# MCQs on Fluctuating Stresses & Fatigue Failure

1 - Question

The stress represented by sin (t) + 1 belongs to which category?

a) Fluctuating Stresses
b) Alternating stresses
c) Repeated Stresses
d) Reversed Stresses

2 - Question

The stress represented by sin (t) + 2 belongs to which category?

a) Fluctuating Stresses
b) None of the mentioned
c) Repeated Stresses
d) Reversed Stresses

Explanation: The mean as well as the amplitude value is non zero hence it belongs to Fluctuation Stress Category.

3 - Question

The stress represented by sin (t) + 4 belongs to which category?

a) Alternating Stresses
b) None of the mentioned
c) Repeated Stresses
d) Reversed Stresses

Explanation: The mean as well as the amplitude value is non zero hence it belongs to Alternation Stresses category which is the other name of Fluctuation Stresses.

4 - Question

The stress represented by cos (t) belongs to which category?

a) Fluctuating Stresses
b) Alternating Stresses
c) Repeated Stresses
d) Reversed Stresses

Explanation: Half cycle is in tensile stress and other half in compressive stress, hence it belongs to Reversed Stresses Category.

5 - Question

If the mean stress value for a sinusoidal stress function is zero, then this type of stress falls in which category?

a) Fluctuating Stresses
b) Alternating Stresses
c) Repeated Stresses
d) Reversed Stresses

Explanation: If mean is to be zero, then there must be compressive as well as tensile stresses and hence belongs to reversed stresses category.tresses

6 - Question

The phenomenon of decreased resistance of the materials to fluctuating stresses is the main characteristic of _____ failure.

a) Fracture
b) Fatigue
c) Yielding
d) None of the mentioned

Explanation: Fatigue failure of the material is the failure at low stress levels under fluctuating syresses.

7 - Question

Fatigue failure is time dependent failure.

a) True
b) False

Explanation: Fatigue failure is defined as time delayed fracture under cyclic loading

8 - Question

There is sufficient plastic deformation prior to fatigue failure, which gives a warning well in advance.

a) True
b) False