# Fluid Mechanics & Thermal Sciences [GATE (Graduate Aptitude Test in Engineering) Mechanical Engineering]: Questions 39 - 40 of 77

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## Question 39

Fluid Mechanics & Thermal Sciences
Analysis of Thermodynamic Cycles Related to Energy Conversions

Appeared in Year: 2020

### Question

In a steam power plant, superheated steam at 10 MPa and , is expanded isentropically in a turbine until it becomes a saturated vapour. It is then reheated at constant pressure to . The steam is next expanded isentropically in another turbine until it reaches the condenser pressure of 20 kPa. 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, 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 (MPa) Sat. Temperature, Enthalpy, h (kJ/kg) Entropy, s (kJ/kg. K) 1 MPa 179.91 762.9 2778.1 2.1386 6.5965 20 kPa 60.06 251.38 2609.7 0.8319 7.9085

## Question 40

Fluid Mechanics & Thermal Sciences
Behaviour of Real and Ideal Gases
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Appeared in Year: 2021