1
GATE ME 2014 Set 3
+1
-0.3
Which one of the following pairs of equations describes an irreversible heat engine?
A
$$\oint {\delta Q} > 0\,\,$$ and $$\oint {{{\delta Q} \over T}} < 0$$
B
$$\oint {\delta Q} > 0\,\,\,\,and\,\,\,\oint {{{\delta Q} \over T}} < 0$$
C
$$\oint {\delta Q} > 0\,\,\,\,and\,\,\,\oint {{{\delta Q} \over T}} > 0$$
D
$$\oint {\delta Q} < 0\,\,\,\,and\,\,\,\oint {{{\delta Q} \over T}} > 0$$
2
GATE ME 2010
+1
-0.3
One kilogram of water at room temperature is brought into contact with a high temperature thermal reservoir. The entropy change of the universe is
A
equal to entropy change of the reservoir
B
equal to entropy change of water
C
equal to zero
D
always positive
3
GATE ME 2009
+1
-0.3
If a closed system is undergoing an irreversible process, the entropy of the system
A
Must increase
B
Always remains constant
C
Must decrease
D
Can increase, decrease or remain constant
4
GATE ME 2008
+1
-0.3
$$2$$ moles of oxygen are mixed adiabatically with another $$2$$ moles of oxygen in mixing chamber, so that the final total pressure and temperature of the mixture become same as those of the individual constituents at, their initial states. The universal gas constant is given as $$R$$. The change in entropy due to mixing, per mole of oxygen, is given by
A
$$-R$$ $$ln2$$
B
$$0$$
C
$$R$$ $$ln2$$
D
$$R$$ $$ln4$$
GATE ME Subjects
EXAM MAP
Medical
NEET