In a non – flow process, work transfer from the system is 30 kJ, and heat received by the system is 90 kJ. Determine the change in the internal energy.

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SSC JE ME Previous Paper 8 (Held on: 27 October 2020 Evening)
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  1. -60 kJ
  2. -80 kJ
  3. 60 kJ
  4. 80 kJ

Answer (Detailed Solution Below)

Option 3 : 60 kJ
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Detailed Solution

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Concept:

Applying the first law of thermodynamics to the given non-flow system,

Q = Δ U + W

Calculation:

Given:

W = 30 kJ (Positive since work transfer from the system), Q = 90 kJ (Positive since heat transfer to the system)

Now,

Q = ΔU + W

90 = ΔU + 30

∴ ΔU = 60 kJ

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