Question

Which statement can be attributed to the 2nd Law of Thermodynamics?

a		For any real process, energy is conserved.
b		For any real process, entropy is conserved.
c		Energy flow has a direction.
d		Energy has a magnitude.

Entropy change across a pump used in a certain practical application was found out to have a negative value. Which of the below statement is true?

	a	The entropy generation across the pump is negative.
	b	There is heat loss from the pump to the surrounding.
	c	There is work output from the pump.
	d	All of the above are true.

An irreversible turbine has a negative change in entropy, which means

	a	The entropy generation across the turbine is negative.
	b	There is heat loss from the turbine to the surrounding.
	c	There is negative work output from the turbine
	d	All of the above are true

An actual turbine undergoes an adiabatic process generating entropy due to irreversibilities. The generated entropy

a		causes the turbine’s exit temperature to be lower than if the turbine were reversible.
b		causes the turbine’s exit temperature to be higher than if the turbine were reversible.
c		causes the turbine’s exit pressure to be lower than if the turbine were reversible.
d		causes the turbine’s exit pressure to be higher than if the turbine were reversible.

Answer 1

① The and law of thermodynamics has attributed that (c) Energy flow has a direction (Any) ( If As =-he value hore pump + As gen Asgen ee As system = ta always the so bere AS system to be negative do must be negative and da will be negative when there is heat loss from the pump (6) There is heat loss breum the pump to the sorrounding. T

+ Asgen T generated entropy causes to be lower than it the turbine were relvensible. cho causes the turbine's exit temperature As turbine then As system de Asgen i always the so for As system to be negative do must be negative and it will be negative when there is heat lose from the pump turbine Tact Ts highen (b) There i heat loss from the turbine to the surroundling Answer V 1 Irreversible reven Ας Track 75 Si=Sas actual derbine undergoa on adliabatic prescens