Q. What would you do with a cracked plate?
A. Cut out the damaged part and put a patch over it.
Q. How would you change the water in a boiler when steam is up?
A. By supplying more feed water and opening the surface blow-off at short intervals.
Q. When blowing off a boiler, would you leave the blow-off cock to attend to other work?
A. Never.
Q. What would you do to relieve the pressure on the boiler if the safety valve was stuck and steam constantly rising?
A. Cover the fire with coal or ashes, close draught door and open damper in smoke box; work off the steam with the engine and when boiler has cooled down put the safety valve in working order.
Q. What may be the result if you allow the water in the boiler to get low?