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020004 0206052001

Determine:
i) Air angles at the rotor and stator entry.
ii) Mass flow rate of air

111) Power required to drive the compressor

iv) Stage loading coefficient

೪) Pressure ratio developed by the stage.
Explain the principle of operation of a centrifugal compressor with the help of a
neat sketch.
Explain the phenomenon of slip in a centrifugal compressor.
Derive an expression for the degree of reaction of a centrifugal compressor.
Why is pre-whirl required in a centrifugal compressor?

PART C
Answer any four full questions, each carries 10 marks
With the aid of a schematic diagram, explain the principle of operation of axial
flow turbines.
Define: (i) blade loading coefficient and
(ii) stage loading coefficient with respect to axial flow turbines

Derive an expression for the degree of reaction of an axial turbine. Also derive
an expression for a 50% reaction turbine.
Explain clearly how the matching of compressor and turbine is carried out.
With a schematic, explain the operating principle of a ramjet engine.
How are ramjets different from turbojets? Explain at least 2 major points of
comparison.
Explain the different modes of operation of a ramjet engine.
Give a brief on the working of a turboprop engine.

Explain the working of an integral ram rocket.

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