Why is it important to make the braze on a compressor stub as quickly as possible?
What will be an ideal response?
The thin copper coating is easily damaged by overheating if the oxyacetylene torch flame is an oxidizing flame or if too much time is taken during brazing.
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Dual-check valve backflow preventer assemblies are difficult for plumbers to remove, test, or replace because they _____.
a. have left-hand threaded connections b. do not have replaceable valve inserts c. are installed in very tight spaces d. are not normally fitted with shutoff valves or test cocks
True or false? More wood is produced in U.S. forests today than in the 1600s
What will be an ideal response?
What are ten safety precautions you should take while working around electric current?
What will be an ideal response?
Power is carried to the outside circuit of a revolving armature type alternator via brushes riding against the _____.
A. commutators B. diodes C. sliprings D. wires