All of the following would immediately rule out the reuse of a valve EXCEPT ____.
A. bent stem
B. burned face
C. excessive carbon deposits
D. non-visible margin
Answer: C
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What should be used to check for leaks on acetylene hose fittings?
A. a Zippo B. a striker C. a neutral flame D. soapy water
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The ____ test is used to ascertain the resistance to wear of hardened concrete samples.
A. freeze-thaw B. curring C. abrasion D. compressive strength
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Which of these substances is used to pickle food?
a. fish oil c. sugar b. salt d. vinegar
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For a tank circuit to maintain oscillation, ____ feedback is required.
A. degenerative B. regenerative C. positive D. negative
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