has the highest average Btu value per cubic foot of gas? A. Butane B. Hydrogen C. Natural Gas D. Propane 3. Material used for gas piping must meet all the listing specifications of A. an approved standard i.e. ASTM or ANSI B. Warnock Hershey C. ISO 16001 D. IAPMO 4. Pressure drop in some piping systems is caused by A. moisture in the piping system B. Friction from pipes and fittings C. poorly manufactured gas containing heavy metals D. too high of an inlet pressure 5. To properly size a section of gas piping using the branch length method you must always use A. the single largest Btu/h appliance for all calculations B. the total length of all piping and the single largest Btu/h appliance C. the total length of that section of piping and the total Btu/h load of that section D. the longest length of pipe and the Btu load of the section 1. What is the name of the sheet metal "box" that connects a furnace to the trunk? A. Boot B. Cross brace C. Grilie D. Plenum 2. To prevent the transmission of mechanical noise and vibration from the furnace to the ductwork, what should be used? A. Cross brace B. Metal hanger or band C. Oversized plenum D. Vibration eliminator 3. Which type of furnace has vertical airflow and the blower located above the heat exchangers? A. Downflow B. Horizontal C. Hydronic D. Upflow 4. Which type of furnace has vertical airflow and the blower located below the heat exchangers? A. Downflow B. Horizontal C. Hydronic D. Upflow 5. Which type of furnace can be configured for more than one application? A. Horizontal B. Multi-position C. Multi-sided D. Multi-use 6. A boiler that is shipped in pieces or sections and must be assembled on the jobsite is known as a A. condensing boiler B. high-efficiency boiler C. knock-down boiler D. package boiler 7. A secondary piping loop is used with high-efficiency boilers to A. allow for additional zones to be added B. prevent thermal shock and water flow problems C. protect the boiler from excessive pressures and temperatures D. reduce the number of circulator pumps needed 8. All of the following are connected at the point of no pressure change except the A. circulator pump B. expansion tank C. fill valve D. gas valve 9. When installing gas-carrying lines, the proper slope is A. X-inch per 15 feet B. X-inch per 20 feet C. y-inch per 15 feet D. Y-inch per 20 feet 10. When threading a pipe, the number of complete threads necessary is A. 1 to 2 B. 3 to 4 C. 4 to 6 D. 7 to 8
