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
Which type of GFCI receptacle offers protection only at the point of installation?
a. Unlisted b. Feed-through c. Solid-state d. Nonfeed-through
Why is it important to only strike an arc in the groove to be welded??
What will be an ideal response?
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)