ISRO Scientist or Engineer Mechanical 2014

A 20 KN weight is suspended by two wires as shown in the figure. The length of each wire is 2 meter. The steel wire (E value 200 GPa) has an cross-sectional area of $$60 \times 10^{-6} m^2$$ and the aluminum wire(E value 70 GPa) has an cross-sectional area of $$120 \times 10^{-6} m^2$$, The stress in aluminum wire is

A bar of bronze and a bar of steel are placed between two immovable supports, A & B as shown in the figure. The physical constants are: (where L= length of bars, A = cross-sectional area, $$\alpha =$$ linear co-efficient of thermal expansion, E= Young’s modulus)

The stresses in the steel & bronze, when temperature drops by $$50^\circ C$$ is

Arigid bar with wires at B & C is shown in the figure below. The cross sectional area of the wire at Bis $$3 \times 10^{-4} m^2$$ and at C is $$2 \times 10^{-4} m^2$$. The wires are elasto- plastic with strength 250 MPa and E value 200 GPa. The ultimate load P that can be applied to the rigid bar, as shown is

The fundamental natural frequency of the cantilever beam with point load P acting at thefree end, in rad/sec is

The structure which has the highest packing of atoms

Elastic stress distribution in the cross section of a curved beam under pure bending is

Dimension of shaft is $$100_{0.00}^{+0.01}$$ and and corresponding Hole diameter is $$100_{0.01}^{+0.02}$$. The maximum material condition of the fit is

Match List 1 with List-II and select the correct answer.

In case of steady incompressible laminar viscous flow between two stationary parallel plates, the velocity distribution is

Two pipe lines of equal length are connected in series. The diameter of secondpipe is two times thatof first pipe, the ratio of head loss between first and second pipe is