Oil Burners State Test Already Passed

what should be the reading of a good cad cell in the light and in the dark {Ans: in the dark 20000 ohms or more in the light 1000 ohms or less}what are three causes of delayed ignition {Ans: too much air, that electrode settings, weak Transformer, 30 buss bars, cracked or oil-soaked insulators}how is safety timing checked on a stack switch {Ans: remove the stack switch from its holder or disconnect Terminal 3, fire the control and time it's lockout}how is a stack "in step" {Ans: pull out the clutch arm 1/2 inch or so and release slowly. This aligns operating contacts. Cold contacts will close and hot contacts will open}how is line voltage and low voltage shown on a relay control {Ans: all numbered terminals in colored wires used as terminals are line voltage all letters are low voltage}how are sections of smoke pipe secured {Ans: with three sheet metal screws, evenly spaced, and no closer than half an inch from The Edge or end}