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Reg. No. Name:

B4C122 Pages: 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION, JUNE 2017

ME204: THERMAL ENGINEERING (ME)

Max. Marks: 100 Duration: 3 Hours

PY N

10.

11.

12.
13.

PARTA

Answer any 3 questions. Ten marks each.

Explain the methods of increasing the thermal efficiency of a Rankine cycle.

Compare the characteristic features of a fire tube boiler and water tube boiler.

Discuss the methods of energy transfer in impulse and reaction turbines.

A simple Rankine cycle works between pressure 28 bar and 0.06 bar, the initial

condition of the steam being dry saturated. Calculate the cycle efficiency.

PART 8

Answer any 3 questions. Ten marks each.

Compare a 2 stroke and 4 stroke engines. Which engine do you prefer for two wheelers?
Why?

Define Flash point, Fire point, Calorific value, volatility and carbon residue of a fuel.
Explain the working of a Rotary Engine and Stratified Charge Engine.

Explain turbo charging and super charging. How does it affect the engine performance
and pollution levels? PART C

Answer any 4 questions. Ten marks each.

Show that efficiency of an ideal Stirling cycle is same as that of Carnot cycle, both

operating under same temperature limits.

Compare the Otto cycle and actual cycle with p-v diagram. Explain the effect of variable

specific heats on the performance and efficiency of an Otto Cycle.

Define i. Equivalence Ratio, ii. Mean Effective Pressure, iii. Specific fuel

consumption, iv. Flash Point and v. Time loss factor.

Compare the various stages of combustion in SI and CI engine with 9-0 diagram.
In an engine working on diesel cycle inlet pressure and temperature are 1 bar and 17°C

respectively. Pressure at the end of adiabatic compression is 35 bar. The ratio of