**Mechanical Engineering Written Exam Questions (BIWTA)**

**Company- Bangladesh Inland Water Transport Authority (BIWTA)**

**Post- Assistant Engineer-Mechanical**

➦ What is “ton of refrigeration (TR)”

➦

__Define boiler mountings with examples__.

➦

__Define boiler accessories with examples__.

➦

__Write down the four laws of thermodynamics__.

➦ Draw the typical stress-strain diagram of mild steel showing proportional limit, yield strength, ultimate strength and breaking strength on it.

➦ Define modulus of elasticity and modulus of rigidity. For a material which one is greater?

➦ A solid steel shaft in a rolling mill transmits 20 kW at 2 Hz. Determine the diameter of the shaft if the shearing stress in not to exceed 40MPa.

➦

A uniformly distributed load of magnitude w is applied over the whole span of a simply supported beam of length L. Draw the shear force and bending moment diagrams of the beam.

➦ A furnace wall of thickness 1 m and of surface area 2 m^{2}is made of a material whose thermal conductivity is 20 W/m.K. The temperatures of the inner and outer surfaces of the wall are 10000

^{0}C and 2000

^{0}C, respectively. Determine the heat flow through the wall.

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