Turbomachinery (ME-603 (A)) - Important Questions

Derive the moment of momentum equation and Euler's turbine energy equation for turbomachines and give the expression for power and energy transfer.

Explain the term degree of reaction in turbomachinery with reference to steam turbines, including 50% reaction turbine.

Explain velocity compounding and pressure compounding in steam turbines with neat sketches.

For a single-stage impulse turbine, draw inlet and outlet velocity triangles and calculate blade angles, whirl components, tangential and axial thrust, power developed and blading/diagram efficiency. Steam velocity 600 m/s, blade speed 250 m/s, nozzle angle 20 degrees, blade outlet angle 25 degrees, neglecting friction.

What is the reheat factor in multi-stage steam turbines and why does it give higher efficiency than a single stage with the same stage efficiency?

Derive the condition for maximum efficiency (blade speed ratio) of a reaction turbine stage.

Explain the advantages of centrifugal pumps over reciprocating pumps.

A Pelton wheel has a mean bucket speed of 10 m/s with a jet of water flowing at the rate of 700 litres/s under a head of 30 m. The buckets deflect the jet through an angle of 160 degrees. Calculate the power imparted to the runner and the hydraulic efficiency.

Define and explain the various efficiencies - hydraulic, mechanical, volumetric and overall - of a hydraulic turbine.

Differentiate between centrifugal flow compressor and axial flow compressor.

State and explain the Fan Laws and discuss their engineering applications for fans, blowers and compressors.

Explain the construction and working principle of a torque converter with the help of a neat diagram.

Write down the applications of power transmitting devices - fluid coupling, torque converter and hydrostatic systems - at industry level.