What controls the firing of a water boiler?
A) The auxiliary switch on the zone valve
B) A wall thermostat that senses the temperature of the house
C) The boiler water temperature is normally maintained by the high limit and the low water cutout.
D) An aquastat that senses the temperature of the water in the boiler
D
You might also like to view...
The actual mortar joint size can be determined from the _____ coursing information and the specified unit size.
A. horizontal B. vertical C. combined horizontal and vertical D. either horizontal or vertical
The reliability of power from the national electrical grid is presently _____
A) 98.2 percent B) 86.8 percent C) 99.9 percent D) 72.4 percent
A(n) ____ is the process of accounting for all personnel-that is, determining each individual's whereabouts-during an emergency.
A. personnel count B. employee count C. head count D. team leader count
A ________ table illustrates the relationship between a logic circuit's output and every possible combination of inputs
Fill in the blank(s) with correct word