Fundamentals of Mechanical Engineering Unit 4 – Introduction to Fluid Mechanics and Applications: AKTU previous year questions
48 AKTU questions from Unit 4 (Introduction to Fluid Mechanics and Applications) asked in 2021–2026, tagged by marks, year and topic. In short: about 27 marks of every paper come from this unit; the most asked topic is Fluid Properties (29 times); 31 questions came back in a later year. The latest ones are listed below; on the page you can filter them by 2-mark or long questions, topic and repeats.
Unit 4 previous year questions
- A liquid has a density of 850 kg/m³. Calculate its specific gravity. (2 marks, 2026, Fluid Properties)
- Define the term priming in the pump. (2 marks, 2026, Hydraulic Pumps)
- Draw the diagram and explain the working of a suspended hydraulic lift. (7 marks, 2026, Hydraulic Pumps)
- A pipe of diameter 55 cm carrying water at an average velocity of 5 m/s branches into two pipes of diameters 40 cm and 30 cm. Find the discharge in the main pipe and the velocity in the 30 cm diameter pipe, given that the velocity in the 40 cm pipe is 5 m/s. (7 marks, 2026, Fluid Properties)
- Explain the construction working principle of the Pelton wheel turbine with a neat sketch. (7 marks, 2026, Hydraulic Turbines)
- What are the Newtonian and Non-Newtonian fluids? (2 marks, 2025, Fluid Properties)
- How does fluid pressure vary with depth? (2 marks, 2025, Fluid Properties)
- What is the difference between gauge pressure and absolute pressure? (2 marks, 2025, Fluid Properties)
- Draw the schematic arrangement of a Pelton wheel turbine and state the applications. (7 marks, 2025, Hydraulic Turbines)
- Compare Pelton Wheel and Francis turbines based on efficiency and applications. (7 marks, 2025, Hydraulic Turbines)
- The space between two square flat parallel plates is filled with oil. Each side of the plate is 60cm. The thickness of the oil film is 12.5mm. The upper plate, which moves at 3 meter per sec, requires a force of 98.1N to maintain the speed. Determine: (i) The dynamic viscosity of the oil in poise, and (ii) The kinematic viscosity of the oil in stokes if the specific gravity of the oil is 0.95. (7 marks, 2025, Fluid Properties)
- Explain how velocity and pressure vary in a fluid system using Bernoulli's principle. (7 marks, 2025, Fluid Properties)
Most asked Unit 4 topics
- Fluid Properties – asked 29 times
- Hydraulic Turbines – asked 16 times
- Hydraulic Pumps – asked 3 times
Unit 4 question pattern
- 2-mark questions: 18 asked in 2021–2026
- 7-mark questions: 21 asked in 2021–2026
- 10-mark questions: 9 asked in 2021–2026
- About 27 marks from Unit 4 in every paper
- 31 questions were asked again in a later year
Unit 4 questions year by year
- 2026: 5 Unit 4 questions asked (25 marks across that year's papers)
- 2025: 9 Unit 4 questions asked (48 marks across that year's papers)
- 2024: 9 Unit 4 questions asked (48 marks across that year's papers)
- 2023: 10 Unit 4 questions asked (50 marks across that year's papers)
- 2022: 11 Unit 4 questions asked (70 marks across that year's papers)
- 2021: 4 Unit 4 questions asked (32 marks across that year's papers)