Bharat Sanchar Nigam Ltd. (BSNL) every year invites applications from eligible Indian citizens for recruitment to the cadre of Telecom Technical Assistant TTA (Group-C) posts. These recruitment of BSNL TTA is done in various states at same time in India. The Telecom Technical Assistant (TTA) is a SSA cadre. Selection is done through a competitive Examination followed by a medical test. Appointment will be subject to police verification, successful completion of training and other usual formalities.

Eligibility to apply for BSNL TTA Exam:
– Age Limit:Candidate must be below 18 years and not exceed 30 years at the time of applying for the post.
– Educational Qualifications:Candidate must have completed three years of engineering Diploma / B.Tech / B.E in any of the disciplines Telecommunication, Electronics, Electrical, Radio, Computer, Instrumentation, Information Technology from Central Govt. / State Govt. recognized Institution.
Or he/she should be B.Sc (Electronics / Computer Science) Or M.Sc (Electronics).

Minimum Qualifying marks in the paper will be 40% for the candidates of unreserved communities and 33 % for the candidates of SC/ST/OBC categories. Also, minimum passing marks in each of the three parts of the paper will be 30% for OC and 20% for SC/ST/OBC categories.
There will be negative marking. For each wrong answer 25% of mark of that question will be deducted.

BSNL TTA Exam Pattern: There is only one Paper of 200 marks having multiple choice objective typeand duration of the exam will be three hours which is conducted through online examination mode having following sections:

Part Subject Total QuestionsMax. Marks Time Alloted
Part IGeneral Ability Test2020 3 hours
Part IIBasic Engineering9090
Part IIISpecialization9090

The total number of questions in the paper will be 200 and each question shall carry one mark.The standard of paper in General ability test will be such as may be expected of an engineering diploma holder. The standard of paper in other subject will approximately be that of diploma level of an Indian polytechnic.

Note: No interview will be conducted after qualifying the written exam.

Some of the books which can help candidates to prepare for BSNL Telecom Technical Assistant TTA are suggested as below-

Books For BSNL Telecom Technical Assistant (TTA) Preparation :



The candidate’s comprehension and understanding of General English shall be tested through simple exercise such as provision of antonyms and synonyms, fill in the blanks and multiple-choice exercises etc. This shall also include questions on current events, general knowledge and such matters of everyday observation and experience as may be expected of Diploma holder.


Detailed Syllabus is as under:

1. Applied Mathematics: Co-ordinate Geometry; Vector Algebras, Matrix and Determinant ; Differential calculus ; Integral calculus, Differential equation of second order; Fourier Series; Laplace Transform; Complex Number; Partial Differentiation.
2. Applied Physics: Measurement-Units and Dimensions; Waves, Acoustics, Ultrasonic; Light; Laser and its Applications; Atomic Structure and Energy Levels.
3. Basic Electricity: Electrostatics, coulomb’s law, Electric field, Gauss’s theorem, concept of potential difference; concept of capacitance and capacitors; Ohm ‘s law, power energy, Kirchoff’s voltage and 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.
4. 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 circuit elements. Active and Passive components; semi conductors Physics; Semi Conductor Diode; Bipolar Transistor & their circuits; Transistor Biasing & Stabilization of operating point; Single stage transistor amplifier; field effect transistor, Mosfet circuit applications. Multistage Transistor Amplifier; Transistor Audio Power Amplifiers; Feedback in Amplifier; Sinusoidal Oscillators; tuned Voltage Amplifier; Opto Electronics Devices and their applications;
Operational Amplifier; wave shaping and switching circuits. Block diagram of I.C timer(such as 555) and its working; Multivibrator circuits; Time base circuits; Thyristors and UJT; Regulated Power Supply.
5. Digital Techniques: Applications and advantages of digital systems; number system(binary and hexadecimal); Logic Gates; Logic Simplification; Codesand Parity; Arithmetic Circuits; Decoders. Display Devices and Associated Circuits; Multiplexers and De-multiplexers; Latches and Flip Flops; Counters; Shift Register; Memories; A/D and D/A converters.


Detailed Syllabus is as under:

