MCQs of Exergy (Engineering Thermodynamics - 3131905)

Engineering Thermodynamics (3131905) MCQs

MCQs of Exergy

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The availability (A) of a given system is defined as the ____ work that is obtainable in a process in which system comes to equilibrium with its surroundings.

(a)	useful work
(b)	maximum useful work
(c)	minimum useful work
(d)	none of the mentioned

The maximum amount of useful work that can be obtained from a system as it undergoes a process between two specified states is called

(a)	adiabatic work
(b)	reversible work
(c)	irreversible work
(d)	none of the mentioned

Availability depends on the

(a)	state of both the system and surroundings
(b)	state of the system only
(c)	state of the surroundings
(d)	none of these

Availability function for a closed system is given by

(a)	$U - P_{0} V + T_{0} S$
(b)	$U + P_{0} V + T_{0} S$
(c)	$U - P_{0} V - T_{0} S$
(d)	$U + P_{0} V - T_{0} S$

If the final state of the system is the dead state, the ____ and the ____ become identical.

(a)	reversible work, exergy
(b)	irreversible work, exergy
(c)	reversible work, irreversible work
(d)	none of the mentioned

Availability function for a steady flow system is given by

(a)	$H - T_{0} S$
(b)	$H + T_{0} S$
(c)	$u - T_{0} S$
(d)	$u + T_{0} S$

When the system is in equilibrium with the surroundings, this state of the system is known as

(a)	intial state
(b)	process
(c)	dead state
(d)	intermediate state

The dead state

(a)	is in equilibrium with its surroundings
(b)	has zero exergy
(c)	is in equilibrium with its surroundings and zero exergy
(d)	minimum energy

When a system changes its state towards that of surroundings, the opportunity to produce more work

(a)	increases
(b)	decreases
(c)	remains constant
(d)	none of the mentioned

10.

When we obtain useful work during a process in which a finite system undergoes a change of state, when should that process terminate?

(a)	When the pressure of system equals the pressure of surroundings
(b)	When the temperature of system equals the temperature of surroundings
(c)	When the system has reached the dead state
(d)	All of the mentioned

Showing 1 to 10 out of 30 Questions