IMPORTANT ABBRIVIATION/FULL FORMS FOR CRPF RADIO OPERATOR, CIPHER AND RADIO FITTER ENTRANCE EXAMS

Boost your CRPF exam preparation with this ultimate list of important abbreviations and full forms for Radio Operator, Cipher, and Radio Fitter aspirants. From radio frequencies to encryption systems and defence networks, this guide covers every key term you need to crack the exam confidently. Perfect for quick revision and last-minute study!

1. FUNDAMENTALS OF COMPUTER

• ALU – Arithmetic Logic Unit
• CPU – Central Processing Unit
• RAM – Random Access Memory
• ROM – Read Only Memory
• IC – Integrated Circuit
• PC – Personal Computer
• OS – Operating System
• PROM – Programmable Read Only Memory
• EPROM – Erasable Programmable Read Only Memory
• DRAM – Dynamic RAM
• SRAM – Static RAM
• VRAM – Video RAM
• BCD – Binary Coded Decimal
• MIPS – Million Instructions Per Second
• EFTS – Electronic Funds Transfer System
• CPS – Characters Per Second
• USB – Universal Serial Bus
• RJ45 – Registered Jack 45
• UTP – Unshielded Twisted Pair

2. INPUT SYSTEM

3. OUTPUT SYSTEM

• LCD – Liquid Crystal Display
• CPS – Characters Per Second
• LPM – Lines Per Minute
• PPM – Pages Per Minute
• DMP – Dot Matrix Printer
• VGA – Video Graphics Array
• CRT – Cathode Ray Tube

4. PROCESSING SYSTEM

• RISC – Reduced Instruction Set Computer
• GB – Gigabyte
• MB – Megabyte
• KB – Kilobyte

5. COMPUTER STORAGE

• HDD – Hard Disk Drive
• IDE – Integrated Drive Electronics
• CD-RW – Compact Disc-ReWritable
• UDF – Universal Disk Format
• TB – Terabyte
• DVD – Digital Versatile Disc
• CD – Compact Disc

6. OPERATING SYSTEM

• OS – Operating System
• BIOS – Basic Input Output System
• DOS – Disk Operating System
• MS-DOS – Microsoft Disk Operating System
• SYS – System File
• COM – Command File
• CONFIG – Configuration File

7. DATA DETERMINATION

• MB / Mb – Megabyte / Megabit
• ANSI – American National Standards Institute
• ASCII – American Standard Code for Information Interchange
• EBCDIC – Extended Binary Coded Decimal Interchange Code
• ISO – International Organization for Standardization

8. PROGRAMMING LANGUAGES

• CPU – Central Processing Unit
• SQL – Structured Query Language
• COBOL – Common Business-Oriented Language

9. MS WORD

• MS WORD – Microsoft Word
• PDF – Portable Document Format
• DOCX – Document (Microsoft Word)

10. POWER POINT

• MS PowerPoint – Microsoft PowerPoint

11. MS EXCEL

• MS-EXCEL – Microsoft Excel
• XLS – Excel Spreadsheet (file extension)
• VBA – Visual Basic for Applications

12. MS ACCESS

• MS Access – Microsoft Access
• OLE – Object Linking and Embedding
• DCL – Data Control Language
• DML – Data Manipulation Language
• DDL – Data Definition Language
• RDBMS – Relational Database Management System
• OODBMS – Object-Oriented Database Management System
• ORDBMS – Object-Relational Database Management System
• ACCDB – Access Database (File Extension)

13. COMPUTER HARDWARE

• SIMM – Single In-line Memory Module
• DC – Direct Current
• AC – Alternating Current
• FAT – File Allocation Table
• CMOS – Complementary Metal-Oxide-Semiconductor
• VRAM – Video RAM
• BIOS – Basic Input Output System
• IRQ – Interrupt Request
• TFT – Thin-Film Transistor
• CRT – Cathode Ray Tube
• LED – Light Emitting Diode
• HDD – Hard Disk Drive
• CD-RW – Compact Disc-ReWritable
• CD-R – Compact Disc-Recordable
• SMPS – Switch Mode Power Supply
• ISA – Industry Standard Architecture
• PCI – Peripheral Component Interconnect
• AGP – Accelerated Graphics Port
• ATX – Advanced Technology Extended
• LPT1 – Line Printer 1
• COM1 – Communications Port 1
• FDD – Floppy Disk Drive
• DIMM – Dual In-line Memory Module
• SCSI – Small Computer System Interface
• EIDE – Enhanced Integrated Drive Electronics
• RJ-11 – Registered Jack 11
• RJ-45 – Registered Jack 45
• BITS – Binary Digits
• USB – Universal Serial Bus
• DDR SDRAM – Double Data Rate Synchronous Dynamic RAM
• UPS – Uninterruptible Power Supply
• MIPS – Million Instructions Per Second
• EMI – Electromagnetic Interference
• ESD – Electrostatic Discharge
• NIC – Network Interface Card
• HDMI – High-Definition Multimedia Interface
• PPM – Pages Per Minute
• ADC – Analog to Digital Converter

