# Entropy and Irreversibility · Thermodynamics · GATE ME

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## Marks 1

GATE ME 2014 Set 3
Which one of the following pairs of equations describes an irreversible heat engine?
GATE ME 2010
One kilogram of water at room temperature is brought into contact with a high temperature thermal reservoir. The entropy change of the universe is
GATE ME 2009
If a closed system is undergoing an irreversible process, the entropy of the system
GATE ME 2008
$$2$$ moles of oxygen are mixed adiabatically with another $$2$$ moles of oxygen in mixing chamber, so that the final total pressure and temperature o...
GATE ME 2007
Which of the following relationships is valid only for reversible process undergone by a closed system of simple compressible substance (neglect chang...
GATE ME 1997
For an ideal gas the expression $$\left[ {T{{\left( {{{\delta s} \over {\delta T}}} \right)}_p} - T{{\left( {{{\delta s} \over {\delta T}}} \right)}_v... GATE ME 1997 A system undergoes a state change from$$1$$to$$2.$$According to the second law of thermodynamics, for the process to be feasible, the entropy chan... GATE ME 1994 A$$1500W$$electrical heater is used to heat$$20kg$$of water$$\left( {{C_p} = 4186\,\,J/kg\,\,K} \right)$$in an insulated bucket, from ... GATE ME 1994 The slopes of constant volume and constant pressure lines in the$$T$$-$$s$$diagram are ___________ and ___________respectively. GATE ME 1993 When a system executes an irreversible cycle: GATE ME 1993 Which among the following relations is/are valid ONLY for reversible process undergone by a pure substance? ## Marks 2 GATE ME 2017 Set 2 One$$kg$$of an ideal gas (gas constant$$R=287J/kg$$-$$K$$) undergoes an irreversible process from state-$${\rm I}$$($$1$$bar,$$300K$... GATE ME 2015 Set 2 One kg of air ($${R = 287\,\,J/kg}$$-$$K$$) under goes irreversible process between equilibrium state $$1\,\,\left( {{{20}^ \circ }C,\,\,0.9\,\,{m^3}}... GATE ME 2014 Set 4 A closed system contains$$10kg$$of saturated liquid ammonia at$${10^ \circ }C.$$Heat addition required to convert the entire liquid into satu... GATE ME 2014 Set 4 Two identical metal blocks$$L$$and$$M$$(specific heat$$=0.4kJ/kg.K$$), each having a mass of$$5kg,$$are initially at$$313K.$$A... GATE ME 2014 Set 3 An amount of$$100kW$$of heat is transferred through a wall in steady state. One side of the wall is maintained at$${127^ \circ }C$$and the ot... GATE ME 2012 An ideal gas of mass$$m$$and temperature$${T_1}$$undergoes a reversible isothermal process from an initial pressure$${P_1}$$to final pressure$$... GATE ME 2011 In an experimental set-up, air flows between two stations $$P$$ and $$Q$$ adiabatically. The direction of flow depends on the pressure and temperature... GATE ME 2011 In an experimental set-up, air flows between two stations $$P$$ and $$Q$$ adiabatically. The direction of flow depends on the pressure and temperature... GATE ME 2010 Consider the following two processes; $$\left( {\rm I} \right)$$ A heat source at $$1200$$ $$K$$ loses $$2500$$ $$kJ$$ of heat to a sink at $$800$$$...
GATE ME 2008
A cycle device operates between three thermal reservoirs, as shown in the figure. Heat is transferred to/from the cyclic device. It is assumed that he...
GATE ME 2005
A vapor absorption refrigeration system is a heat pump with three thermal reservoirs as shown in the figure. A refrigeration effect of $$100$$ $$W$$ i...
GATE ME 2003
Considering the relationship $$TdS=dU+PdV$$ between the entropy $$(S),$$ internal energy $$(U),$$ pressure $$(P),$$temperature $$(T)$$ and volume $$(V... GATE ME 2003 Nitrogen gas (molecular weight$$28$$) is enclosed in a cylinder by a piston, at the initial condition of$$2$$bar,$$298K$$and$$1\,\,{m^3}$$.... GATE ME 2003 Nitrogen gas (molecular weight$$28$$) is enclosed in a cylinder by a piston, at the initial condition of$$2$$bar,$$298K$$and$$1\,\,{m^3}$$.... GATE ME 1995 One kilomole of an ideal gas is throttled from an initial pressure of$$0.5MPa$$to$$0.1MPa.$$The initial temperature is$$300K.$$Th... GATE ME 1993 Figure below shows a reversible heat engine$${E_R}$$having heat interactions with three constant temperature systems. Calculate the thermal efficien... ## Marks 5 GATE ME 1996 An iron cube at a temperature of$$400$$deg$$C$$is dropped into an insulated bath containing$$10kg$$water at$${25^ \circ }C. The water fi...
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