GAS POWER CYCLES
1. Write a short note on –
a. Compression ratio
b. Cut off ratio in Diesel Cycle
c. Dual cycle
d. Aircraft propulsion.
2. Derive an expression for thermal efficiency , net work done & Mean effective
pressure (MEP) for Otto Cycle with P-V & T-S diagram.
3. Derive an expression for thermal efficiency & net work done for Diesel Cycle with
P-V & T-S diagram.
4. Explain with P-V & T-S diagrams the following cycles –
a. Stirling cycle
b. Carnot cycle
c. Diesel cycle
d. Otto cycle
5. For a given compression ratio, Diesel cycle is less efficient than otto cycle .Explain
using P-V & T-S diagram.
OR
At the same compression ratio, which engine cycle is more efficient among Otto,
Diesel or dual cycle? Explain using P-V & T-S diagram.
6. An engine working on a diesel cycle has a compression ratio of 12 & an expansion
ratio of 6. If the air at the suction has a temperature of 300 K. Calculate the
efficiency & work output of the cycle.
7. A certain quantity of air at a pressure of 1 bar & a temperature of 70 degree Celsius
is compressed reversibly & adiabatically until the pressure is 7 bar in an Otto cycle
engine. 460 KJ of heat per kg of air is now added at constant volume. Calculate:
a) Compression ratio
b) Temperature at the end of compression
