AKTU Fluid Mechanics · Important Questions 2026Source: ryzenstudy.com PYQs
BCE303 Fluid Mechanics Important Questions 2026 (AKTU)
Repeat analysis + most-asked questions, unit-wise
What we did: built from all 3 AKTU Fluid Mechanics papers (2021-22–2023-24): 71 questions grouped into 58 distinct questions, 10 of which were asked in more than one paper.
- of marks were repeat questions
- —
- of marks were repeat questions
- questions asked in 2+ papers
- 10
- questions asked in 2+ papers
- papers analysed (2021-22–2023-24)
- 3
- papers analysed (2021-22–2023-24)
- units, mapped to current syllabus
- 5
- units, mapped to current syllabus
How much of the paper repeats?
- Not enough papers yet to measure this for this subject.
Across 10 subjects and 23 papers we tested, 43% of marks repeated earlier questions on average.
1.Unit-wise most-asked questions
Ranked by how many papers asked them, then by how recently. Click a paper to open it.
Unit 1:
22% of past marks| Question | Asked |
|---|---|
| Determine the total pressure on a circular plate of diameter 1.5 m which is placed vertically in water in such a way that the centre of the plate is 3 m below the free surface of water. Find the position of the centre of pressure also. | Asked 2× |
| Calculate the density, specific weight, and weight of one litre of petrol of specific gravity 0.7. | Asked 2× |
| What do you mean by a single column manometer? How is it used for the measurement of pressure? 7 marks2023-24 Q2(a) | Asked 1× |
| How will you determine the metacentric height of a floating body experimentally? Explain with a neat sketch. 7 marks2023-24 Q3(b) | Asked 1× |
Unit 2: Types of fluid flows
27% of past marks| Question | Asked |
|---|---|
| The following equations represent two velocity components (see original paper). Determine the third component of velocity such that it satisfies the continuity equation. | Asked 2× |
| Write the assumptions of the continuity equation. Derive the continuity equation. | Asked 2× |
| The stream function for a two-dimensional flow is given by psi = 2xy. Calculate the velocity at the point P (2, 3). Find the velocity potential phi. | Asked 2× |
| Describe the method of determination of the stream function given the velocity relationship and also determine the stream function given u = 4xy and v = c - 2y^2. | Asked 2× |
Unit 3: Potential Flow
20% of past marks| Question | Asked |
|---|---|
| An orifice meter with orifice diameter 10 cm is inserted in a pipe of 20 cm diameter. The pressure gauges fitted upstream and downstream of the orifice meter give readings of 19.62 N/cm2 and 9.81 N/cm2 respectively. The coefficient of discharge for the orifice meter is 0.6. Find the discharge of water through the pipe. | Asked 2× |
| Draw a neat sketch of a venturimeter showing its parts. Find the expression for the rate of flow through a venturimeter. 7 marks2023-24 Q2(d) | Asked 1× |
| Show that the loss of head due to sudden expansion in a pipeline is a function of velocity head. 7 marks2023-24 Q5(b) | Asked 1× |
| Write the names of the forces present in fluid flow. 2 marks2023-24 Q1(f) | Asked 1× |
Unit 4:
12% of past marks| Question | Asked |
|---|---|
| Find the expression for the drag on a sphere when the Reynolds number of the flow is (value missing, see original paper). | Asked 2× |