14. NETWORKING

• DSL – Digital Subscriber Line
• LAN – Local Area Network
• WAN – Wide Area Network
• FTP – File Transfer Protocol
• HTTP – Hypertext Transfer Protocol
• SNMP – Simple Network Management Protocol
• POP – Post Office Protocol
• VPN – Virtual Private Network
• IPv4 – Internet Protocol version 4
• PPTP – Point-to-Point Tunneling Protocol
• L2TP – Layer 2 Tunneling Protocol
• PPP – Point-to-Point Protocol
• EIA/TIA – Electronic Industries Alliance/Telecommunications Industry Association
• ARP – Address Resolution Protocol
• RARP – Reverse Address Resolution Protocol
• DNS – Domain Name System
• LED – Light Emitting Diode
• LASER – Light Amplification by Stimulated Emission of Radiation
• PAN – Personal Area Network
• OSI – Open Systems Interconnection
• TCP/IP – Transmission Control Protocol/Internet Protocol
• IPX – Internetwork Packet Exchange
• MAC – Media Access Control
• IP – Internet Protocol
• MAN – Metropolitan Area Network
• WiMAX – Worldwide Interoperability for Microwave Access
• OFDM – Orthogonal Frequency Division Multiplexing
• DHCP – Dynamic Host Configuration Protocol
• DNS – Domain Name System
• URL – Uniform Resource Locator
• B2C – Business to Consumer
• B2B – Business to Business
• C2C – Consumer to Consumer
• VLAN – Virtual Local Area Network
• Mbps – Megabits per second
• HTTPS – Hypertext Transfer Protocol Secure
• ISP – Internet Service Provider

15. INTERNET

• WWW – World Wide Web
• FTP – File Transfer Protocol
• IP – Internet Protocol
• Wi-Fi – Wireless Fidelity
• G-mail – Google Mail
• E-commerce – Electronic Commerce
• E-business – Electronic Business
• E-marketing – Electronic Marketing
• E-procurement – Electronic Procurement
• URL – Uniform Resource Locator
• IE – Internet Explorer
• ARPANET – Advanced Research Projects Agency Network
• ISP – Internet Service Provider
• TCP/IP – Transmission Control Protocol/Internet Protocol
• HTML – Hypertext Markup Language
• XML – Extensible Markup Language
• IRC – Internet Relay Chat
• WAIS – Wide Area Information Servers
• RAS – Remote Access Service
• ISDN – Integrated Services Digital Network
• DSL – Digital Subscriber Line
• VPN – Virtual Private Network
• DMS – Document Management System

16. WEBMAIL & SELO

• VPN – Virtual Private Network
• RSA – Rivest–Shamir–Adleman (Cryptography)
• AD – Active Directory
• DMS – Document Management System
• MB / MBPS – Megabyte / Megabits per second
• KB – Kilobyte
• SELO – Service and Loyalty
• PIS – Personnel Information System
• DSS – Decision Support System
• SQL – Structured Query Language
• IP – Internet Protocol
• AMC – Annual Maintenance Contract
• TA/DA – Travel Allowance/Dearness Allowance

17. COMPUTER VIRUS

• DDE – Dynamic Data Exchange
• NAV – Norton Antivirus

18. DATA COMMUNICATION

• FDM – Frequency Division Multiplexing
• TDM – Time Division Multiplexing
• WDM – Wave Division Multiplexing
• RF – Radio Frequency
• PCM – Pulse Code Modulation
• PAM – Pulse Amplitude Modulation
• PWM – Pulse Width Modulation
• PPM – Pulse Position Modulation
• PFM – Pulse Frequency Modulation
• FM – Frequency Modulation

