ELECTRICAL ENGINEERING MY POWER 4B3 MULTIPLE CHOICE QUESTIONS AND ANSWERS .

ELECTRICAL ENGINEERING MY POWER 4B3 MULTIPLE CHOICE QUESTIONS AND
ANSWERS .
At the end of the pre-purge period, the programming control:
Select one:
a. Opens the main fuel valve
b. Closes the pilot valve
c. Ends the ignition trial
d. Energizes the ignition transformer
Answer -d. Energizes the ignition transformer
A steam boiler is regularly blown off in order to:
Select one:
a. Clean the soot and carbon out of the firebox and tubes
b. Lower the operating water level in the boiler
c. Discharge sediment from the boiler
d. Test the relieving capacity of the safety valves fitted to the boiler
Answer -c. Discharge sediment from the boiler
A flame failure device is unresponsive to:
Select one:
a. Ultraviolet light
b. Infra-red light
c. Visible light