| Determine the distance from the pipe wall at which the local velocity is equal to the average velocity for turbulent flow in a pipe. (Row also holds a laminar boundary layer problem: find the boundary layer thickness and shear stress 1.5 m from the leading edge of a plate 2 m long and 1.4 m wide in water moving at 200 mm/s, and total drag force with mu = 0.1 poise; velocity profile missing, see original paper.) 7 marks2023-24 Q6(a) | Asked 1× |
| Fluid is in laminar motion between two parallel plates under the action of motion of one of the plates and also under the presence of a pressure gradient in such a way that the net forward discharge across any section is zero. (i) Find the point where minimum velocity occurs and its magnitude. (ii) Draw the velocity distribution graph across the section. 10 marks2022-23 Q2(d) | Asked 1× |
| In a pipe of 300 mm diameter the maximum velocity of flow is found to be 2 m/s. If the flow in the pipe is laminar find: (i) The average velocity and the radius at which it occurs (ii) The velocity at 50 mm from the wall of the pipe. 10 marks2022-23 Q7(b) | Asked 1× |
Unit 5:
20% of past marks| Question | Asked |
|---|---|
| The efficiency eta of a fan depends on density rho, dynamic viscosity mu of the fluid, angular velocity omega, diameter of the rotor D and the discharge Q. Express eta in terms of dimensionless parameters by Buckingham's pi-theorem. | Asked 3× |
| In a 1 in 20 model of a stilling basin, the hydraulic jump in the model is observed to be 0.20 m. What is the height of the hydraulic jump in the prototype? If the energy dissipated in the model is 1/10 kW, what is the corresponding value in the prototype? | Asked 2× |
| What do you know about model analysis? 2 marks2023-24 Q1(g) | Asked 1× |
| Give the names of four important dimensionless numbers in fluid mechanics. 2 marks2022-23 Q1(j) | Asked 1× |
2.Topic weightage: which topics carry the marks
Blue = Tier 1 + Tier 2 (topics that carried ~80% of past marks). Grey = the rest. It shows where marks have gone, not a promise of what comes next.
Pitot, orifice and venturi meters · U3
9.2% (cum 9%)
Stream function and velocity potential · U2
9.1% (cum 18%)
Continuity equation · U2
7.8% (cum 26%)
Dimensional analysis, Pi theorem · U5
6% (cum 32%)
Drag and lift · U5
6% (cum 38%)
Buoyancy and stability · U1
5.9% (cum 44%)
Pressure on surfaces, centre of pressure · U1
5.3% (cum 49%)
Laminar flow and Stokes law · U4
5.3% (cum 55%)
Model studies · U5
4.9% (cum 59%)
Types of fluid flows · U2
4.7% (cum 64%)
Pipe resistance and minor losses · U3
4.3% (cum 68%)
Mixing length, turbulent velocity · U4
3.6% (cum 72%)
Pressure-height relationship · U1
3.5% (cum 76%)
Euler and Bernoulli equations · U3
3.5% (cum 79%)
Compressible and sonic flow · U2
3.3% (cum 82%)
Manometers and pressure measurement · U1
2.9% (cum 85%)
Similarity laws · U5
2.4% (cum 88%)
Physical properties of fluids · U1
2.4% (cum 90%)
Pipes in series, parallel, siphon · U3
2.4% (cum 93%)
Boundary layer thickness · U4
2.2% (cum 95%)
Streamlines, path and streak lines · U2
1.7% (cum 96%)
Fluid and continuum · U1
1% (cum 97%)
Rheology of fluids · U1
0.7% (cum 98%)
Source, sink and doublet · U3
0.7% (cum 99%)
Laminar and turbulent boundary layer · U4
0.7% (cum 100%)
Dimensionless numbers · U5
0.7% (cum 100%)
| Topic | Papers | Share |
|---|---|---|
| Pitot, orifice and venturi meters · Unit 3 · Tier 1 | 3/3 | 9.2% |
| Stream function and velocity potential · Unit 2 · Tier 1 | 3/3 | 9.1% |
