P. 1) The working substance of Cannot cycle is air considered as a perfect gas. Maximum pressure in the cycle is 21 bar and temperature 277°C. The ratio of Isothermal expansions 2 and of isentropic Compression is 5. At the beginning of Isothermal expansion the volume is 0.3m³. Determine (1) Minimum temperature in cycle. (ii) The change of entropy during the Isothermal process (iii) Heat added to the cycle
P. 1) The working substance of Cannot cycle is air considered as a perfect gas. Maximum pressure in the cycle is 21 bar and temperature 277°C. The ratio of Isothermal expansions 2 and of isentropic Compression is 5. At the beginning of Isothermal expansion the volume is 0.3m³. Determine (1) Minimum temperature in cycle. (ii) The change of entropy during the Isothermal process (iii) Heat added to the cycle
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Problems o...Diesel Cycle
Problems on Carnot cycle, Otto cycle, Diesel cycle
P. 1) The working substance of Cannot cycle is air considered as a perfect gas. Maximum
pressure in the cycle is 21 bar and temperature 277°C. The ratio of Isothermal expansions 2 and
of isentropic Compression is 5. At the beginning of Isothermal expansion the volume is 0.3m³.
Determine
(1) Minimum temperature in cycle.
(ii) The change of entropy during the Isothermal process
(iii) Heat added to the cycle
(iv) Heat rejected in the cycle
(v) Power developed with 100 cycles completed per minute
(vi) Thermal efficiency of the cycle.
(Vii) Mean effective pressure developed
2) A Carnot Engine working b/w 377°c and 37°c produce 120 kJ of work Determine
(1) Heat added in KJ
(2) Entropy change during Heat rejection process
(3) Engine thermal efficiency
3) The Peak Pressure in an Otto cycle is 21 bar. With a Compression ratio of 5, and the
minimum pressure of I bar, determine (1) Thermal efficiency (2) mean effective Pressure.
Assume the working Substance as air with y=1.4.
4) An air engine working on the otto cycle has the Compression ratio raised from 5 to 6.
Compare the change in efficiency due to this rise. Assume y=1.4
5) Calculate the thermal efficiency of an engine working on the otto cycle. The bore & Stroke of
the cylinder are 17 cm and 30cm respectively. The clearance volume is 0.25m³. Assume y=1.4
6) An engine working on the otto cycle has a Suction pressure of 1bar and a pressure of 13.5
bar at the end of Compression. For the cold air standard with y=1.4 find (i) the Compression
ratio (2) percentage clearance (3) Thermal efficiency (4) if the Initial temperature is 27°c, find
the temperature at the end of Compression (5) if the Pressure at the end of combustion is 23
bar, what is the mean effective pressure?
7) The Ideal otto engine working on the air standard has a temperature and pressure at the
beginning as 25°c and 1bar respectively, and a thermal efficiency of 48%. Determine the
pressure and temperature at the end of the Compression
8) The mean effective pressure of an ideal diesel cycle is 75bar. If the initial pressure is 1bar
and the compression ratio is 12.5, determine the constant pressure cut off ratio. Assume r=1.4
9) An Ideal diesel cycle operates on 1kg of Standard air with an initial pressure of 0.98 bar and a
temperature of 35C. The pressure at the end of compression is 33bar and the cutoff is 6% of
the stroke. Determine (1) The compression ratio (2) The percentage clearance (3) The heat
supplied (4) heat rejected (5) Thermal efficiency (6) mean effective pressure
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