ISRO Scientist or Engineer Mechanical 2016
For the following questions answer them individually
Air is heated from $$0^\circ C$$ to $$100^\circ C$$ in a sealed metal container. Its density
If a certain massof moist air in an air tight vessel is heated to a higher temperature, then
Air is accelerated isentropically from 100 m/s to 300 m/s in a nozzle. If the temperature at the inlet is $$127^\circ C$$, the inlet Mach number is (take R = 287J/(kg K) and specific heat ratio = 1.4)
Two equal forces are acting at a point with an angle of $$60^\circ$$ between them. If the resultant force is equal to $$60 \sqrt{3}$$ , what is the magnitudeof each force?
Four forces of magnitudes 20 N, 40 N, 60 N and 80 are acting respectively along the four sides of a square ABCD as shown in figure. The magnitude of resultant is
In a simply supported beam loaded as shown in figure, the maximum bending moment in Nm is
Two steel rails each of 12 m length are laid with a gap of 1.5 mm at ends at a temperature of 24°C. The thermal stress produced at a temperature of $$40^\circ C$$ is (take $$E = 2 \times 10^5$$ N/mm$$^2$$ coefficient of thermal expansion = $$12 \times 10^{-6}/^\circ C$$)
An aluminum tensile test specimen has a diameter, $$d_o = 25 mm$$ and a gauge length of $$L_o = 250 mm$$. If a force of 175 KN elongates the gauge length by 1.25 mm, the modulus
of elasticity of the material is nearly
