Ladder diagrams show a system's sequence of operation:
A) By showing the loads and switches in each circuit.
B) By showing each physical wire on the unit.
C) From left to right. Actions on the left occur before actions on the right.
D) By the order of the circuits. The circuit at the top of the diagram is energized first, and the circuit at the bottom is energized last.
A
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Using the equation: friction loss/100 feet = permissible head ÷ equivalent length of pipe x 100, what is the friction loss per 100 feet of pipe with a permissible head pressure of 11.7 and an equivalent length of pipe of 305 feet?
a. 26.06 b. 8.35 c. 100 d. 3.83
External master cylinder leaks result from leaking seals on the _________ piston.
Fill in the blank(s) with the appropriate word(s).
?An intermolecular interaction in which molecules or portions of molecules exhibit polarity is known as a(n) ____.
A. ?Van der Waals force B. ?dipole interaction C. ?hydrogen bond D. ?ionic bond
An air conditioner is operating with low system pressures, an evaporator saturation temperature of 20°F, and a suction line temperature of 24°F. The suction line is frosting. The most likely cause of these symptoms is:
A) The system is overcharged. B) Reduced airflow across the evaporator. C) Excessive humidity in the air, causing the coil to frost up. D) The system is undercharged.