How are water pumps in hydronic heating systems checked?
A) By measuring the water flow in the system
B) By measuring the pump motor RPM using a digital tachometer
C) By measuring the impeller RPM using a stroboscope
D) By measuring the temperature of the pump motor
A
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Indicate whether the statement is true or false
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One of the joints used with a plug and slot weld is a _____
a. butt b. groove c. lap d. V-groove