Hello, here I am providing you the details of the books to refer for the BSNL TTA exam as under:

Books to refer:
Telecom Technical Asstt (TTA) Guide
Author: Rph Editorial Board

Gateway To TTA
Author: Ashish Dixit & Mayank Srivastava

Guide to T.T.A (Telecom Training Assistant)
Author: Gkp

Practice Papers Bharat Sanchar Nigam Ltd Telecom Technical Assitants (TTA) Recruitment Exam
Author: G K P

Syllabus:
General Ability Test
Current events,
General knowledge,
Reasoning and Social science.
Comprehension and understanding of General
English

Basic Engineering
Applied Mathematics:
Co-ordinate Geometry;
Vector Algebra;
Matrix and Determinant:
Differential Calculus and Integral Calculus:
Differential equation of second order: Fourier Series;
Laplace Transform;
Complex Number;
Partial Differentiation

Applied Physics:
Measurement – Units and Dimensions;
Waves,
Acoustics,
Ultrasonics;
Light;
Laser and its applications;
Atomic Structure and Energy Levels.

Basic Electricity:
Electrostatics,
Coulomb’s Law,
Electric field,
Gauss’s Theorem,
concept of potential difference;
concept of capacitance and capacitors;
Ohm’s law,
power and energy,
Kirchoff’s voltage,
Current laws and their applications in simple DC circuits; Basic Magnetism;
Electro Magnetism: Electromagnetic induction;
concept of alternating
voltage & current;
Cells and Batteries;
Voltage and Current Sources;
Thevenin’s theorem,
Norton’s theorem and their applications.

Electronic Devices and Circuits:
Classification of materials into conductor,
semi conductor,
Insulator etc.,
electrical properties,
magnetic materials,
various types of relays,
Switches and connectors.
Conventional representation of electric and electronic circuits’ elements.
Active and passive components etc

Digital Techniques:
Applications and advantages of digital systems;
Number system (binary and hexadecimal);
Logic Gates;
Logic Simplifications;
Codes and Parity;
Arithmetic Circuits;
Decoders,
Display Devices and Associated Circuits;
Multiplexers and De-multiplexers;
Latches and Flipflops,
Counters,
Shift Register,
Memories;
A/D and D/A converters.