List of Electronics and Communication Industries

1.  Arise India
   
2. Aar em electronics
   
3. Aircel Cellular Ltd
   
4. Avaya Global
   
5. Astra Microwave Product Ltd
   
6. AMCO BATTERIES LIMITED
7. ABHA ELECTROMECH PRIVATE LIMITED
8. ABLE ELECTRONIC SERVICES
9. Amara Raja Batteries Ltd
10. BONFIGLIOLI TRANSMISSIONS PVT. LTD.
11. BARCO ELECTRONIC SYSTEMS PVT LTD
12. Bharat Electronics Limited
13. Bartronics India Ltd
14. Birla Ericsson Optical Ltd
15. BSNL
16. BHEL
17. BPL Group
18. Bharti Teletech
19. Bharti Airtel Ltd
20. CMC Ltd
21. Cybele Industries Ltd
22. Cable Corporation of India Ltd
23. Cranes Software International Ltd
24. Celkon
25. Central Electronics Limited
26. Cosmic Circuits
27. centum electronics
28. COLOGICX SYSTEMS LTD
29. CoreEL TECHNOLOGIES (I) PVT. LTD.
30. CADENCE DESIGN SYSTEMS INDIA PVT LTD.
31. DIGITAL-X
32. Dell India Private Ltd
33. Delton Cables Ltd
34. Delta Energy Systems (India) Pvt Ltd
35. Datamatics Global Services
36. DRDO
37. EBM-PAPST INDIA PRIVATE LIMITED
38. Electronics Corporation of India Limited
    
39. Ericsson
    
40. Educomp Solutions Ltd
    
41. Exide Industries Ltd
    
42. EMC India
    
43. Eveready
    
44. Finlex Cables Ltd
    
45. EPCOS
    
46. GR Cables Ltd
    
47. Gemini Communications
    
48. User:Gejo Royce/sandbox
    
49. HAL
    
50. HFCL Infotel Ltd
    
51. Hindustan Cables Ltd
    
52. ISRO
    
53. ITI Ltd
    
54. Industries India Ltd
    
55. IBall (company)
    
56. Intex Technologies
    
57. Ittiam Systems
    
58. JABIL CIRCUITS
    
59. Kenstar
    
60. Kavveri Telecom Product Ltd
    
61. Krone Communications
    
62. LYF
    
63. Micromax Informatics
    
64. Mphone
    
65. moser baer India ltd
    
66. Motorola
    
67. Midas communication technologies
    
68. NTPC
    
69. Nokia Ltd
    
70. Nelco
    
71. Nu Tek
    
72. Nortel
    
73. Onida Electronics
    
74. Orient Electric
    
75. Optel Telecommunication
    
76. O.E.N INDIA
    
77. ONGC
    
78. Pioneer India
    
79. Qualcomm India
    
80. Ringing Bells Private Limited
    
81. RPG Cables Ltd
    
82. Rishabh instruments.
    
83. Reliance electronics
    
84. Samtel Group
    
85. Simmtronics
    
86. Sonodyne
    
87. Sterlite Technologies
    
88. Shivanand Electronics
    
89. Seimens
    
90. Su-Kam Power Systems
    
91. Shyam Telecom
    
92. SAIL
    
93. GAIL
    
94. TVS Electronics
    
95. TAS powertech
    
96. Videocon
    
97. Xerox India
    
98. Xolo (company)
    
99. XL Telecom & Energy Lilmited
    
100. Zync Global
     

Basics of Circuit Theory

What is Elecrical Network?

Any arrangment of the various electrical energy sources (voltage sources, current sources, batteries) with the dfferent circuit elements (resistors, inductors, capacitors,swicthes).

Network Element

Resister,Inductor, Capacitor and Energy sources such as voltage and current sources , having two ends for further connection known as ckt elements.

Node

If two or more circuit elements are joint at any point , the connection point is known as node.

Junction

If three or more circuit elements are joint at any point,the connection point is known junction.

Cuircuit & Network

Any combination of various circuit elements to perform any useful function is known as network .

Mesh & Loop

Any closed path formed by various circuit elements in a given circuit is known as a loop.

