Briefly discuss what factors are considered in the design of an at-grade railway crossing in addition to those for an at-grade crossing formed by two highways.
What will be an ideal response?
As with intersections of roadways, general design principles include the
crossing occurring at a right angle if possible and far enough from intersections
and entrances so that turning maneuvers at these locations do not affect operations
at the highway-rail grade crossing. Additional design criteria for the highway-rail
grade crossing include the surface of the crossing roadway at the same level as the
top of the tracks for a distance of 2 ft from the outside of the rails. Also, at a point
on the roadway 30 ft from the nearest track, the elevation of the road should not
be higher or lower than 0.25 ft than the elevation of the tracks unless this cannot
be achieved because of the superelevation of the track.
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During a pick-and-carry operation with a suspended load, _____.
a. creep speed is best b. outriggers should always be extended c. keep the load as high as possible d. OSHA reduces spotters at the front and rear
The ____________________ brings fuel and air into the cylinder
Fill in the blank(s) with the appropriate word(s).
Grounding is ___________ a. The insertion of a copper rod into the earth down to 8 feet. b. An electrical connection of all metal parts of a solar photovoltaic system to a system of copper conductors thatterminates at copper rods that are inserted into the earth
c. A safety circuit that helps protect the solar photovoltaic system from lightening strikes and short circuits. d. All the above are true.
Sometimes in the automotive trade the diameter is referred to as the ____________________.
Fill in the blank(s) with the appropriate word(s).