The stress concentration is generally expressed by a theoretical stress-concentration factor kt. Generally, Kt is described as the ratio of _________________

The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

A

$$\frac{{{{\text{K}}_{\text{f}}} + 1}}{{{{\text{K}}_{\text{t}}} + 1}}$$

B

$$\frac{{{{\text{K}}_{\text{f}}} - 1}}{{{{\text{K}}_{\text{t}}} - 1}}$$

C

$$\frac{{{{\text{K}}_{\text{t}}} + 1}}{{{{\text{K}}_{\text{f}}} + 1}}$$

D

$$\frac{{{{\text{K}}_{\text{t}}} - 1}}{{{{\text{K}}_{\text{f}}} - 1}}$$

The notch sensitivity q is expressed in terms of fatigue stress concentration factor K_f and theoretical stress concentration factor K_t as

A

$$\frac{{{{\text{K}}_{\text{f}}} + 1}}{{{{\text{K}}_{\text{t}}} + 1}}$$

B

$$\frac{{{{\text{K}}_{\text{f}}} - 1}}{{{{\text{K}}_{\text{t}}} - 1}}$$

C

$$\frac{{{{\text{K}}_{\text{t}}} + 1}}{{{{\text{K}}_{\text{f}}} + 1}}$$

D

$$\frac{{{{\text{K}}_{\text{t}}} - 1}}{{{{\text{K}}_{\text{f}}} - 1}}$$

The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.

A

Working

B

Damaging

C

Allowable

D

None of these

Examine the following statements :
i) Factor of safety for steel should be based on its yield stress,
ii) Factor of safety for steel should be based on its ultimate stress,
iii) Factor of safety for concrete should be based on its yield stress,
iv) Factor of safety for concrete should be based on its ultimate stress.
The correct statements are

A

(i) and (iii)

B

(i) and (iv)

C

(ii) and (iii)

D

(ii) and (iv)

From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
P. The engineering stress-strain curves in tension and compression are identical.
Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.

A

P, Q

B

Q, R

C

Q, S

D

R, S

Tresca or maximum-shear stress criteria assumes that yielding occurs when the maximum shear stress reaches a value of the shear stress in the uniaxial tension test. Assume the principal stress being σ1, σ2, σ3 where σ1 is largest, and σ3 is the smallest principal stresses. Find the value of minimum shear stress to cause yielding, given that yield stress in tension is equal to σo?

A

τ = σo

B

τ = σo/2

C

τ = σo/3

D

τ = σo/4

Which of the following statements regarding stress related factors is/are true and false?
1. Burnout Stress Syndrome (BOSS) is a debilirating psychological condition brought about by unrelieved work stress.
2. 'Good' and 'bad' stresses are also referred to as 'Distress' and 'Eustress' respectively.
3. It is natural and healthy to maintain optimal level of stress.
4. Rustout Stress Syndrome (ROSS) is indicative of stress overload.
5. Anxiety is a state of emotional tension characterised by Apprehension, fearfulness, and psychic pain.

A

1, 2 and 4 are true, 3 and 5 are false

B

2, 3 and 4 are true, 1 and 5 are false

C

1, 3 and 5 are true, 2 and 4 are false

D

2, 4 and 5 are true, 1 and 3 are false

A bar tender replaces some quantity of alcohol having 40% concentration with water and thus the concentration of alcohol changes to 30%. If the alcohol which he replaced is mixed with another sample of 260 ml alcohol having 20% concentration, then a mixture having 27% concentration of alcohol is prepared. Find the initial quantity of alcohol having 40% concentration.

A

520 ml

B

600 ml

C

560 ml

D

580 ml

The concentration of oxygen at the inner surface of the vessel is maintained at a level C depending on the pressure in the vessel, while the concentration at the outer surface is reduced to zero by the escape of oxygen to the surroundings. A steady state will eventually be reached when the concentration everywhere reaches a constant value. Provided D is independent of concentration there will be a single concentration gradient in the wall and the thickness of the wall is L, the flux is given by________________

A

DC/L

B

DL/C

C

CL/D

D

DC/L + K (some constant)

Stress Concentration Factor is the ratio of nominal stress obtained by elementary equations for minimum cross-section and highest value of actual stress near discontinuity.

A

True

B

False

The stress concentration is generally expressed by a theoretical stress-concentration factor kt. Generally, Kt is described as the ratio of _________________

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