Thermodynamics Solved Numerical Problems – Step by Step (Mechanical Engineering)

TITLE:
Thermodynamics – Solved Numerical Problems (Step by Step)

SUBJECT:
Thermodynamics

COURSE:
Diploma / BE / BTech – Mechanical Engineering

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DESCRIPTION:
This document contains a complete set of important solved numerical
problems from Thermodynamics. All problems are solved step by step
with formulas, calculations, and final answers. Very useful for
exam preparation, assignments, and quick revision.

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CONTENTS:

PROBLEM 1: First Law of Thermodynamics
Given:
Heat supplied = 600 kJ
Work done = 250 kJ

Solution:
According to First Law,
Q = ΔU + W

ΔU = Q − W
ΔU = 600 − 250
ΔU = 350 kJ

Answer:
Change in internal energy = 350 kJ

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PROBLEM 2: Heat Engine Efficiency
Given:
Heat supplied = 2000 kJ
Heat rejected = 1400 kJ

Solution:
Efficiency (η) = (Q1 − Q2) / Q1

η = (2000 − 1400) / 2000
η = 0.3 or 30%

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