Tensile Test of Mild Steel

Q. The stress - strain curve for an ideally plastic material is

1. 
2. 
3. 
4. 

Q. Consider the following salient points in a stress•strain curve of a mild steel bar:
1. Yield point
2. Breaking point
3. Yield plateau
4. Proportionality limit
5. Ultimate point
The correct sequence in which they occur while testing the mild steel bar in tension from initial zero strain to failure is

1. $4,1,2,3$ and $5$
2. $1,4,3,5$ and $2$
3. $4,1,3,5$ and $2$
4. $1,4,2,3$ and $5$

Q. A compounded bar consists of material A encased in material B. It is tightly secured at the ends. The coefficient of thermal expansion of A is more than that of B. If the temperature of the bar is increased, the stresses induced will be

1. tensile in both materials
2. Compressive in both mate'rials
3. tensile in material 8 and compressive in material A
4. compressive in material 8 and tensile in material A

Q. What is the nature of stress in a ceiling fan rod?

1. Bending
2. Tensile
3. Compressive
4. Shear

Q. A prismatic bar of uniform cross-sectional area of $5c{m}^2$ is subjected to axial loads as shown in the given figure.



Portion BC is subjected to an axial stress of

1. $400kg/c{m}^2$ tension
2. $2000kg/c{m}^2$ compression
3. $1000kg/c{m}^2$ tension
4. $600kg/c{m}^2$ tension

Q. Elastic limit is the point

1. up to which stress is proportional to strain
2. at which elongation takes place without application of additional load
3. up to which if the load is removed, original volume and shape are regained
4. at which the toughness is maximum

Q. The stress level, below which a material has a high probability of not failing under reversal of stress, is known as

1. elastic limit
2. endurance limit
3. proportional limit
4. tolerance limit

Q. The material in which large deformation is possible before the absolute failure or rupture is termed as

1. brittle
2. elastic
3. ductile
4. plastic

Q. The material in which large deformation is possible before absolute failure by rupture takes place, is known as

1. Ductile
2. Plastic
3. Brittle
4. Elastic

Q. Consider the following statements:
1. Failure occurs beyond elastic limit.
2. Rupture takes place immediately after elastic limit.
3. Permanent set occurs beyond elastic limit
Which of these are considered in the theories of failure? ·

1. $1,2$ and $3$
2. $1$ and $3$ only
3. $2$ and $3$ only
4. $1$) and $2$ only

Q. In mild steel specimens subjected to tensile test cycle, the elastic limit in tension is raised and the elastic limit in compression is lowered. This is called

1. Annealing effect
2. Bauschinger effect
3. Strain rate effect
4. Fatigue effect

Q. Assertion (A): A mild steel tension specimen subjected to an axial load fails along a surface at 45° to its axis.
Reason (R): Mild steel is weaker in shear than in tension and the place of maximum shear is at 45° to its axis

1. Option A
2. Option B
3. Option B
4. Option C

Q. What is the stress at the section $x-x$ for the bar $ABCD$ with uniform cross-section $1000m{m}^2$?

1. $20N/m{m}^2$ (Tensile)
2. $30N/m{m}^2$ (Compresssive)
3. $80N/m{m}^2$ (Tensile)
4. $50N/m{m}^2$ (Compressive)

Q. A composite system where the components are of equal lengths is subjected to temperature rise. Which one of the following stresses will be developed in the component having highest coefficient of linear expansion?

1. Compressive stress
2. Tensile stress
3. Shear stress
4. Zero stress