GATE ME

Entropy and Irreversibility

Thermodynamics

(Past Years Questions)

Marks 1

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Which one of the following pairs of equations describes an irreversible heat engine?
GATE ME 2014 Set 3
One kilogram of water at room temperature is brought into contact with a high temperature thermal reservoir. The entropy...
GATE ME 2010
If a closed system is undergoing an irreversible process, the entropy of the system
GATE ME 2009
$$2$$ moles of oxygen are mixed adiabatically with another $$2$$ moles of oxygen in mixing chamber, so that the final to...
GATE ME 2008
Which of the following relationships is valid only for reversible process undergone by a closed system of simple compres...
GATE ME 2007
For an ideal gas the expression $$\left[ {T{{\left( {{{\delta s} \over {\delta T}}} \right)}_p} - T{{\left( {{{\delta s}...
GATE ME 1997
A system undergoes a state change from $$1$$ to $$2.$$ According to the second law of thermodynamics, for the process to...
GATE ME 1997
The slopes of constant volume and constant pressure lines in the $$T$$-$$s$$ diagram are ___________ and ___________resp...
GATE ME 1994
A $$1500$$ $$W$$ electrical heater is used to heat $$20$$ $$kg$$ of water $$\left( {{C_p} = 4186\,\,J/kg\,\,K} \right)$$...
GATE ME 1994
Which among the following relations is/are valid ONLY for reversible process undergone by a pure substance?
GATE ME 1993
When a system executes an irreversible cycle:
GATE ME 1993

Marks 2

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One $$kg$$ of an ideal gas (gas constant $$R=287$$ $$J/kg$$-$$K$$) undergoes an irreversible process from state- $${\rm ...
GATE ME 2017 Set 2
One kg of air ($${R = 287\,\,J/kg}$$-$$K$$) under goes irreversible process between equilibrium state $$1\,\,\left( {{{2...
GATE ME 2015 Set 2
A closed system contains $$10$$ $$kg$$ of saturated liquid ammonia at $${10^ \circ }C.$$ Heat addition required to conve...
GATE ME 2014 Set 4
Two identical metal blocks $$L$$ and $$M$$ (specific heat $$=0.4$$ $$kJ/kg.K$$), each having a mass of $$5$$ $$kg,$$ are...
GATE ME 2014 Set 4
An amount of $$100$$ $$kW$$ of heat is transferred through a wall in steady state. One side of the wall is maintained at...
GATE ME 2014 Set 3
An ideal gas of mass $$m$$ and temperature $${T_1}$$ undergoes a reversible isothermal process from an initial pressure ...
GATE ME 2012
In an experimental set-up, air flows between two stations $$P$$ and $$Q$$ adiabatically. The direction of flow depends o...
GATE ME 2011
In an experimental set-up, air flows between two stations $$P$$ and $$Q$$ adiabatically. The direction of flow depends o...
GATE ME 2011
Consider the following two processes; $$\left( {\rm I} \right)$$ A heat source at $$1200$$ $$K$$ loses $$2500$$ $$kJ$$ ...
GATE ME 2010
A cycle device operates between three thermal reservoirs, as shown in the figure. Heat is transferred to/from the cyclic...
GATE ME 2008
A vapor absorption refrigeration system is a heat pump with three thermal reservoirs as shown in the figure. A refrigera...
GATE ME 2005
Considering the relationship $$TdS=dU+PdV$$ between the entropy $$(S),$$ internal energy $$(U),$$ pressure $$(P),$$tempe...
GATE ME 2003
Nitrogen gas (molecular weight $$28$$) is enclosed in a cylinder by a piston, at the initial condition of $$2$$ bar, $$2...
GATE ME 2003
Nitrogen gas (molecular weight $$28$$) is enclosed in a cylinder by a piston, at the initial condition of $$2$$ bar, $$2...
GATE ME 2003
One kilomole of an ideal gas is throttled from an initial pressure of $$0.5$$ $$MPa$$ to $$0.1$$ $$MPa.$$ The initial te...
GATE ME 1995
Figure below shows a reversible heat engine $${E_R}$$ having heat interactions with three constant temperature systems. ...
GATE ME 1993

Marks 5

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An iron cube at a temperature of $$400$$ deg $$C$$ is dropped into an insulated bath containing $$10$$ $$kg$$ water at $...
GATE ME 1996

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