How are dry transformers cooled and what are they used for?
What will be an ideal response?
Dry transformers are used extensively for indoor installations. These transformers are cooled by air and are not encased in heavy tanks such as those required for liquid-filled transformers. Dry transformers are used for bell-ringing circuits, current and potential transformers, welding transformers, and almost all transformers used on portable or small industrial equipment, or on separately derived systems within a facility.
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____ is required for many energy-transfer reactions and for the synthesis of some lipids and proteins.
A. Calcium B. Copper C. Phosphorus D. Zinc
Each cell of an automobile 12 volt battery can produce about ________ volts
A) 4 B) 4.2 C) 1.2 D) 2.1
Name three chemicals that frequently cause chemical burns in the workplace
What will be an ideal response?
How can a technician determine a major component failure on a mid-efficiency furnace?
A) The technician must examine each component to ensure it is operating properly. B) The unit owner must accurately describe how the unit is operating to diagnose component failure. C) The technician can use the self-testing feature on the control box. D) The technician can send the control box in to the manufacturer.