1
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
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 heat transfer between each thermal reservoir and the cyclic device takes place across negligible temperature difference. Interactions between the cyclic device and the respective thermal reservoirs that are shown in the figure are all in the form of heat transfer. GATE ME 2008 Thermodynamics - Entropy and Irreversibility Question 11 English

The cyclic device can be

A
a reversible heat engine
B
a reversible heat pump or a reversible refrigeration
C
an irreversible heat engine
D
an irreversible heat pump or an irreversible refrigerator
2
GATE ME 2005
MCQ (Single Correct Answer)
+2
-0.6
A vapor absorption refrigeration system is a heat pump with three thermal reservoirs as shown in the figure. A refrigeration effect of $$100$$ $$W$$ is required at $$250$$ $$K$$ when the heat source available is at $$400$$ $$K.$$ Heat rejection occurs at $$300$$ $$K.$$ The minimum value of heat required (in $$W$$) is GATE ME 2005 Thermodynamics - Entropy and Irreversibility Question 12 English
A
$$167$$
B
$$100$$
C
$$80$$
D
$$20$$
3
GATE ME 2003
MCQ (Single Correct Answer)
+2
-0.6
Considering the relationship $$TdS=dU+PdV$$ between the entropy $$(S),$$ internal energy $$(U),$$ pressure $$(P),$$temperature $$(T)$$ and volume $$(V),$$
Which of the following statements is correct?
A
It is applicable only for a reversible process
B
For an irreversible process,
$$TdS > dU + pdV$$
C
It is valid only for an ideal gas
D
It is equivalent to first law, for a reversible process
4
GATE ME 2003
MCQ (Single Correct Answer)
+2
-0.6
Nitrogen gas (molecular weight $$28$$) is enclosed in a cylinder by a piston, at the initial condition of $$2$$ bar, $$298$$ $$K$$ and $$1\,\,{m^3}$$. In a particular process, the gas slowly expands under isothermal condition, until the volume becomes $$2{m^3}.$$ Heat exchange occurs with the atmosphere at $$298$$ $$K$$ during this process.

The work interaction for the Nitrogen gas is

A
$$200$$ $$kJ$$
B
$$138.6$$ $$kJ$$
C
$$2$$ $$kJ$$
D
$$-200$$ $$kJ$$
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