Engine_2014 : Steam Plants - 63/1951
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| A photoelectric cell is installed in an oil fired boiler safeguard system to introduce proper resistance values to the electronic control circuit. This device is primarily sensitive to __________. |
| A) light emitted from the back wall incandescent brickwork |
| B) light emitted from the front wall incandescent brickwork |
| C) the orange portion of the flame spectrum |
| D) the blue portion of the flame spectrum |
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