Question regarding Heat Transfer in Carnot Engine

[Harikesh_33]

***A Carnot Engine*** is a theoretical engine unlike a Sterling Engine which can be made practically.

Some of the drawbacks of Carnot Engine are,

1)The Heat Transfer occurs only during isothermal process(compression and expansion),this is because the working material (ie) gas or fuel used, if it's at a different temperature(technically the temperature of the working material is infinitesimally smaller)than the hot reservoir ,then some amount of heat get's used up to attain thermal equilibrium (ie) it's irreversibly lost .

Now my question is ,if ##Q_H## is the heat supplied by the #Heat# #Reservoir# ,then the heat is used to do some work of say ##dW=pdV## and if entire heat ##Q_H## gets used as Work, then how does it transfer ##Q_c## amount of heat to the cold reservoir?

And it seems so odd to say that once the Isothermal processes are over ,it expands /contracts adiabatically ,are we physically removing the sources here ? **Is the only use of Adiabatic process in ***"Imaginary Carnot Cycle"*** to produce a proper cycle**?

 

[jack action]

Now my question is ,if ##Q_H## is the heat supplied by the #Heat# #Reservoir# ,then the heat is used to do some work of say ##dW=pdV## and if entire heat ##Q_H## gets used as Work, then how does it transfer ##Q_c## amount of heat to the cold reservoir?

The amount of work is ##Q_H - Q_C##, not just ##Q_H##.

are we physically removing the sources here ? **Is the only use of Adiabatic process in ***"Imaginary Carnot Cycle"*** to produce a proper cycle**?

Yes, you are shutting down the heat transfer process, Something similar to closing a valve to shut down a mass flow. Something very difficult to achieve physically, most likely impossible at high speed.