# Mechanical Engineering - Thermodynamics - Discussion

Discussion Forum : Thermodynamics - Section 1 (Q.No. 2)
2.
A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
Carnot cycle
Stirling cycle
Otto cycle
Diesel cycle
Explanation:
No answer description is available. Let's discuss.
Discussion:
40 comments Page 4 of 4.

Parthikkumar patel said:   9 years ago
Actually its dual cycle.

BISWABHUSAN RATH said:   9 years ago
Otto cycle have two constant volume diesel cycle have one one constant volume and one constant pressure possess.

Sumit kumar said:   9 years ago

As in diesel cycle one is cost. Pressure and one is cons. Volume 2 process are adiabatically compression and expansion (because all practical cycle are reversible) and in reversible cycle adiabatic = isotropic process.

K s prithiviraj said:   10 years ago
Higher efficiency that cannot engine isotropic compressor and isothermal expansion but it not satisfied to nowadays so diesel engine was used.

K Y NAGENDRA said:   10 years ago
Process 1 to 2 is isentropic compression of the fluid (blue). cp/cv = 1.4.

Process 2 to 3 is reversible constant pressure heating (red). w = 0.

Process 3 to 4 is isentropic expansion (yellow). cp/cv = 1.4.

Process 4 to 1 is reversible constant volume cooling (green).

Actually it's dual cycle because Otto cycle only constant volume cycle & diesel cycle is constant process cycle. So the answer is dual cycle.

K sushma reddy said:   1 decade ago
Process 1 to 2 is isentropic compression of the fluid (blue).
Process 2 to 3 is reversible constant pressure heating (red).
Process 3 to 4 is isentropic expansion (yellow).
Process 4 to 1 is reversible constant volume cooling (green).

Dinesh kumar kumawat said:   1 decade ago
Please correction vipul that work is not obtain at const vol but in adiabatic expansion process.

Its. Diesel cycle. Because in diesel cycle heat is supplied to the system at constant pressure. but heat rejected or work obtained at constant volume process. And rather than the two process. I reversible isentropic process is also there.

Actually it should be duel cycle diesel do not have both constant pressure and constant volume both only constant pressure.

Pabitra Mandal said:   1 decade ago
Its diesel cycle because in,

[A] Carnot cycle it consists of two isothermal and two reverseable adiabatic processes.

[B] Stirling cycle it consists of two isothermal and two constant volume processes.

[c] Otto cycle it consists of two constant volume and two isentropic processes .