Reg No.:

Max. Marks: 100

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020004 0206052001

Pages: 2

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Fourth semester B.Tech examinations (S), September 2020

Course Code: ‏6ھ‎
‎Course Name: PROPULSION I (AN)

PARTA

Answer any three full questions, each carries 10 marks
Write a short note on the classification of piston engines. Mention at least 4
types of classification.
Explain the ideal momentum theory of propellers and derive an expression for
the efficiency of a propeller.
Explain the working of a turbojet engine with the help of a schematic diagram
and also derive the expression for the thrust developed.
Derive the relation between minimum area ratio and external deceleration ratio
in a subsonic inlet.
What is frozen flow and equilibrium flow with respect to flow in nozzles?
Discuss the concept of flame stabilization in combustion chambers.

PART ‏تا‎

Answer any three full questions, each carries 10 marks
Discuss the performance characteristics of a single stage axial flow compressor.
An axial compressor stage has the following data:
Temperature and pressure at entry= 300 K and 1.0 bar
Degree of reaction =50%
Mean blade ring diameter= 36 cm
Rotational speed = 18000 rpm
Blade height at entry= 6 cm
Air angles at rotor and stator exit = 25°
Axial velocity= 180 m/s
Work-done factor = 0.88
Stage efficiency= 85%
Mechanical efficiency= 96.7%.

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Duration: 3 Hours

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