What controls the firing of a water boiler?
A) The auxiliary switch on the zone valve
B) An aquastat that senses the temperature of the water in the boiler
C) The boiler water temperature is normally maintained by the high limit and the low water cutout.
D) A wall thermostat that senses the temperature of the house
B
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Opening a drain or blowdown valve on an operating boiler can result in _____.
a. boiler damage b. flash steam c. a rise in boiler operating pressure d. valve failure
How can dog legs be avoided when making offset bends?
a. By making the two kicks perfectly parallel b. By making sure all bends are 90 degrees c. By making sure all bends are 6" from the previous bend d. By rebending everything for accuracy
A rectangular field is 30 chains by 21 chains. How many hectares are in the field? (Note: 10 sq ch = 1 acre and 1ha = 2.5 acres.)
What will be an ideal response?
On an unmodified engine, intake manifold vacuum above 15" can indicate a mechanical problem.
Answer the following statement true (T) or false (F)