____ diagrams show components in their electrical sequence without regard for physical location.
A. Wiring
B. Schematic
C. Control
D. One line
Answer: B
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The black rat's body is significantly longer than its tail
Indicate whether the statement is true or false
Which of the following factors was largely responsible for the fact that the entire U.S
economy did not mirror declines in the manufacturing sector during the 1970s?
a. Automation of factories b. Growth of the service sector c. Improved foreign trade balances d. Reduction of long-term interest rates e. Low levels of unemployment
What would the mixed air temperature be for a system with 30 percent outdoor air if the outdoor temperature is 20°F and the return air temperature is 70°F?
A) (20°F + 70°F)/2 =45°F mixed air temperature B) 0.3 × 20°F = 6°F; 0.7 × 70°F = 49°F; 6°F + 49°F = 55°F mixed air temperature C) 0.3 × 20°F = 6°F; 6°F + 70°F = 76°F mixed air temperature D) Mixed air temperature cannot be calculated with the information given.
Which of these can be used as a switching relay?
A) Heavy-duty relay B) Motor starter C) Contactor D) Light-duty relay