# Test: The Mohr - Coulomb Failure Envelope

## 10 Questions MCQ Test Soil Mechanics | Test: The Mohr - Coulomb Failure Envelope

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Attempt Test: The Mohr - Coulomb Failure Envelope | 10 questions in 20 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study Soil Mechanics for Civil Engineering (CE) Exam | Download free PDF with solutions
QUESTION: 1

### The Mohr’s theory of failure can be symbolically expressed as____________

Solution:

Mohr’s theory of failure can be symbolically expressed as:
σmax–σmin =f (σmax +σmin) or τmax=f (σn).

QUESTION: 2

### The concept of a three dimension yield envelope was presented by_________

Solution:

the effect of intermediate principal was studied by D.C. Drucker and W. Prager in 1952, who proposed the concept of a three dimensional yield envelope.

QUESTION: 3

### A major drawback of Mohr criterion is____________

Solution:

The major drawback of Mohr criterion is that the curved shape of the envelope, hence the functional form of the equation τmax=F (σn) is not amendable to mathematical computation.

QUESTION: 4

The yield or failure criterion can be expressed as____________

Solution:

The yield criterion may be expressed as f (I1, I2, I3) =0
Where I1, I2, I3 are the invariant of stress.

QUESTION: 5

If the auxiliary plane in hydrostatic axis passes through the origin, then its equation is_____________

Solution:

If the auxiliary plane passes through the origin its equation is σ1+σ2+σ3=0 and equation will be σ1+σ2+σ3=constant if the plane is perpendicular to the hydrostatic axis.

QUESTION: 6

The intersection of the yield surface or envelope with octahedral plane is called____________

Solution:

The intersection of yield surface with octahedral plane is called the failure locus .A point on the failure locus represents the stress state at incipient failure.

QUESTION: 7

The hydrostatic pressure’s inability to produce failure under normal pressure was first demonstrated by___________

Solution:

Experiments conducted by Cross land in 1965 have demonstrated that a pure state of hydrostatic pressure is unable to produce failure even under enormous pressure.

QUESTION: 8

Which of the following equation represent hydrostatic pressure in its purest form?

Solution:

According to cross land σ1=σ2=σ3 represent hydrostatic pressure in its purest form.

QUESTION: 9

The Mohr-Coulomb criterion assumes that the strength of the soil is independent of____________

Solution:

The Mohr-Coulomb criterion implicitly assumes that the strength is independent of the intermediate principal stress σ2.

QUESTION: 10

The auxiliary plane in the hydrostatic axis can also be called as___________

Solution:

Since all the points in the auxiliary plane represent deviatorial state of stress, the plane is also called the deviatoric plane. Use Code STAYHOME200 and get INR 200 additional OFF Use Coupon Code