# 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 1 of 4.

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.

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 .

Guru vk said:   8 years ago
It's a diesel cycle as it consists one const pressure where heat is supplied, one const volume where heat is removed ie cooling and two isentropic processes. One is for expansion, another one is for compression. It is also known as const pressure cycle.

Sumit kumar said:   10 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.

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.

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).

Manan pandya said:   8 years ago
Diesel cycle

In process: a-b_constant temperature heat addition.
Process : c-d_constant temperature heat rejection.

KIRAN PAWAR said:   8 years ago
In diesel cycle process 0-1 its sanction.

1-2 isentropic comp.
3-4 isentropic expansion.
4-1 constant volume heat rejection.
1-0 exhaust stroke.

SPP said:   5 years ago
There are four processes in diesel cycle as follows:

1. Isentropic compression.