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PE 8 Hour Exam > Depth - Transportation > Flashcards

Depth - Transportation Flashcards

1
Q

how many different definitions are there for radius formula? and which ones?

A

2 different formulas. the chord and arc definition

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2
Q

In horizontal curve problems what is the definition of L and Lc?

A

L = length of the arc and Lc = length of the chord

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3
Q

what is the deflection angle?

A

an angle that is between the BC and any point along the curve. formula no longer in reference manual

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4
Q

how do you find the station of the PT in a horizontal curve?

A

find the station of PC and find the length of the arc then add them together

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5
Q

what is the difference between the long chord and a chord?

A

there is no difference it is the same value

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6
Q

what can be found dividing the inflection angle (delta or I) by 2?

A

deflection angle can be found

deflection angle formula is not given in reference manual

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7
Q

what is important to remember about the difference in the intersection angle and the degree of curvature?

A

the degree of curvature is a sliver of the intersection angle. the degree of curvature is also WITHIN the intersection angle hence why it is much smaller than delta angle.

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8
Q

what should i do for problems where i am given 2 bearings?

A

draw the tangents, find where they intersect, and then find the intersection/delta angle

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9
Q

how should i approach reverse curve problems?

A

whenever given a reverse curve problem always find the forward tangent, then find the length of curves for both of those curves

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10
Q

the tangent that is shared in a reverse curve is a combination of what?

A

the shared tangent is T1+T2 in the reverse curves

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11
Q

in vertical design, what is important to remember about the parabolic equation and the units?

A

when finding the elevation always have the units in STATIONS not feet

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12
Q

are vertical curves symmetrical?

A

yes

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13
Q

is the lowest point of a sag curve at the PVI?

A

false it is not in the middle of the curve

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14
Q

when reading the azimuth and bearings name the degrees for each quadrant

A

NE=0 degrees to 90 degrees
SE=91 degrees to 180 degrees
SW= 181 degrees to 270 degrees
NW=271 degrees to 360

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15
Q

what is headway?

A

the spacing between cars but in the units of time (sec/veh)

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16
Q

is there a formula in the reference manual that contains monthly or seasonal factors for ADT?

A

yes!!

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17
Q

what is the difference between time mean speed and space mean speed?

A

TMS = the mean of the speeds of the cars passing a specific point

SMS = mean of the speeds of vehicles passing through a stretch of the fwy

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18
Q

how do you find the elevation for BVC in vertical curve design? (formula)

A

Elevation PVI - g1(L/2)

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19
Q

what is a method of solving a compound curves problem?

A

to solve a compound curves problem create a triangle between the 2 curves and find the interior angles from the 2 bearings given

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20
Q

can PHF be greater than 1?

A

no PHF should not exceed 1

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21
Q

what happens to speed as it decreases?

A

density increases as speed decreases

22
Q

what is the volume to capacity ratio?

A

the volume to capacity ratio is used to calculate the LOS

23
Q

what is free flow speed?

A

the mean speed of cars during a low volume and low density

24
Q

what is a clinker?

A

a shiny surface material that is rock which later gets turned into a powder and can be found in PCC

25
Q

what happens to hydration when the cement has very fine sands in it?

A

it reduces the time cement needs to hydrate and it can reach its max strength faster

26
Q

when using water for concrete design what should it be?

A

potable, clean, and water that does not contain any odors.

27
Q

what is the Los Angeles abrasion test?

A

it is used to measure aggregates’ toughness and abrasion resistance. the aggregate is placed in a huge drum and is rolled and hit for 500 revolutions. afterwards it is sieved and the percentage passing the sieve corresponds to the abrasion of the aggregates

28
Q

what is SSD?

A

saturated surface dry is the condition where aggregate doesn’t absorb any portion of the mixing water and does not add to the mixing water

29
Q

can the strength of PCC exceed the aggregates strength?

A

no it cannot exceed the aggregates strength

30
Q

what is a well graded aggregate?

A

it is an aggregate mix that is dense and has a variety of soils and sands

31
Q

what do air entrainers do?

A

air entrainers produce tiny bubbles in the hardened concrete that provide extra space for expansion in water due to freezing

32
Q

what is a water reducer?

A

they reduce the extra amount of water that is needed for the workability w/o having to add extra water but still increase the concrete’s workability

33
Q

what does work ability do to the mix?

A

workability is increased, reduces slumps, workability is achieved at a lower W/C ratio so strength is increased, and less materials (water) then it is cost effective

34
Q

what is a super plasticizer?

A

high range water reducers that greatly increase flowability of concrete and reduce the amount of water. also have been used to help sections with thin concrete

35
Q

what is a retarder?

A

use whenever you cast in high temperature areas OR wherever placing in long members. it increases the time between mixing and finishing the concrete

36
Q

what is a corrosive component of accelerators?

A

calcium chloride

37
Q

what can fly ash do for concrete?

A

fly ash extends the hydration process, reduces water, reduces air content, increases the workability, and reduces the heat in hydration

38
Q

what is a pozzolan?

A

it is a aluminous material which in itself has little or no cementitious properties but when added in water will react with calcium and process cementitious properties

39
Q

how is workability measured?

A

workability is measured through slump. remember we did the slump test by creating a concrete mix and placing it in a cone and seeing how much it will shrink due to water ratio

40
Q

in hardened concrete, what is obtained on the 28th day?

A

the compressive strength is obtained on day 28 or the peak of the curve

41
Q

why do we pick the offset at 0.002 from the stress and strain concrete graph?

A

that is where the yield strength will be found

42
Q

when tested, when is compressive strength is acceptable?

A

average of 3 tests are greater than or equal to fc and none of the test results are less than fc + 500 psi (if fc is <= 5000 psi)

43
Q

what is another formula for the SSD using the middle ordinate and radius?

A

SSD = (R/28.65) * (cos -1*(1-M/R))

44
Q

what is the formula for RMEV?

A

RMEV = no of accidents * 10^6 / (ADT * 365 days *number of years)

45
Q

what design manual can i find information on ADA curb ramp and sidewalks on?

A

you can find it in the AASHTO greenbook

46
Q

what is the average walking speed of a pedestrian?

A

3.5 ft/s

47
Q

what is the superpave method?

A

the superpave method is a mix design that involves lab compaction and performance testing. the superpave number also depends on the temperature testing for a 7 day maximum design temp

48
Q

what does an ahead tangent mean?

A

ahead tangent is the tangent corresponding to the back tangent

49
Q

when solving a crest curve problem and asking for length of curve with questionable weather conditions, which table should you use?

A

use the decision sight table with “maneuver conditions”

50
Q

what is the formula for the accident rate along a certain distance?

A

A = (# of accidents)*(10^8) / (ADT)(L)(365)(# of years)

51
Q

when solving an accident rate problem, does property damage count?

A

no it doesnt. any other injury like personal or item fatal accident counts

52
Q

what is the average haul distance?

A

A/Q

divide the area by the volume

PE 8 Hour Exam (8 decks)

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