Modern Machine-Shop Practice Part 268

=Strain on boiler joint.=--How would you calculate the amount of stress there is upon the riveted joint of a boiler? II. 350.

=Shearing strain.=--What is meant by the terms, shearing, tearing and crushing strains of a steam boiler? II. 351.

=Lapped and b.u.t.t joints.=--How does a lapped joint differ from a b.u.t.t joint or seam in a boiler? II. 352.

=Chain and zigzag riveting.=--How does a chain riveted joint differ from a zigzag riveted joint? II. 352.

=b.u.t.t joint.=--What are the advantages of the b.u.t.t joint? II. 352-353.

=Margin for holes.=--How would you find the proper distance the rivet holes should be from the edge of the plate in a boiler seam? II. 353.

=s.p.a.cing rows Of rivets.=--How would you find the distance apart for the rows of rivet holes in a double riveted joint? II. 353.

=High percentage joint.=--What is meant by a "high percentage" riveted joint? II. 353.

=Single and double shear.=--What is meant by a rivet being in single shear or double shear? II. 353.

=Allowance for shear.=--How much additional allowance is made in the shearing strength of a rivet in double shear over that of the same rivet if in single shear? II. 358.

=Taking charge of a boiler.=--What is the first thing you would do in taking charge of a boiler? II. 368, 400.

=First inspection.=--What part of the boiler would you inspect first?

II. 368.

Safety valve defect.--To what defect is a safety valve most liable? II.

368, 400.

=Water supply.=--How much water should there be in the boiler when the fire is lit? II. 368.

=Reliability of gauge gla.s.s.=--Is a gauge gla.s.s always reliable for showing the height of the water in the boiler? II. 368, 402.

=Testing gauge gla.s.s.=--What would you do to find out if the gauge gla.s.s was showing the correct water level? II. 368.

=Condensation in boiler.=--What is likely to happen if the steam condenses in the boiler without any of the c.o.c.ks being open? II. 368, 400.

=Cleaning a boiler.=--What parts of the boiler would you clean before lighting the fire? II. 368.

=Laying a fire.=--How would you lay the fire? II. 368.

=Quick combustion.=--Does bituminous (soft) or anthracite (hard) coal light more easily? II. 368.

=First coal.=--How soon would you put coal on after the fire is lit? How deep would you make the first layer of coal? II. 368, 401.

=Amount of coal.=--How much coal would you put on the fire at a time?

II. 368, 401.

=Even heat.=--How can an even temperature be kept up in the fire box?

Why is it necessary to keep an even temperature in the fire box? II.

368, 370.

=Shaking grate.=--What is the advantage possessed by shaking grate bars?

II. 369.

=Before cleaning a fire.=--What preparations would you make before cleaning the fire? II. 369.

=Fire tools and their uses.=--What tools are used in cleaning a fire?

And what is the use of each? II. 369.

=Draught while firing.=--How should the draught be regulated while the fire is being cleaned? II. 369.

=Temporary interruption.=--What should be done to prevent blowing off through the safety valve when the engine is stopped and no steam is being taken from the boiler? II. 369.

=Blue flame.=--What does blue flame in the fire box indicate? II. 369.

=Water supply at night.=--How much water would you have in a boiler when leaving it for all night? II. 369.

=Fire at night.=--How would you leave the fire for the night? II. 369.

=Banking.=--What is banking a fire? Give a safe method of banking a fire. II. 369, 401.

=Dampers at night.=--How should the dampers be left when the fire is banked? II. 369.

=Safety valve at night.=--How would you set the safety valve for a banked fire? II. 369.

=Opening a banked fire.=--What is the first thing to do in starting up a banked fire? II. 369, 401.

=Regulating boiler feed.=--How would you regulate the boiler feed? II.

369.

=Regulating a pump.=--How can a pump be regulated so as to be kept pumping without surcharging the boiler? II. 369.

=Even boiler injection.=--Can a continuous feed be maintained if injectors are used? II. 370.

=Stuck valve.=--How may a stuck valve or a check valve be released? II.

370.

=Hot feed water.=--What would you do if the feed water got so hot that the pump worked imperfectly or not at all? II. 370.

=Scale.=--What causes scale to form in the boiler and what effect does scale have on the boiler? II. 370.

=Preventing scale.=--What are the princ.i.p.al methods employed to prevent the formation of scale in the boiler? II. 370.

=Horizontal heater.=--What advantage does a horizontal heater possess?

II. 370.

=Dirty gauge gla.s.s.=--What should be done to the gauge gla.s.s if the feed water is dirty? How many times a day should the gauge be blown out? II.

370.

=Priming.=--What is the priming or foaming of the water in a boiler?