Engine_2014 : Electricity - 1464/2299
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| What is indicated by gradual blackening at the ends of component "4" shown in figures "B" and "C" of the illustration? |
| A) The unit is in danger of exploding. |
| B) The tube is nearing the end of its useful life. |
| C) The circuit voltage is too high. |
| D) The circuit current is too high. |
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Illustration EL-0081
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