Each gallon of water heated from 83°F to 117°F gains 272 Btu of heat.
Answer the following statement true (T) or false (F)
True
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The speed of a single-phase motor is determined by the number of stator windings and the _____.
a. number of rotor windings b. size of the armature c. frequency of the applied voltage d. volume of current applied
When working around machinery, it is important to keep a personal distance as well as a safe distance with _______________.
A. tools B. materials C. a and b D. none of the above
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
Vacuum is measured in which increments?
A. Inches of Hg B. psig C. psia D. cfm