No, it is not part of the syllabus.

GATE Syllabus 2018 for Mechanical Engineering

• Section 1 - Engineering Mathematics

• Section 2 - Applied Mechanics & Design

• Section 3 - Fluid Mechanics & Thermal Sciences

• Section 4 - Materials, Manufacturing & Industrial Engineering

Engineering Mathematics

• Linear Algebra

• Calculus

• Differential equations

• Complex variables

• Probability and Statistics

• Numerical Methods

Applied Mechanics & Design

• Engineering Mechanics

  Recommended

• Mechanics of Materials

• Theory of Machines

• Vibrations

• Machine Design

Fluid Mechanics & Thermal Sciences

• Fluid Mechanics

• Heat-Transfer

• Thermodynamics

• Applications

Materials, Manufacturing & Industrial Engineering

• Engineering Materials

• Casting, Forming and Joining Processes

• Machining and Machine Tool Operations

• Metrology and Inspection

• Computer Integrated Manufacturing

• Production Planning and Control

• Inventory Control

• Operations Research

To check the complete syllabus you can refer below link

GATE Syllabus ME 2018

Good Luck!!