1
GATE ME 2003
+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
$$-200$$ $$kJ$$
2
GATE ME 2003
+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 entropy change for the system during the process in $$kJ/K$$ is

A
$$0.4652$$
B
$$0.0067$$
C
$$0$$
D
$$-0.6711$$
3
GATE ME 1995
+2
-0.6
One kilomole of an ideal gas is throttled from an initial pressure of $$0.5$$ $$MPa$$ to $$0.1$$ $$MPa.$$ The initial temperature is $$300$$ $$K.$$ The entropy change of the universe is:
A
$$13.38$$ $$kJ/K$$
B
$$4014.3$$ $$kJ/K$$
C
$$0.0446kJ/K$$
D
$$-0.0446$$ $$kJ/K$$
4
GATE ME 1993
Subjective
+2
-0
Figure below shows a reversible heat engine $${E_R}$$ having heat interactions with three constant temperature systems. Calculate the thermal efficiency of the heat engine.
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