How is the water flow in a hydronic heating system checked?
A) By measuring the impeller RPM using a stroboscope
B) By measuring the pressure drop across the water pump and comparing it to a pumping performance chart
C) By measuring the amp draw of the pump motor and applying the formula gp = amps × 1.73
D) By measuring the pump motor RPM using a digital tachometer
B
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What is 115% of 17?
A. 19.55 B. 20.88 C. 21.72 D. 22.34
The OS&Y stem is used mostly for _____ service.
a. corrosive b. slurry c. steam d. potable water
Which of the following statements is LEAST-Likely true?
A. Computers in North American vehicles use power side switching with current limiting devices. B. Today's transmissions ground their switches through the computer in response to various inputs. C. Transmission failures are sometimes caused by someone adding trailer brakes. D. Speed sensors are usually permanent magnet generators that can be tested with a digital multimeter using its alternating current (AC) voltage scale.
Newton's first law of motion states that a body in motion wants to remain at rest and a body at rest wants to stay in motion.
Answer the following statement true (T) or false (F)