#17 The results of a field exploration are studied in order to determine the fea

Question

#17

The results of a field exploration are studied in order to determine the feasibility of constructing a large mat foundation. In the subgrade immediately below the proposed mat location is a layer of dry silty sand of high resistivity. Beneath that is a thick layer of submerged, normally consolidated clay. What conditions govern placement of the foundation at this location?

(A)

bearing capacity

(B)

settlement

(C)

sliding

(D)

soil corrosion

#10

Which statistical variable is NOT normally used in spot speed studies?

(A)

kurtosis

(B)

Mean speeds

(C)

Median speeds

(D)

Mode speeds

#11

Two identical vehicles approach each other from opposite directions on a one-lane road with a 6% grade. Both vehicles are initially traveling at 60 kph. The coefficient of friction, F, between the tires and the roadway is 0.20. The reaction time for the drivers in both vehicles is 0.50 s. Including reaction time, approximately how much time will it take for the vehicle traveling downhill to stop?

(A)

8.0 s

(B)

10 s

(C)

12 s

(D)

13 s

#12

Traffic analysis involves random events taking place during intervals of time. The probability of a certain number of events taking place during a specified time interval is evaluated using the

(A)

Poisson formula

(B)

Bernoulli formula

(C)

standard deviation

(D)

Monte Carlo simulation

#13  

Railroad track ballast is a layer of crushed hard aggregate placed on top of the subgrade. It serves many purposes. Three of the following are essential functions of track ballast. Which one is not?

(A)

reducing frost heave by reducing of capillary action

(B)

reducing thermal expansion and contraction of the rail

(C)

distributing the tie load to the subgrade

(D)

anchoring the ties against lateral movements

#14  

A site investigation is used to determine the type of foundation required to support a proposed structure. What type of soil sample or test is typically obtained to determine in situ moisture content and density?

(A)

disturbed (bulk) samples

(B)

relatively undisturbed samples

(C)

standard penetration test

(D)

pocket penetrometer test

#16

What vehicle classifications are used by AASHTO in intersection turning design?

(A)

P, SU, and WB

(B)

P, SU, B, and WB

(C)

P, SU, WB, and MH

(D)

P, SU, Bu, and WB

Explanation / Answer

#17) (B) settlement : The Thick layer of submerged, normally consolidated clay will start to consolidate once the effective stresses in soil are increased due overburden load of structure. thus settlement conditions govern placement of the foundation at this location.

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