| Continuity equation · Unit 2 · Tier 1 | 3/3 | 7.8% |
| Dimensional analysis, Pi theorem · Unit 5 · Tier 1 | 3/3 | 6% |
| Drag and lift · Unit 5 · Tier 1 | 2/3 | 6% |
| Buoyancy and stability · Unit 1 · Tier 1 | 3/3 | 5.9% |
| Pressure on surfaces, centre of pressure · Unit 1 · Tier 1 | 2/3 | 5.3% |
| Laminar flow and Stokes law · Unit 4 · Tier 1 | 1/3 | 5.3% |
| Model studies · Unit 5 · Tier 2 | 2/3 | 4.9% |
| Types of fluid flows · Unit 2 · Tier 2 | 3/3 | 4.7% |
| Pipe resistance and minor losses · Unit 3 · Tier 2 | 2/3 | 4.3% |
| Mixing length, turbulent velocity · Unit 4 · Tier 2 | 2/3 | 3.6% |
| Pressure-height relationship · Unit 1 · Tier 2 | 2/3 | 3.5% |
| Euler and Bernoulli equations · Unit 3 · Tier 2 | 3/3 | 3.5% |
| Compressible and sonic flow · Unit 2 · Tier 2 | 1/3 | 3.3% |
| Manometers and pressure measurement · Unit 1 · Tier 3 | 2/3 | 2.9% |
| Similarity laws · Unit 5 · Tier 3 | 2/3 | 2.4% |
| Physical properties of fluids · Unit 1 · Tier 3 | 2/3 | 2.4% |
| Pipes in series, parallel, siphon · Unit 3 · Tier 3 | 2/3 | 2.4% |
| Boundary layer thickness · Unit 4 · Tier 3 | 1/3 | 2.2% |
| Streamlines, path and streak lines · Unit 2 · Tier 3 | 2/3 | 1.7% |
| Fluid and continuum · Unit 1 · Tier 3 | 1/3 | 1% |
| Rheology of fluids · Unit 1 · Tier 3 | 1/3 | 0.7% |
| Source, sink and doublet · Unit 3 · Tier 3 | 1/3 | 0.7% |
| Laminar and turbulent boundary layer · Unit 4 · Tier 3 | 1/3 | 0.7% |
| Dimensionless numbers · Unit 5 · Tier 3 | 1/3 | 0.7% |
3.Paper pattern (2023-24)
| Section | Questions | Rule |
|---|---|---|
| A | 7 × 2 marks | Attempt all |
| B | 5 × 7 marks | Attempt any 3 |
| C | 9 × 7 marks | Attempt any 1 |
4.In the syllabus, never asked yet
Low priority, but read them once — a new paper can always start here.
- Notches and weirs · U3
- Momentum equation, pipe bends · U3
- Power transmission, water hammer · U3
- Momentum equation application · U4
- Introduction to CFD · U5
5.Study order
- 1Pitot, orifice and venturi meters (Unit 3, Tier 1)
- 2Stream function and velocity potential (Unit 2, Tier 1)
- 3Continuity equation (Unit 2, Tier 1)
- 4Dimensional analysis, Pi theorem (Unit 5, Tier 1)
- 5Drag and lift (Unit 5, Tier 1)
- 6Buoyancy and stability (Unit 1, Tier 1)
- 7Pressure on surfaces, centre of pressure (Unit 1, Tier 1)
- 8Laminar flow and Stokes law (Unit 4, Tier 1)
- 9Model studies (Unit 5, Tier 2)
- 10Types of fluid flows (Unit 2, Tier 2)
- 11Pipe resistance and minor losses (Unit 3, Tier 2)
- 12Mixing length, turbulent velocity (Unit 4, Tier 2)
- 13Pressure-height relationship (Unit 1, Tier 2)
- 14Euler and Bernoulli equations (Unit 3, Tier 2)
- 15Compressible and sonic flow (Unit 2, Tier 2)
FAQ
Which units of BCE303 carry the most marks?
Unit 2 (Types of fluid flows, 27% of past marks) and Unit 1 (, 22% of past marks).
Do AKTU Fluid Mechanics questions repeat?
10 questions have appeared in more than one of the 3 papers so far. There are not enough papers yet to measure the repeat share reliably.
How is this list made?
Every question from the 3 papers (2021-22–2023-24) was mapped to the current AKTU syllabus and grouped with the same question from other years. Questions are ranked by how many papers they appeared in, then by how recently.
Study this subject
Note: this is based on past AKTU papers, not a guarantee. Questions are mapped to the current syllabus; topics that are no longer in the syllabus are left out.