**Mechanical Engineering Written Exam Questions (PGCL-2010)**

Company- Paschimanchal Gas Company Limited (PGCL)

Post- Assistant Engineer-Mechanical

Year- 2010

➦ Define isotropic
materials and homogeneous materials, give an example of each.➦ Define Boundary layer. Draw a sketch showing different boundary-layer flow regimes on a flat plate.

➦ Find the maximum torsional shear stress in a solid circular shaft of diameter 10 mm, when the applied torque is 30N.m.

➦ Draw TOP and LEFT SIDE VIEW
of the object shown.

_{1}=7×10

^{-4}m

^{2}and A

_{2}=4×10

^{-3}m

^{2}.

_{ }Determine the increase in static pressure between section 1 and section 2. Assume frictionless flow and water density 1000 kg/m

^{3}.

➦ For the plane
stress shown in the stress element, draw the Mohr’s circle to find the maximum
in-plane shearing stress and corresponding normal stress.

➦ Construct shear and
bending-moment diagrams showing peak values for the simply supported beam
loaded with the forces shown in figure.

➦ Draw the open cycle
gas turbine in simple block diagram form and show the corresponding processes
on a T-S plane.➦ What is cavitation? List any two problems caused by cavitation in turbines.

➦ Compute the pressure drop when water flows at 3 liter/s through a steel pipe with diameter 50 mm and 40 m length. Assume, density of water 1000 kg/m

^{3}and friction factor f=0.02.

➦ A composite wall of two 0.5 m thick layers has a temperature 150

^{o}C on one face and 10

^{o}C on the other face. Thermal conductivity of layer-1 is k

_{1}=0.05 W/m-K and layer-2 is k

_{2}=0.5 W/m-K. Consider face area A

_{1}=A

_{2}=2 m

^{2}. What is the combined thermal resistance of the wall? Find the heat transfer per unit surface area.

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