单选题 1分

Excessive return oil pressure from a variable capacity return flow fuel oil burner system on an auto...

Excessive return oil pressure from a variable capacity return flow fuel oil burner system on an automatic auxiliary boiler, will cause _______.
  • A. flame failure
  • B. burner smoking
  • C. ignition failure
  • D. burner failure

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1 单选题 1分
  • A. fuel pump failure
  • B. fan motor failure
  • C. increased feedwater consumption
  • D. decreased boiler efficiency
2 单选题 1分
  • A. white incandescent flame
  • B. high flame temperature
  • C. black stack smoke emission
  • D. 0% carbon monoxide level
3 单选题 1分
  • A. low water level
  • B. excessively high pressure
  • C. high water level
  • D. low oil temperature
4 单选题 1分
  • A. low water level
  • B. excessively high fuel pressure
  • C. low oil pressure
  • D. an improper air/fuel ratio