A thermistor is a solid-state variable resistor made from a semiconductor material that changes resistance in relation to:
A. Pressure changes.
B. Temperature changes.
C. Volume changes.
D. Voltage changes.
Answer: B
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Which of the following square junction boxes must be used if there is one 6" conduit and two 4" conduits entering on one side of the box and exiting at a 90° angle on another side of the box? (Assume the conductor size is No. 4 AWG or larger, but operating at less than 1,000V.)
a. 24" b. 30" c. 36" d. 4
When the insulation requirements call for a greater depth of loose-fill insulation than the height of the ceiling
joists in an attic will allow, you can provide containment for the loose-fill insulation by _____. a. using soffit baffles to hold the excess insulation in place b. tamping down the insulation and holding it in place with plywood sheathing nailed to the ceiling joists c. laying plastic sheeting over the loose-fill insulation to hold it in place d. installing strike-off boards over the joists
Ductility is the ability of a material to return to its original form after removal of the load.
Answer the following statement true (T) or false (F)
Medicine used to treat common cold:
a. Often makes you sleepy and should not be used while driving. b. May still be used while driving if you use half of a regular dose. c. Should only be used when driving at daytime.