Active  Network

The circuit elements which produce electrical energy but not consume any energy known as active element and Network in which both type of cicuit elements are known as active network.

e.g. voltage source and current source.

Passive Network

The circuit elements which consume electrical energy but not produce any energy known as passive element and Network in which both type of cicuit elements are known as passive network.

e.g. R,L,C 

Linear Network

Circuit elements having voltage and current relationship are given by constant coefficient equation known as linear element and Network in which these cicuit elements are connected known as linear network

Non-Linear Network

Circuit elements having voltage and current relationship are not given by constant coefficient equation known as non-linear element and Network in which these cicuit elements are connected known as non-linear network.

Lumped Network

The network where the circuit elements are physically separable is known as lumped network

e.g. Any practical network

Distributed Network

The network where the circuit elements are not physically separable is known as Distributed network.

e.g. Transmission line, telephone line etc.

Unilateral Network 

An element whose operational behaviour is dependent on the direction of flow of current through is known as unilateral elements. Elements like semiconductor diode, which allow the current to pass through them only in one direction. and network in which these elements are connected known as Unilateral Network

Bilateral Network

An element whose behaviour is same irrespective of the direction of flow of current through it is known as bilateral element. Passive elements that allow the current to pass through them in both directions are known as bilateral elements and the network in which these elements are connected known as Bilateral Network

Basic Electronics Components And its Symbols

Sr. No.	Name of Component	Symbol
1	Resistor
2	Variable Resistor
3	Capacitor
4	Junction diode
5	Zener diode
6	Photo diode
7	light-emitting diode (LED)
8	npn transistor
9	pnp transistor
10	n-type junction field effect transistor (NJFET)
11	p-type junction field effect transistor (PJFET)
12	ammeter
13	voltmeter

Systems of Units

SI Prefixes

Sr. no              Multiple                Prefix               Symbol

1                       10¹²                                tera                               T

2                       10⁹                                  giga                       G

3                       10⁶                                  mega                     M

4                       10³                                  kilo                       K

5                       10²                                 centi                      C

6                       10^-3                                milli                       m

7                       10^-6                                micro                     µ

8                       10^-9                                 nano                      n

9                       10^-12                               pico                       p

10                     10^-15                               femto                     f

                     

System of Units

 Derived Units in SI

  
Sr No                  Quantity                          Unit Name                                         Symbol
1                          Acceleration                      meter per second square                          -
2                          Velocity                             meter per second                                     -
3                           Frequency                        Hertz                                                      Hz
4                           Force                               Newton                                                  N
5                           Pressure                           Pascal                                                     Pa
6                           Density                             kilogram per cubic meter                         -
7                           Energy or work                 joule                                                       J
8                           Power                               watt                                                       W
9                           Electric charge                   coulomb                                                 C
10                         Electric Potential                volt                                                         V
11                          Electric resistance              ohm                                                        Ω
12                          Electric conductance         siemens                                                   S
13                          Electric capacitance           farad                                                      F
14                          Magnetic flux                     weber                                                   Wb
15                          Inductance                         Henry                                                    H

SI Base Units

Sr No          Quantity                                         Name                  Symbol

1                  Length                                           Meter                    m

2                  Mass                                             Kilogram               kg

3                  Time                                               second                 s

4                  Electric current                               Ampere                A

5                  Thermodynamic Temperature          kelvin                   K

6                  Amount of substance                      mole                     mol

7                  Luminance Intensity                        candela                 cd

syllabus for the Jr. engg exam at mahagenco 2013

Aptitude :Technical & Non technical, Verbal Ability, Quantitative Ability ,Logical Reasoning, Objective      English

Diploma / Degree Electronics:

Control Systems, Digital Electronics and Logic Design, Electronics Devices and Circuits, Micro processor/Microcontrollers, Operational Amplifiers, Power Electronics, Principles of Communication engineering

Diploma / Degree Electronics & Power:

AC power transmissions, Bulk power transmissions, Distribution of power, Generation of electrical power

Electronics & Communication/Basics

Dimploma / Degree Electronics & Telecomm:

Analog Circuits Basics,Integrated Circuits and Digital Electronics, Micro Processor and Micro Controllers

Other Electronic Devices, PLT ,Semiconductors and Transistor Devices

Reference: www.mahagenco.in