GATE ME 1993 | GATE ME Year Wise Previous Years Questions

GATE ME 1993

Subjective

-0

A vertical cylinder with a freely floating piston contains $$0.1$$ $$kg$$ air at $$1.2$$ bar and a small electrical resistor. The resistor is wired to an external $$12$$ Volt battery. When a current of $$1.5$$ amps is passed through the resistor for $$90$$ $$secs,$$ the piston sweeps a volume of $$0.01$$ $${m^3}.$$ Assume $$(i)$$ piston and the cylinder are insulated and $$(ii)$$ air behaves as a ideal gas with $${C_v} = 700\,\,J/kg\,K.$$
Find the rise in temperature of air. GATE ME 1993 Thermodynamics - Calculation of Work and Heat Question 9 English

GATE ME 1993

MCQ (Single Correct Answer)

-0.3

A reversible heat transfer demands:

The temperature difference causing heat transfer tends to zero

The system receiving heat must be at a constant temperature.

The system transferring out heat must be at a constant temperature.

Both interacting systems must be at constant temperatures

GATE ME 1993

MCQ (Single Correct Answer)

-0.6

Round the clock cooling of an apartment having a load of $$300$$ $$MJ/day$$ requires and air-conditioning plant of capacity about

$$1$$ ton

$$5$$ tons

$$10$$ tons

$$100$$ tons

GATE ME 1993

MCQ (Single Correct Answer)

-0.3

When a system executes an irreversible cycle:

$$\oint {{{\delta Q} \over T}} < 0$$

$$\oint {dS > 0} $$

$$\oint {dS = 0} $$

$$\oint {{{\delta Q} \over T}} > 0$$

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