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Thermodynamics
First Law of Thermodynamics
GATE 2011
Medium

A pump handling a liquid raises its pressure from 1 bar to 30 bar. Take the density of the liquid as 990 kg/m³. The isentropic specific work done by the pump in kJ/kg is

  • A0.10
  • B0.30
  • C2.50
  • 2.93

Explanation

For an incompressible liquid, isentropic pump work = v·Δp = (Δp)/ρ = (30-1)×10⁵/990 = 29×10⁵/990 ≈ 2929 J/kg ≈ 2.93 kJ/kg.

Source: GATE ME 2011 (2011)

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