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An ideal gas undergoes an isothermal expansion from state R to state S in the turbine as shown in the diagram given below:

The area of the shaded region is 1000 N-m. The amount is turbine work done during the process is

  1. 14,000 N-m
  2. 12,000 N-m
  3. 11,000 N-m
  4. 10,000 N-m

Answer (Detailed Solution Below)

Option 3 : 11,000 N-m
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Detailed Solution

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The area under the P-V diagram gives work done.

Turbine work = Area under curve R-S = Area of Rectangle + Area of shaded region

W = (0.2 – 0.1) × 1 × 105 + 1000

W = 11000 N – m

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