As you want syllabus of Junior Engineer (JE) Recruitment of NTPC, so I am providing complete syllabus here:

NTPC Junior Engineer (JE) Recruitment Exam Syllabus

PART A:
Mechanical:
Mechanics
Theory of Machine
Pneumatics & Hydraulics
Engineering Drawing & Design/Design Calculation
Manufacturing Processes/ Heat & Surface Treatment, Heat & Mass Transfer
Thermal Engineering/ Power Plant Engineering
Strength of Materials
Manufacturing Processes(Drilling, Milling, Boring)/ Manufacturing Technology
Metrology and Mesurements/Tolerance Limits,Fits
Production Design
Mechanical Measuring Instruments

Electrical:
Electrical Engineering Materials
DC Machine, AC Machine & Transformer
Analog Circuits/ Electronics
Digital Electronics
Circuit Theory
Electrical Basics
Generation, Transmission & distribution of Electrical Power
Control System
Network theory
Microprocessor
Electrical Measurements & Measuring Instruments
Power Electronics & Drives

Civil:
Concrete/ construction Technology.
Fluid Mechanics.
Engineering Mechanics.
Civil Engineering Materials.
Environmental Engineering.
Structural Engineering/RCC design.
Survey estimating.
Strength of Materials.
Transportation Engineering.
Structural Engineering/Steel/ Reinforced Cement Concrete.
Soil Mechanics.

C & I:
Basic Electronics/ Power Electronics.
Analog Electronics.
Open/Closed/Cascade loop control.
Pneumatic control.
Networking/ computer networks.
Cabling.
Power Electronics & Drives.
Sensors & Transducers.
Measurement & Instrumentation.
PLC/DCS/SCADA.
Basic Data Acquisition Systems.
Control valves and on/off valves.
Field instrumentation system.
Circuit Theory/ Digital Electronics.
PID controlling & tuning.

PART B:
Aptitude Test:
HCF, LCM
Simplification
Unitary Method
Time and Work
Profit and Loss
Simple and Compound Interest
Algebra
Data Interpretation
Number System
Percentage
Ratio and Proportions
Mensuration (2D and 3D)
Average
Decimal Fractions

English:
English Language.
Grammar.
Sentence structure.
Fill in the blanks.
Spellings.
Detecting Mis-spelt words.
One word substitutions.
Shuffling of sentence parts.
Comprehension passage.
Vocabulary.
Idioms and phrases.
Antonyms.
Spot the error.
Synonyms/ Homonyms.
Improvement.
Cloze passage.
Shuffling of Sentences in a passage.

Reasoning:
Problem Solving.
Decision Making.
Non-Verbal Series.
Analogies.
Number Series.
Directions.
Alphabet Series.
Arrangements.
Blood Relations.
Visual Memory.
Clocks & Calendars.
Mirror Images.
Coding-Decoding.
Arithmetical Reasoning.
Number Ranking.
Cubes and Dice.
Syllogistic Reasoning.
Judgment.
Embedded Figures etc.