Oil Burner License |251 Questions| With Correct Answers.

When applying current through a conductor that is wound in a coil the magnetic lines of force created are used in {Ans: -Solenoid valve -Relay -Electric motor}Which of the following does not affect draft? {Ans: Boiler design}When a boiler or furnace is oversized, off cycle heat loss ______ and efficiency decreases. {Ans: Increase}In an electric circuit in order for the wattage to remain the same if the voltage drops, the amperage must: {Ans: Increase}For every pound of fuel that is burned, how many pounds of primary air are required? {Ans: 14.4}In power vented systems, the vent cap does the following: {Ans: Minimize effect of wind}