Explain why suspended ceilings (sometimes referred to as drop ceilings or false ceilings) are common in most contemporary commercial buildings.

What will be an ideal response?


Primarily to conceal a complex arrangement of several utilities (such as electrical and communication lines, sprinkler, water supply and sewage pipes, and HVAC ducts) that are suspended from the structural floor (or roof) above.

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A motor overload relay consists of a current-sensing unit and a mechanism activated by the sensing unit that _____.

a. dissipates excess current b. opens the motor circuit c. trips an alarm d. decreases motor speed

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Which type of GFCI receptacle offers protection only at the point of installation?

a. Unlisted b. Feed-through c. Solid-state d. Nonfeed-through

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Why is it important to only strike an arc in the groove to be welded??

What will be an ideal response?

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Gears are used to transfer torque from one gear to another, so that speed and torque are affected inversely and proportionately. 

Answer the following statement true (T) or false (F)

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