Which relay terminal is the normally closed (NC) terminal?
A) 87a B) 85 C) 87 D) 30
A
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Motors operate based on the principle of ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is important when lifting a heavy object?
A. Keep weight close to body. B. Use your leg muscles. C. Keep your back straight. D. All of the above
Why do some gas furnaces NOT require an electrical power supply?
A) They are ignited and extinguished manually with no thermostatic control. B) No gas furnaces require electricity; they operate on gas. C) The gas valve is operated with the voltage generated by the thermopile safety. D) Once lighted, they never shut off.
Which of the following are composed of a continuous core of rigid foam insulation laminated between two layers of structural board with an adhesive to form a single solid pane?
A. structural insulated panels B. oriented strand boards C. expanded polystyrene boards D. steel studs