?One of the first synthetic plastics was discovered by Dr. Leo H. Baekeland as a result of the chemical reaction of phenol and ____.
A. ?formaldehyde
B. ?sulfur
C. ?manganese
D. ?selenium
Answer: A
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A. Technician A B. Technician B C. Both A and B D. Neither A nor B
Voltage detectors should be of the contact type when verifying the absence of voltage in _____.
a. switchgear b. substations c. overhead lines d. high-voltage applications
New caliper piston seals should be lubricated with:
A. clean brake fluid. B. silicone grease. C. petroleum jelly. D. either B or C.
An inherent quality of a vapor diffusion retarder is ________
A) It does not allow microscopic water molecules to pass through the wall system B) It does allow microscopic water molecules to pass through and leave the wall system. C) It blocks 100% of moisture transfer D) It speeds up the transfer of bulk moisture