SSC JE Mechanical Engineering 24th Jan 2018 Shift-1

Asteel rod whose diameteris 2 cm and is 2 m long, experiences heating of temperature $$30^\circ C$$ to $$150^\circ C$$. The coefficient of thermal expansion is $$\alpha = 12 \times 10^{-6}/ ^\circ C$$ and Young's modulus is 200 GPa. If the rod has been restricted to its original position, then the thermal stress (MPa) developed will be ................

The conditions for the thermal stress in a body are given below.
(1) It is the function of coefficient of thermal expansion.
(2) It is the function of temperaturerise.
(3) It is the function of modulus ofelasticity.

If the stress acting on a pointis in the three dimensions, then what is the number of componentsin a stress tensor required for defining that stress?

If the equivalent torque in a shaft is 500 Nm and the bending momentis 300 Nm. Calculate the magnitude of the required torque and the equivalent bending moment.

What will be the change in length (mm) of a steel bar having a square cross section of dimension 40 mm x 40 mm, whichis subjected to an axial compressive load of 250 kN. If the length of the bar is 4 m and modulus ofelasticity is E = 250 GPa?

Choose the INCORRECT option for the equation of elongation of a uniform rod having length L dueto the self weight W.

Consider the loaded beam as shown in the figure below. Determine the portion of the beam which is subjected to pure bending.

Calculate the total angle of twist for a stepped shaft which is subjected to the torque (T) as shown in the figure below.

Across sectional bar of area 700 mm$$^2$$ is subjected to an axial load as shown in the figure below. What is the value of stress (MPa)in the section RS?

If the diameter of the column is reduced by 30%, then whatwill be the change in the Euler’s buckling load (in %)?