1. A Factor of safety that should be adopted for finding an allowable load for a pile is _________
a) 2.5 and 3
b) 4
c) None of the mentioned
d) All of the mentioned
Explanation: The IS code recommends that for working out allowable load, a minimum factor of safety 2.5 or 3 should be used.
2.For pile in cohesive soil __________ is neglected for individual pile action.
a) Frictional resistance
b) Surface area of pile
c) Shear strength of soil
d) All of the mentioned
Explanation: For the pile in cohesive soil, point bearing is generally neglected for individual pile action, since it is negligible as compared to frictional resistance.
3. The allowable load for the pile is given by __________ equation.
a) Qa = Qup/ F
b) Qa = Qup× F
c) Qa = WH /F(S+C)
d) Qa = WH /6(S+2.5)
Explanation: The allowable load Qp for a pile is given by dividing the ultimate bearing capacity Qup by a suitable factor of safety F.
Qa = Qup/ F.
4. The separation of Q at any stage of loading into Rp and Rf in cyclic test is based on experimental value found out by________
a) Hailey
b) A.F. Van Weele
c) A.M. Wellington
d) MacArthur
Explanation: The separation of Q at any stage of loading into Rp and Rf in cyclic test is based on experimental found value of A.F. Van Weele (1957) that the load on the pile toes (1957) that the load on the pile toe (i.e. RP) increases linearly with the elastic compression of the soil.
5. The test which can be used for separating load carried by the pile is _________
a) Cyclic load test
b) Pile load test
c) Penetration test
d) All of the mentioned
Explanation: The cyclic load test is particularly useful in separating the load carried by the pile into the skin friction and point bearing resistance.
6. The result of Dutch cone penetration test can be applied to determine _________
a) Ultimate skin fraction
b) Total ultimate point
c) Ultimate bearing capacity
d) None of the mentioned
Explanation: The result of Dutch cone penetration test can be applied with sufficient accuracy to determine the ultimate bearing capacity of piles in cohesion soils.
7. The elastic compression Δ L of a pile can be calculated by the expression based on ___________
a) Terzaghi’s theory
b) Hooke’s law
c) Meyerhof’s theory
d) Hiley’s formula
Explanation: The elastic compression Δ L of the pile corresponding to any load Q (= Rf + Rp) can be calculated from the following expression based on Hooke’s law,
Δ L = (Q – Rf/2) L / AE.
8. The efficiency of pile group depends upon __________
a) Characteristic of pile and Spacing of pile
b) Bearing capacity of soil
c) All of the mentioned
d) None of the mentioned
Explanation: The efficiency of pile group depends upon the following factors: Characteristics of pile (i.e. length, diameter, material etc.), spacing of pile, total number of piles in a row and number of rows etc.
9. Which of the following formulae can be used for determining the efficiency of pile group?
a) Dynamic formulae
b) Static formulae
c) Feld’s formulae
d) Hiley’s formulae
Explanation: Converse Labarre formulae, Seiler-kenney formulae, Feld’s rule are some of the common formulae available for determining the efficiency of pile group
10. In which of the following rule, the value of each pile is reduced by one-sixteenth?
a) Converse Labarre formulae
b) Feld’s formulae
c) Seiler-Keeney formulae
d) All of the mentioned
Explanation: According to Feld’s rule, the value of each pile is reduced by one-sixteenth on account of the effect of the nearest pile in each diagonal or straight row of which the pile in question is a member.