Engine 2014: Motor Plants and Auxiliary Boilers

1. A An oil control valve in the fuel return line controls the combustion rate.
2. B The burner is cycled 'on' and 'off' in response to boiler pressure.
3. C The ignition electrode is fired from a step up transformer.
4. D The triple nozzle assembly responds to a low steam pressure signal from a pyrostat.

Tip: press A-D to answer