Modern Machine-Shop Practice Part 270

Describe these two operations. II. 383.

=Governors.=--What is a throttling governor? What is an isochronal governor? What is a dancing governor? II. 384.

=Forward.=--What is full gear forward? II. 383.

=Backward.=--What is full gear backward? II. 383.

=Starting.=--How would you proceed to start a plain slide valve? II.

384, 400.

=Crank position.=--What is the best position for the crank to be in to start the engine, and why is it the best position? II. 384.

=Taking charge.=--What is the first thing you would do in taking charge of an engine? II. 385.

=Length of connecting rod.=--How would you find out if the connecting rod was the right length to give an equal amount of clearance at each end of the cylinder? II. 385, 404.

=Order of examination.=--In what order should a thorough examination of the engine be made? II. 385.

=Least examination.=--What would const.i.tute the least permissible examination of an engine, with a due regard to safety? II. 385.

=Thorough examination.=--What would const.i.tute a complete examination of a plain slide-valve engine? In what order should such an examination be made? II. 385.

=Quick examination.=--What examination should an engineer make of a plain slide-valve engine, if called upon to start it as quickly as possible without knowing its condition? II. 385.

=Taking a lead.=--How would you take a lead for adjusting the fit of a bearing to its journal? II. 386.

=Set of slide valve.=--How would you test whether the slide valve was set properly? II. 386.

=Squaring a valve.=--Is it proper to square a plain slide valve? II.

386.

=Lead affected by wear.=--How does the wear of the parts affect the lead in vertical engines? II. 386.

=Heating of crank-shaft.=--What would you do if the crank-shaft bearings began to heat? II. 386.

=Hot crank-pins.=--What are the princ.i.p.al causes of hot crank-pins? II.

386.

=Heating.=--What part of the engine is the most likely to get hot from the friction of the fit? II. 386.

=Use of lead.=--What is a lead used for in adjusting the fit of a bra.s.s to its journal? II. 386.

=Fit of top bra.s.s.=--When a liner is used between the two bra.s.ses, what does the fit of the top bra.s.s depend upon? II. 386.

=Oiling.=--In oiling the engine, what precaution would you take to prevent the journals from heating? II. 401.

=Cold weather.=--What is liable to happen to an engine that is used out of doors in cold weather? II. 386.

=Leaky throttle valve.=--What damage might a leaky throttle valve do, and how would you prevent it? II. 386.

=Leaky check valve.=--What damage may a leaky check valve do, and how would you prevent it? II. 387.

=Freezing in the pump.=--How would you prevent the water from freezing in the pump? II. 387.

=Freezing oil.=--How would you prevent the oil from freezing? II. 387.

=Thawing oil.=--How would you thaw frozen oil? II. 387.

=Setting a portable engine.=--How should a portable engine stand when it is at work, and why should it stand so? II. 387.

=Natural supply of water.=--What precaution would you take when feed water is drawn from a stream, or other natural source of supply? II.

387.

=Pumps.=--Into what cla.s.ses may pumps be divided? What is a force pump?

What is a piston pump? What is a single-acting pump? What is a double-acting pump? II. 387.

="Suction."=--What causes the flow of water up the suction pipe of a pump? How high can a pump lift water, or cause it to lift or rise? II.

388.

=Regulating a pump.=--How can the quant.i.ty of water a pump will deliver be regulated? II. 388.

=Pump valves.=--What is the check valve of a pump? What is the foot valve of a pump? II. 388.

=Speed of pumping.=--What is the highest speed at which a pump should run? What is the consequence if a pump runs too fast? II. 388.

=Locating the air chamber.=--When should the air chamber be placed on a pump, and what is its use? II. 388.

=Belt pump.=--What is the advantage possessed by a belt pump? II. 388.

=Starting bar.=--What is a starting bar, and what is it used for? II.

389.

=Link sketch.=--Make a rough sketch of a locomotive link motion. II.

392.

=Link gear and eccentric.=--Does a link motion when in full gear operate the valve much different to what a simple eccentric motion would do? II.

393.

=Exchanging eccentric rods.=--If the forward eccentric rod was to break, could the backward eccentric be utilized to run the engine forward? If so, how? II. 393.

=Broken reach rod.=--How would you hold the tumbling shaft if the reach rod broke? II. 393.

=Eccentric and crank motions.=--Does the acting eccentric lead or follow the crank when the link is in full gear? II. 393.

=Setting a slide valve.=--In what position would you place the link motion when the slide valve is to be set? II. 394.

=Length of eccentric rod.=--What determines the length of the eccentric rods when setting the slide valve? II. 394.

=Setting an Allen valve.=--What difference is there between setting a common slide valve and another (an Allen) valve? II. 395.