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02000ME204052002

PART ‏تا‎

Answer any three questions. Each question carries 10 marks
Define dissociation. Discuss the effect of dissociation on power developed by an
Otto cycle with neat sketches.
Discuss the purpose of supercharging with a neat schematic of a supercharged
engine.
Define: (i) Brake power, (ii)Indicated power, (iii) Specific fuel consumption
(iv)Volumetric efficiency and (v) Calorific value
Discuss the effect of dopes and additives on performance of IC engines.
Explain the working of a Stirling engine with the support of thermodynamic cycle
on p-v diagram.
With a neat sketch, explain the method of flue gas analysis using an Orsat
apparatus.
The compression ratio of an engine working on Otto cycle is 6 and A:F ratio of
the mixture is 15. The Calorific value of the fuel used is 44 MJ/kg. The pressure
and temperature of the mixture at the beginning of compression are | bar and
60°C. Determine the maximum pressure in the cylinder if the compression follows
the law ற 171:32 = Constant. Specific heat value is given by,
டி = 0.71 + (0.0002 *7) kJ/kg K, where T is in K.

PART (^

Answer any four questions. Each question carries 10 marks.
Differentiate between knock and pre-ignition.
Write a short note on how Catalytic convertor reduces emission of hydrocarbons
and carbon monoxide.
What are the stages of combustion in a SI engine? Explain with the support of
pressure vs crank angle diagram.
Define highest useful compression ratio (HUCR) and Octane Number for an SI
engine fuel. How it is evaluated?
Explain with a neat sketch, Annular combustion chamber of a gas turbine plant.
Explain the effect of regeneration on gas turbine plant output and efficiency.
Define Swirl, Tumble and Squish. Explain how various types of CI engine
combustion chamber is designed to produce swirl, with suitable diagrams.
Derive an expression for air standard efficiency of a constant pressure gas turbine
cycle in terms of pressure ratio. State your assumptions. Discuss the effect of

pressure ratio on cycle output and efficiency.

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