1
GATE ME 1993
+1
-0.3
A reversible heat transfer demands:
A
The temperature difference causing heat transfer tends to zero
B
The system receiving heat must be at a constant temperature.
C
The system transferring out heat must be at a constant temperature.
D
Both interacting systems must be at constant temperatures
2
GATE ME 1993
+2
-0.6
Round the clock cooling of an apartment having a load of $$300$$ $$MJ/day$$ requires and air-conditioning plant of capacity about
A
$$1$$ ton
B
$$5$$ tons
C
$$10$$ tons
D
$$100$$ tons
3
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
$$\oint {{{\delta Q} \over T}} > 0$$
4
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
$$\delta Q = p\,dv + dU$$
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