How are water pumps in hydronic heating systems checked?
What will be an ideal response?
By measuring the waterflow in the system. Either using a flowmeter built into the system or by measuring the pressure drop across the water pump and comparing it to a pumping performance chart.
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List three characteristics of fluids used in heat exchange pumps.
What will be an ideal response?
____ is the most commonly used semiconductor material.
A. Silicon B. Germanium C. Carbon D. Indium
Answer the following statement(s) true (T) or false (F)
1. An implied datum is an assumed plane, axis, or point from which a dimensional measurement is made. 2. When dimensioning the location of a feature of size on a part, implied datums should be used. 3. A datum is the origin for dimensional measurements. 4. The datum feature symbol should be specified to be read from the top of a drawing. 5. Where a datum feature symbol or a datum reference frame symbol is repeated on a drawing, it is not necessary to designate them as reference.
When ductwork fittings are fafricated, there is more waste with fittings than straignt duct.
Answer the following statement true (T) or false (F)