1. Electrical: 3 phase vs single phase supply, Star Delta Connections, relation between phase & line voltage, power factor and their measurements; construction and principles of working of various types of electrical measuring instruments, all types of motor and generator-AC & DC transformers, starters, rectifiers, invertors, battery charges, batteries, servo and stepper motors, contactor control circuits, switch gear, relays, protection devices & schemes, substation, protection relaying, circuit breaker, generator protection, transformer protection, feeder & lightening protection,
feeder & bus bar protection, lightening arrestor, earthing, voltage stabilizer & regulators, power control devices & circuits, phase controlled rectifiers, invertors, choppers, dual converters, cyclo converters; power electronics application in control of drivers, refrigeration & air conditioning.
2. Communication: Modulation and demodulations-principles and operation of various types of AM, FM and PM modulators/demodulators; pulse modulation-TDM,PAM,PPM,PWM; Multiplexing, Principles and applications of PCM.Introduction of Basic block diagram of digital and data communication system; coding error detection and correction techniques; Digital Modulation Techniques-ASK,ICW,FSK,SK; Characteristics/working of data transmission circuits; UART,USART; Modems; Protocols and their functions, brief idea of ISDN interfaces, local area Network; Carrier telephony-Features of carrier telephone system. Microwave Engineering; Microwave Devices; Waveguides; Microwave Components; Microwave antennas; Microwave Communication System-Block diagram & working principles of microwave communication link.
3. Network, Filters and Transmission Lines: Two point network, Attenuator; Filters; Transmission Lines and their applications; characteristic impedance of line; concept of reflection and standing waves on transmission line; Transmission line equation; Principle of impedance matching; Bandwidth consideration of transmission line.
4. Instruments and Measurements: Specification of instruments-accuracy, precision, sensitivity, resolution range. Error in measurement and loading effect; Principles of voltage, current and resistance measurement; Transducers, measurement of displacement & strain, force & torque measuring devices, flow of measuring devices, power control devices & circuits. Types of AC millivoltmeters-Amplifier rectifier amplifier: Block diagram explanation of a basic CRO and a triggered sweep oscilloscope, front panel controls; Impedance Bridges and Q-Meters. Principles of working and specification of logic probes, signal analyzer and logic analyzer, signal generator, distortion factor meter, spectrum analyzer.
5. Control Systems: Basic elements of control system , open and closed loop system, concepts of feedback. Block diagram of control system, Time lag, hysterisis linearity concepts; Self regulating and non self regulating control systems. Transfer function of simple control components, single feedback configuration.Time response of systems. Stability Analysis; Characteristics equation. Routh’s table, Nyquist Criterion, Relative stability, phase margin and gain margin. Routh Harwitz criterion; Root Locus technique, Bode plot, Power plot, gain margin and phase margin.
6. Microprocessors: Typical organization of microcomputer system and functions of its various blocks, Architecture of a Microprocessor; Memories and I/O Interfacing; Brief idea of M/C & assembly languages, Machines and Mnemonic codes; Instructions format and Addressing mode; concept Instruction set; programming exercises in assembly language; concept of interrupt; Data transfer techniques-sync data transfer, async data transfer, interrupt driven data transfer, DMA, serial output data, serial input data.
7. Computer: Computers and its working, types of computers, familiarization with DOS and windowconcept of file, directory, folder, Number Systems; Data Communication. Programming-Elements of a high level programming language, PASCAL, C; use of basic data structures; Fundamentals of computer architecture, Processor design, control unit design; Memory organization. I/O System Organization. Microprocessor-microprocessor architecture, instruction set and simple assembly level programming. Microprocessor based system design: typical examples. Personal computers and their typical uses, data communication principles, types and working principles of modems, Network principles, OSI model, functions of data link layer and network layer, networking components; communication protocol-x.25, TCP/IP. Database Management System-basic concepts, entity relationship model, relational model, DBMS based on relational model.

Candidates can also download the syllabus of BSNL TTA from here.

Above stated books consists of all the related topics as mentioned above at one place.

We wish our candidates All The Best for the Upcoming Exams and wish them great future ahead!!

Leave a comment below for any further queries or suggestions.

BSNL – Bharat Sanchar Nigam Ltd, largest telecommunication company of India which is owned by Government every year invites applications from eligible Indian citizens for recruitment to the cadre of Junior Telecom Officers JTO posts at a very large scale. Recruitment of BSNL JTO is done under three main sections which are:
1) Junior Telecom Officers Telecom (JTO Telecom)
2) Junior Telecom Officers Electric (JTO Electric)
3) Junior Telecom Officers Civil (JTO Civil)
Candidates from the similar field can apply according to their specific specialization i.e. Electronics, Telecommunications, Radio, Computers, Electrical or Information Technology, Mechanical and Civil are eligible to apply. Selection is done through a competitive Examination followed by a medical test.

BSNL JTO Exam Eligibility:Age Limit: Candidate should be between the age of minimum 21 years and maximum of 35 years at the time of applying.
– Candidates must possess Bachelor of Engineering / Bachelor of Technology (B.Tech Degree) or equivalent Engineering degree in any of the following disciplines from a recognized engineering college/university:
i) Telecommunication
ii) Electronics
iii) Radio
iv) Computer
v) Electrical
vi) IT (Information Technology)
vii) Instrumentation
– Candidates appearing in the final year degree examination may also apply provided they possess the required educational qualification

BSNL JTO Exam Pattern: BSNL JTO exam is a multiple choice objective type written examination conducted in three main sections.

Part Subject No. of QuestionTime Alloted
Part IGeneral Ability Test20
3 hours
Part IIEngineering Stream I50
Part IIIEngineering Stream II50

NOTE: – Engineering section questions will be according to specialization choose i.e. Telecom, Electric or Civil.
– The standard of paper in engineering subjects will be that of Engineering Examination of an Indian University.
– No separate time fixed for attempting the separate sections. 3 hours is a composite time.

BSNL JTO Selection Process: – Candidates have to secure minimum qualifying marks for each section as well as in the aggregate. Candidates obtaining less than minimum-qualifying marks in any of the sections or in aggregate shall not be considered for inclusion in the merit-list.
– No interview will be conducted after qualifying the written exam.

Some of the books which can help candidates to prepare for BSNL Junior Telecom Officers or BSNL JTO are suggested as below-

Books For BSNL Junior Telecom Officer (JTO) Preparation :

Above stated books consists of all the related topics as mentioned above at one place.

Syllabus of BSNL JTO Exam: In the general ability test, special attention will be paid to assess the candidate’s capacity for general awareness. The standard of paper in general ability test will be such as may be expected of an Engineering Graduate.

Download Syllabus for BSNL JTO Exam.

We wish our candidates All The Best for the Upcoming Exams and wish them great future ahead!!

Leave a comment below for any further queries or suggestions.