How is the water flow in a hydronic heating system checked?
A) By measuring the pressure drop across the water pump and comparing it to a pumping performance chart
B) By measuring the pump motor RPM using a digital tachometer
C) By measuring the amp draw of the pump motor and applying the formula gp = amps × 1.73
D) By measuring the impeller RPM using a stroboscope
A
You might also like to view...
A(n) ____ is designed to operate in reverse bias at the breakdown region.
A. Xenon diode B. Zener diode C. reverse diode D. inverse diode
Overall ROR = [30,000(0.20) + 70,000(0.14)]/100,000 = 0.158 (15.8%)
What will be an ideal response?
The smaller of two (or more) ____ loads can be omitted, as long as they are never energized simultaneously.
A. noncoincident B. nonsingular C. incidental D. compressor
Like coaxial lines, waveguides are perfectly shielded, which allows for no _____________
A. radiation loss B. power loss C. energy loss D. noise