Turbomachinery important questionsMost repeated in SPPU papers
These 22 questions appeared in more than one SPPU Turbomachinery paper we have: 7 papers, from Nov 2022 to Nov 2025. The most-asked come first. Each one links to the papers it was asked in.
Repeated questions
Endsem questions (22)
- 5×asked
The external and internal diameters of an inward flow reaction turbine are 2m and 1m respectively. The head on the turbine is 60 m. The width of the vane at inlet and outlet are the same and equal to 0.25 m. The runner vanes are radial at inlet and discharge is radial at outlet. The speed is 200 rpm and the discharge is 6 m 3 /sec. Determine (i) The vane angle at outlet of the runner and guide blade angle at inlet. (ii) The hydraulic efficiency.
- 4×asked
A Centrifugal pump having outer diameter equal to two times inner diameter and running at 1200 rpm works against a total head of 75m. The velocity of flow through the impeller is constant and is equal to 3 m/s. The vanes are set back at width at an angle of 30° is at the outlet. If the outer diameter of the impeller is 600 mm and width at outlet is 50 mm. Determine: i) Vane angle at inlet ii) Work done per second by impeller iii) Manometric efficiency 3
- 4×asked
- 4×asked
- 3×asked
- 3×asked
- 3×asked
A Centrifugal pump running at 900 rpm is working against a head 20m. The external diameter of the impeller is 460 mm and outlet width is 50 mm. If the vane angle at outlet is 40° and manometric efficiency is 70 %. Determine the following i) Flow velocity at outlet ii) Angle made by the absolute at outlet with the direction of motion at outlet
- 3×asked
Steam enters an impulse wheel having a nozzle angle of 20° at a velocity of 450 m/s. The exit angle of moving blades is 20° and relative velocity of steam may be assumed to remain constant over the moving blades. If the blade speed is 180 m/s. determine: i) blade angle at inlet, ii) work done/kg of steam, iii) power developed when the turbine is supplied with 1.8 kg/s of steam iv) Diagram efficiency
- 3×asked
The impeller of the centrifugal compressor has the inlet and outlet diameter of 0.3 and 0.6 m respectively. The intake is from the atmosphere at 100 kPa and 300 K, without any whirl component. The outlet blade speed is 10000 rpm and velocity of flow is constant at 120 m/s. If the blade width at inlet is 6 cm outlet Blade Angle = 75º Calculate i) Specific work ii) Exit pressure
- 3×asked
- 3×asked
- 2×asked
- 2×asked
- 2×asked
- 2×asked
- 2×asked
- 2×asked
- 2×asked
The outer diameter of an impeller of a centrifugal pump is 400mm and outlet width is 50mm. The pump is running at 800 rpm and is working against a total head of 15 m. The vane angle at outlet is 40° and manometric efficiency is 75% Determine i) Velocity of flow at outlet iii) Velocity of water leaving the vane iii) Angle made by absolute velocity at outlet 3
- 2×asked
- 2×asked
- 2×asked
Following data refer to the single row of impulse steam turbine mean diameter of the blade ring = 1.1 m, Speed = 3000rpm, Nozzle angle = 17 deg., ratio of blade velocity to the steam velocity = 0.45, blade friction factor = 0.82, Blade angle at exit is less by 3 deg to that at inlet, steam mass flow rate = 10.2 kg/s. Draw a velocity diagram and find the following: i) Blade angles at inlet and outlet ii) Tangential force iii) Axial force iv) Power developed.
- 2×asked
Questions count as repeated when their wording matches closely across papers. Numericals that depend on a figure are left out, since the figure changes from paper to paper.