Mechanical Engineering - Thermodynamics - Discussion

2. 

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

[A]. Carnot cycle
[B]. Stirling cycle
[C]. Otto cycle
[D]. Diesel cycle

Answer: Option D

Explanation:

No answer description available for this question.

Pabitra Mandal said: (Mar 17, 2013)  
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 .

Loki said: (Jun 13, 2013)  
Actually it should be duel cycle diesel do not have both constant pressure and constant volume both only constant pressure.

Vipul said: (Aug 9, 2013)  
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.

Dinesh Kumar Kumawat said: (Sep 20, 2013)  
Please correction vipul that work is not obtain at const vol but in adiabatic expansion process.

K Sushma Reddy said: (Jan 23, 2014)  
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).

K Y Nagendra said: (Nov 18, 2014)  
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 S Prithiviraj said: (Nov 22, 2014)  
Higher efficiency that cannot engine isotropic compressor and isothermal expansion but it not satisfied to nowadays so diesel engine was used.

Sumit Kumar said: (Nov 24, 2014)  
Obviously answer is D.

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.

Biswabhusan Rath said: (Mar 7, 2015)  
Otto cycle have two constant volume diesel cycle have one one constant volume and one constant pressure possess.

Parthikkumar Patel said: (Jul 26, 2015)  
Actually its dual cycle.

Ananthan said: (Sep 15, 2015)  
It is diesel cycle because it has one constant volume and pressure process.

Yogesh Gayake said: (Jan 20, 2016)  
Its right its diesel cycle because it consisting of two isentropic process & also consisting of constant volume & pressure process.

Parmeshwar Nishad said: (Jan 22, 2016)  
Answer is diesel cycle because it consist 1 constant volume. And constant pressure and two isentropic process.

Kiran Pawar said: (May 27, 2016)  
In diesel cycle process 0-1 its sanction.

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

Karuppasmy said: (Jul 2, 2016)  
2-3, heat addition is constant pressure.

4-1 heat rejection is constant volume.

IN DIESEL CYCLE.

Saumashankar Bala said: (Jul 24, 2016)  
As per my knowledge, it is Dual cycle.

Raju said: (Aug 3, 2016)  
Can you explain how?

Rajan said: (Sep 26, 2016)  
As per my knowledge, it is an ericsson cycle.

Abhishek Kumar Singh said: (Oct 2, 2016)  
I am sure this is a dual cycle because one constant pressure and one constant. Volume did in dual and name also gives a reason.

Manan Pandya said: (Oct 3, 2016)  
Diesel cycle

In process: a-b_constant temperature heat addition.
Process: b-c_rev.adiabatic expansion.
Process : c-d_constant temperature heat rejection.
Process: d-a_rev.adiabatic compression pressure.

Somashekhara K said: (Oct 4, 2016)  
The answer should be a dual cycle.

Manivannan said: (Oct 14, 2016)  
The answer should be a diesel cycle because in dual cycle two constant volume and one constant pressure process.

Shivram Sahu said: (Oct 16, 2016)  
What is a cycle?

Guru Vk said: (Nov 4, 2016)  
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.

Ppkamaliya said: (Jan 3, 2017)  
Carnot cycle also called.

1. Constant entropy cycle.
2. Constant heat cycle.

Ppkamaliya said: (Jan 3, 2017)  
Carnot cycle also called.

1. Constant entropy cycle.
2. Constant heat cycle.

Bahubali said: (Aug 17, 2017)  
Answer : D is correct.

Sathish said: (Aug 29, 2017)  
It is a diesel cycle.

Guest said: (Sep 18, 2017)  
Please explain this cycle fluently with reasonable real example.

Akash L said: (Nov 6, 2017)  
Its dual cycle. Dual cycle has 2 isentropic process, a partial constant volume and a partial constant pressure cycle.

Naveen Pandi said: (Jul 11, 2018)  
It's a dual cycle because, As the name implies it is a combination of Otto and Diesel cycles. So it consists of 1 isochoric, 1 isobaric and 2 isentropic processes.

Mahesh said: (Jul 24, 2018)  
The correct answer is diesel cycle. I agree with the given answer.

Simon .K said: (Oct 5, 2018)  
It's D) Diesel cycle.

Spp said: (Feb 12, 2019)  
There are four processes in diesel cycle as follows:

1. Isentropic compression.
2. Constant pressure heat addition.
3. Isentropic expansion.
4. Constant volume of heat rejection.

Nitin said: (Apr 17, 2019)  
Yes, in a diesel cycle heat addition is happened at constant pressure.
And fur gases axhausts at constant volume.

Correct answer is diesel cycle.

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