GTCL Written Exam Questions for Mechanical Engineers

1. Draw the typical stress-strain diagram of mild steel showing yield strength, ultimate strength and breaking strength on it.
2. A concentrated load P is applied at the mid span of a simply supported beam of length L. Draw the shear force and bending moment diagrams of the beam. (see solution) 
3. A steel rod of 1 cm² in cross-sectional area and 100 cm long is subjected to an axial pull of 2000 kgf. Find the elongation of the rod. considering E= 200 GPa. (see solution) 
4. Write down the Bernoulli’s equation for ideal and real fluid. 
5. An ice plant produces 100 tons of ice in 24 hrs. If the plant uses water at 20⁰ C, find its cooling capacity. Specific heat and latent heat of solidification of water are 4.2 kJ/kg/K and 334 kJ/kg respectively. (See solution) 
6. Draw the performance characteristics curves of a centrifugal pump. 
7. A centrifugal pump is used to raise water at a height of 100 ft with discharge of 2.0 cusec. The efficiency of the pump is 62 %. Find the input horse power of the pump. 
8. Define “ton of refrigeration”. 
9. How do you identify a petrol engine and a diesel engine? 
10. What are the functions of an economizer and safety valve in a boiler?