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GATE Mechanical Engineering (ME) 2020 Shift 2 Solved Paper

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Question : 48

Total: 65

In a steam power plant, superheated steam at 10MPa and 500∘C, is expanded is entropically in a turbine until it becomes a saturated vapour. It is then reheated at constant pressure to 500∘C. The steam is next expanded is entropically in another turbine until it reaches the condenser pressure of 20kPa. Relevant properties of steam are given in the following two tables. The work done by both the turbines together is ___________KJ/kg (round off to the nearest integer).
Superheated Steam Table:

Pressure, p (MPa)	Temperature, T (°C)	Enthalpy, h(kJ/kg)	Entropy, s (kJ/kg.K)
10	500	3373.6	6.5965
1	500	3478.4	7.7621

Saturated Steam Table:

Pressure, p	Sat. Temp. Tsat (°C)	Enthalpy, h (kJ/kg)		Entropy, s (kJ/kg.K)
Pressure, p	Sat. Temp. Tsat (°C)	hr	hg	Sr	Sg
1 MPa	179.91	762.9	2778.1	2.1386	6.5965
20 kPa	60.06	251.38	2609.7	0.8319	7.9085

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