The unavailable energy is the product of the lowest temperature of hea – McqOptions

MCQOPTIONS

1.	The unavailable energy is the product of the lowest temperature of heat rejection and the change of entropy of system during the process of supplying heat.
A.	true
B.	false
Answer» B. false

Discussion

No Comment Found

Related MCQs

<p>A piston cylinder has 2.5 kg ammonia at -20 C, 50 kPa. It is heated to 50 C at constant pressure from external hot gas at 200 C. Find the total entropy generation.</p>
<p>A hot metal piece is cooled rapidly to 25 C, removing 1000 kJ from the metal. Calculate the change of entropy if energy is absorbed by vaporizing liquid nitrogen at 101.3 kPa pressure.</p>
<p>A hot metal piece is cooled rapidly to 25 C, removing 1000 kJ from the metal. Calculate the change of entropy if energy is absorbed by ice.</p>
<p>A hot metal piece is cooled rapidly to 25 C, removing 1000 kJ from the metal. Calculate the change of entropy if saturated liquid R-22 at 20 C absorbs the energy so that it becomes saturated vapor.</p>
<p>An insulated cylinder/piston contains R-134a at 1 MPa, 50 C, volume of 100 L. The R-134a expands, dropping the pressure in the cylinder to 100 kPa. The R-134a does 190 kJ of work against the piston during this process. Is that possible?</p>
<p>1 kg of air at 300 K is mixed with 1 kg air at 400 K in a constant pressure process at 100 kPa and Q = 0. Find the entropy generation in the process.</p>
<p>It is better to state that the change of state is irreversible, rather than say it is an irreversible process .</p>
<p>Which of the following laws was formulated by Nernst?</p>
<p>A thermodynamic process where no heat is exchanged with the surroundings is</p>
<p>A perfect black body has a unique characteristic feature as</p>