A gas turbine plant working on Joule cycle produces 4000 kW of power. If its work ratio is 40%, what is the power consumed by the compressor in (kW)

  1. 6000
  2. 4000
  3. 160
  4. 1000

Answer (Detailed Solution Below)

Option 1 : 6000
Free
ST 1: UPSC ESE (IES) Civil - Building Materials
20 Qs. 40 Marks 24 Mins

Detailed Solution

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Concept:

Gas turbines operate on the Brayton cycle/Joule cycle. The Brayton cycle consists of four internally reversible processes:

  • Isentropic compression (in a compressor)
  • Constant-pressure heat addition
  • Isentropic expansion (in a turbine)
  • Constant-pressure heat rejection

Work ratio: Work ratio in the gas turbine is defined as the ratio of net-work to the turbine work.

The net-work in the turbine is given by Wturbine – Wcompressor, because the compressor is work consuming device therefore it consumes the work.

Calculation:

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