GATE Prep

Tools & Solved Questions

ChemeGate provides interactive calculators, step-by-step solved previous year questions, and comprehensive topic guides for GATE Chemical Engineering exam preparation.

Built by a Chemical Engineering student who understands the exam. Answers verified against official IIT GATE answer keys.

All Tools

ThermodynamicsAntoine Equation Calculator

Heat TransferLMTD Calculator

Fluid MechanicsReynolds Number

Exam PrepSolved PYQs

ReferenceTopic Guides

ThermodynamicsAntoine Equation Calculator

Heat TransferLMTD Calculator

Fluid MechanicsReynolds Number

Exam PrepSolved PYQs

ReferenceTopic Guides

More Calculators

View all 9 →

Colebrook · Swamee-Jain

Friction Factor Calculator

Darcy friction factor via 64/Re (laminar) or Colebrook/Swamee-Jain (turbulent), with full step-by-step solutions.

Cavitation Check

NPSH Available Calculator

Net Positive Suction Head available (NPSHa), with a cavitation check against your pump's required NPSH.

Antoine-Based

Psychrometric Calculator

Compute humidity, relative humidity, and related psychrometric properties from dry-bulb temperature.

Motor Sizing

Pump Power Calculator

Compute hydraulic power (ρgQH) and brake power for motor sizing, with full step-by-step solutions.

Sizing

Heat Exchanger Area

Size a heat exchanger with A = Q/(U×LMTD), with full step-by-step solutions.

Darcy-Weisbach

Pipe Pressure Drop

Frictional pressure drop from pipe and fluid data via Darcy-Weisbach, with automatic friction factor.

Solved GATE Questions

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Q47GATE 2025 · Q47

Phase Rule

PYQ Data & Analysis

195All 195 PYQs

Browse by Topic

Every GATE CH question from 2024–2026, answer-first, grouped by topic.

Real Data

Topic Weightage

Actual question counts per topic per year, not estimates.

Real Data

Difficulty Breakdown

MCQ vs MSQ vs NAT split per topic, the real difficulty signal.

Want the full picture? See every tool on the GATE Chemical Engineering calculators guide, or browse the complete GATE ChemE previous year questions collection.

Topic Guides

View all 16 →

Topic Guide

Heat Transfer Topic Guide

Full syllabus breakdown for Heat Transfer, subtopics, essential formulas, PYQ frequency, and recommended study order.

Topic Guide

Fluid Mechanics Topic Guide

Full syllabus breakdown for Fluid Mechanics, subtopics, essential formulas, PYQ frequency, and recommended study order.

Topic Guide

Mass Transfer Topic Guide

Full syllabus breakdown for Mass Transfer, subtopics, essential formulas, PYQ frequency, and recommended study order.

Topic Guide

Process Calculations Topic Guide

Material & energy balances, recycle/bypass/purge systems, and combustion stoichiometry for GATE CH.

Topic Guide

Thermodynamics Topic Guide

Laws, equations of state, fugacity, VLE, phase rule, and reaction equilibria for GATE CH.

Topic Guide

Mechanical Operations (Unit Operations) Topic Guide

Particle size, screening, size reduction, sedimentation, filtration, and fluidization, the core unit operations section for GATE CH.

From the Blog

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Blog

LMTD vs Effectiveness-NTU: Two Ways to Size a Heat Exchanger

Both methods solve the exact same heat exchanger sizing problem. The difference is which variable you already know, and that decides which one you can actually use.

Blog

How Multi-Effect Evaporators Save Steam in Industry

A single evaporator wastes most of the energy in its steam. Chaining several together in series is how industrial plants stop throwing that energy away.

Blog

Reynolds Number in Real Pipelines: Laminar vs Turbulent in Practice

The Reynolds number is one ratio, but the difference it draws between laminar and turbulent flow changes almost everything about how a real pipeline behaves.

Tools & Solved Questions

More Calculators

Friction Factor Calculator

NPSH Available Calculator

Psychrometric Calculator

Pump Power Calculator

Heat Exchanger Area

Pipe Pressure Drop

Solved GATE Questions

Antoine Equation, Dew Point

LMTD, Heat Exchanger Area

Reynolds Number, Pipe Flow

Adsorption

Phase Rule

PYQ Data & Analysis

Browse by Topic

Topic Weightage

Difficulty Breakdown

Topic Guides

Heat Transfer Topic Guide

Fluid Mechanics Topic Guide

Mass Transfer Topic Guide

Process Calculations Topic Guide

Thermodynamics Topic Guide

Mechanical Operations (Unit Operations) Topic Guide

From the Blog

LMTD vs Effectiveness-NTU: Two Ways to Size a Heat Exchanger

How Multi-Effect Evaporators Save Steam in Industry

Reynolds Number in Real Pipelines: Laminar vs Turbulent in Practice