What electrical principle is used to make a truck exhaust system pyrometer function?
A. piezoelectric
B. thermoelectric
C. galvanic
D. photoelectric
Answer: B
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This symbol represents
A) Compressor with internal overload. B) 3 phase motor. C) Transformer. D) Single phase motor.
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The operating sequence to light the main burners on an intermittent pilot system is:
A) The pilot valve and main valve are energized simultaneously. B) The main valve is energized, than the spark igniter, and finally the pilot valve. C) The pilot valve and spark igniter are energized, the pilot flame is proved, and then the main gas valve is energized. D) The main valve and spark igniter are energized, the pilot flame is proved, and then the pilot gas valve is energized.