___ is used to support and protect electrical conductors. correct answer: Conduit
A ___ is a device that converts mechanical energy into electrical
... [Show More] energy by means of electromagnetic induction. correct answer: generator
Cogeneration produces ___ for use in a process or heating. correct answer: electricity
In a watertube boiler, the heated water inside the tubes becomes ___, causing it to rise. correct answer: less dense
Boiler tubes are manufactured using materials that meet ___ specifications. correct answer: ASTM
A condensing economizer recovers ___ Btu/lb from the heat in the water vapor. correct answer: 970
A high pressure steam boiler operates at a steam pressure over ___ psi. correct answer: 15
In electrode electric boilers, heat is generated by electric current flowing from one electrode to another electrode through the ___. correct answer: boiler water
A ___ boiler is a watertube boiler in which replaceable serpentine tubes are connected to the upper and lower drums and surround the firebox. correct answer: flex-tube
A mud drum, if used, is the lowest part of the water side of a(n) ___ boiler. correct answer: watertube
Watertube boilers were designed to operate at pressures as high as ___ psi, a point known as the critical pressure of steam. correct answer: 3206
In a firetube boiler, the heat produced by gases of combustion ___. correct answer: passes through the tubes
A disadvantage of a vertical firetube boiler is that it requires ___. correct answer: a high ceiling
Some watertube boilers are equipped with ___ to increase the heating surface and the life of the furnace refractory. correct answer: waterwalls
___ stress is stress that occurs when two forces of equal intensity act parallel to each other but in opposite directions. correct answer: Shear
Baffles are used to direct gases so that they come in close contact with the ___. correct answer: boiler heating surface
___ efficiency is the ratio of the heat absorbed by the boiler (output) to the heat available in the fuel (input). correct answer: Thermal
Water will boil and turn to steam when it reaches ___°F at atmospheric pressure at sea level. correct answer: 212 [Show Less]