The solder most commonly used on low-pressure copper fittings is made from _____.
a. 100% lead
b. 50% tin/50% silver
c. 95% tin/5% antimony
d. 45% silver/25% zinc/30% copper
c. 95% tin/5% antimony
Trades & Technology
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What are seven types of irrigation systems commonly used in greenhouses?
What will be an ideal response?
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List the two general classifications of animal parasites
What will be an ideal response?
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Often the number of sparks in the air increases just before a ____ takes place.
A. backfire B. weld crater cracking C. burn-through D. flashback
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If the diode in a half-wave rectifier opens, ________
A) the output voltage would be zero B) the output voltage would not change C) the output voltage would equal the transformer secondary voltage D) the output ripple would be very small
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