1
GATE ME 1993
+1
-0.3
When a system executes an irreversible cycle:
A
$$\oint {{{\delta Q} \over T}} < 0$$
B
$$\oint {dS > 0}$$
C
$$\oint {dS = 0}$$
D
$$\oint {{{\delta Q} \over T}} > 0$$
2
GATE ME 1993
+1
-0.3
Which among the following relations is/are valid ONLY for reversible process undergone by a pure substance?
A
$$\delta Q = dU + \delta W$$
B
$$T\,ds = dU + \delta W$$
C
$$T\,ds = dU + p\,dv$$
D
$$\delta Q = p\,dv + dU$$
3
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.
4
GATE ME 1993
+2
-0.6
The equivalent evaporation $$(kg/hr)$$ of a boiler producing $$2000$$ $$kg/hr$$ of steam with enthalpy content of $$2426$$ $$kJ/kg$$ from feed water at temperature $${40^ \circ }C$$ (liquid enthalpy $$=168$$ $$kJ/kg$$) is (Enthalpy of vaporization of water at $${100^0}C = 2258$$ $$kJ/kg$$).
A
$$2000$$
B
$$2149$$
C
$$186$$
D
$$1649$$
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