Engineering Questions with Answers - Multiple Choice Questions

Friction Circle Method

1 - Question

In the friction circle method, it is assumed that the resultant reaction is ___________ to the friction circle.
a) Perpendicular
b) Tangential
c) Parallel
d) None of the mentioned

View Answer

Answer: c
Explanation: In the friction circle method, it is assumed that the resultant reaction is tangential in the friction circle, since the error involved in this assumption is of small magnitude.




2 - Question

The friction circle may be also referred as __________
a) φ-circle
b) Plane circle
c) Cohesion circle
d) All of the mentioned

View Answer

Answer: a
Explanation: The friction circle having radius r sin φ is also called as φ-circle.




3 - Question

A circle is considered to be a critical slip circle, if it has ___________
a) Maximum factor of safety
b) Minimum factor of safety
c) Maximum radius
d) All of the mentioned

View Answer

Answer: b
Explanation: The circle giving minimum factor of safety Fc is considered as a critical slip circle.




4 - Question

The factor of safety with respect to cohesion is given by the equation ____________
a) FC = HC / H
b) FC = C / Cm
c) FC = τf / τ
d) All of the mentioned

View Answer

Answer: b
Explanation: The factor of safety Fc with respect to cohesive strength, based on the assumption that the frictional strength has been fully mobilized, is given by
FC = C / Cm.




5 - Question

The friction circle method assumes the failure surface as ___________
a) Cycloid
b) Curve
c) Arc of circle
d) None of the mentioned

View Answer

Answer: c
Explanation: Similar to Culmann’s method, the friction circle method also assumes the failure surface as the arc of circle.




6 - Question

The forces acting on a sliding wedge are ___________
a) Weight of the wedge
b) Total frictional force
c) Total cohesive resistance
d) All of the mentioned

View Answer

Answer: d
Explanation: The forces acting on a sliding wedge are i) the weight of the wedge ii) the total frictional resistance or resultant, and iii) total cohesive resistance along the slip circle.




7 - Question

The factor of safety Fc with respect to cohesive strength is based on the assumption that ___________
a) Frictional force is fully mobilized
b) Frictional force is zero
c) Total cohesive resistance is zero
d) All of the mentioned

View Answer

Answer: a
Explanation: The factor of safety with respect to cohesive strength, based on the assumption that frictional force has been fully mobilized, and the equation is given by FC = C / Cm.




8 - Question

The factor K, in the radius of the friction circle(Kr sin φ) depends on ____________
a) Radius of the frictional circle
b) Frictional resistances offered
c) Cohesive resistance
d) Central angle of the slip arc

View Answer

Answer: d
Explanation: In the frictional circle radius of Kr sin φ, the factor K depends on the central angle δ of the slip arc.

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