# Mechanical Engineering - Thermodynamics - Discussion

### Discussion :: Thermodynamics - Section 4 (Q.No.45)

45.

A process, in which the gas is heated or expanded in such a way that product of its pressure and volume remains constant, is called isothermal process.

 [A]. Yes [B]. No

Explanation:

No answer description available for this question.

 Vishal Gaurav said: (Mar 12, 2013) A/c to Boyle's law P is inversely proportional to V when temp remains constant.

 Manoj said: (Aug 29, 2014) Yes @Vishal pv=c at const. temperature A/c to Boyle's law.

 Indra said: (Oct 18, 2014) Yes pv=c at constant temp.

 Bharat said: (Mar 4, 2015) Why is this false in isothermal process pv is constant right?

 Alb said: (Mar 31, 2015) Process is given as heated that means there will be change in temperature. So it must be hyperbolic process.

 Vishal said: (Jul 30, 2015) Hyperbolic process is also called isothermal process.

 Anil said: (Nov 25, 2015) Hyperbolic process is called isochoric process.

 Vishal Joshi said: (Jul 9, 2016) It is the isothermal process. And isothermal process is hyperbolic one.

 Sathaiah Chitikesi said: (Aug 10, 2016) In the gas law, PV = mRT, for a given gas m and are constant. The product of P and V is constant when T is constant. Thus isothermal process (for gas only) is the correct answer. It is not known why the answer was given is B (ie. NO).

 Vanraj Gajarotar said: (Aug 22, 2016) In gas PV = constant. It is an isothermal process and in steam, PV = constant in the wet region is a hyperbolic process and superheated state is the isothermal process. Therefore right answer is "A".

 Jay Patel said: (Dec 12, 2016) It may be noted that the hyperbolic process is governed by Boyle, s law i.e. p we = constant. If we plot a graph of pressure and volume, during the process as shown in fig we shall get a rectangular hyperbola. Hence, this process is termed as a hyperbolic process. It is merely a theoretical case and has a little importance from the subject point of view. Its practical application is an isothermal process.

 M.T.Naidu said: (Dec 24, 2016) In an isothermal process, the product of pressure and volume is constant, hence correct option is yes.

 Rathod said: (Jan 5, 2017) According to me, Correct answer must be yes.

 Sateesh said: (Jun 10, 2017) The correct answer is A, Yes.

 S Bera said: (Jun 28, 2017) Correct answer is A.

 Habeeb Rahman said: (Aug 22, 2017) 1. Hyperbolic Process- it is the process where the gas is heated or expanded in such a way that the product of its pressure and volume remains constant. This process is governed by Boyle's law. Mathematically, p * v = constant 2. Isothermal Process- it is the process in which the temperature of the working substance remains constant during expansion or compression. In an isothermal process, there is no change in temperature and internal energy.

 Niranjan Das said: (May 9, 2018) I think the isothermal process is the right answer. But If hyperbolic process are available then then we choose hyprobalic process right.

 Mistri said: (Aug 1, 2018) Heating does not signify the increase in temp.

 Comiefa said: (May 24, 2020) Its only correct for ideal gases not for all gases