19. DIGITAL PRINCIPLE

• MSD – Most Significant Digit
• TTL – Transistor-Transistor Logic
• CMOS – Complementary Metal–Oxide–Semiconductor
• LSI – Large-Scale Integration
• NMOS – N-type Metal-Oxide-Semiconductor
• JK FF – Jack Kilby Flip-Flop
• SR FF – Set-Reset Flip-Flop
• D FF – Data Flip-Flop
• T FF – Toggle Flip-Flop
• ECL – Emitter-Coupled Logic
• DTL – Diode–Transistor Logic
• I2L – Integrated Injection Logic
• SISO – Serial-In Serial-Out
• PISO – Parallel-In Serial-Out
• SIPO – Serial-In Parallel-Out
• PIPO – Parallel-In Parallel-Out
• ASCII – American Standard Code for Information Interchange
• BCD – Binary Coded Decimal
• ADC – Analog to Digital Converter
• DAC – Digital to Analog Converter

🔴 TOP PRIORITY –

1. CPU – Central Processing Unit
2. RAM – Random Access Memory
3. ROM – Read Only Memory
4. BIOS – Basic Input Output System
5. OS – Operating System
6. LAN – Local Area Network
7. WAN – Wide Area Network
8. URL – Uniform Resource Locator
9. HTML – Hypertext Markup Language
10. HTTP – Hypertext Transfer Protocol
11. FTP – File Transfer Protocol
12. TCP/IP – Transmission Control Protocol/Internet Protocol
13. PDF – Portable Document Format
14. USB – Universal Serial Bus
15. VGA – Video Graphics Array

🟠 HIGH PRIORITY – Frequently Asked:

16. ALU – Arithmetic Logic Unit
17. CD – Compact Disc
18. DVD – Digital Versatile Disc
19. HDD – Hard Disk Drive
20. SMPS – Switch Mode Power Supply
21. UPS – Uninterruptible Power Supply
22. LCD – Liquid Crystal Display
23. LED – Light Emitting Diode
24. CRT – Cathode Ray Tube
25. ASCII – American Standard Code for Information Interchange
26. ISP – Internet Service Provider
27. Wi-Fi – Wireless Fidelity
28. WWW – World Wide Web
29. SQL – Structured Query Language
30. DBMS – Database Management System

🟡 MEDIUM PRIORITY – Important but Less Frequent:

31. PROM – Programmable Read Only Memory
32. EPROM – Erasable Programmable Read Only Memory
33. DRAM – Dynamic RAM
34. SRAM – Static RAM
35. BCD – Binary Coded Decimal
36. MIPS – Million Instructions Per Second
37. OCR – Optical Character Recognition
38. OMR – Optical Mark Recognition
39. POS – Point of Sale
40. RISC – Reduced Instruction Set Computer
41. VPN – Virtual Private Network
42. DNS – Domain Name System
43. MAC – Media Access Control
44. IP – Internet Protocol
45. PAN – Personal Area Network

🔵  EXAMS KE LIYE IMPORTANT:

46. COBOL – Common Business Oriented Language (Computer Officer)
47. FORTRAN – Formula Translation (Scientific exams)
48. BASIC – Beginner’s All-purpose Symbolic Instruction Code
49. SATA – Serial Advanced Technology Attachment (Technical posts)
50. PCI – Peripheral Component Interconnect (Technical)

🔴 CRPF SPECIFIC – Ye Zaroor Yaad Rakhein:

1. CRPF – Central Reserve Police Force
2. SELO – Service and Loyalty
3. VPN – Virtual Private Network
4. DMS – Document Management System
5. PIS – Personnel Information System
6. DSS – Decision Support System
7. AD – Active Directory
8. RSA – Rivest–Shamir–Adleman (Token system)
9. AMC – Annual Maintenance Contract
10. TA/DA – Travel Allowance/Dearness Allowance
11. SAMBHAV – SELO Application Mobile Availability
12. PPMS – PAPERLESS PROCESS MANAGEMENT SYSTEM
13. APAR – ANNUAL PERFORMANCE ASSASMENT REPORT
14. CLMS -CENTRALISED LIQUOR MANAGEMENT SYSTEM
15. PRAN- PERMANENT RETIREMENT ACCOUNT NUMBER
16. SAATHI – SEED TRACEABILITY, AUTHENTICATION AND HOLISTIC INVENTORY
17. PIMS – PERSONNEL INFORMATION MANAGEMENT SYSTEM
18. KMS – KNOWLEDGE MANAGEMENT SYSTEM
19. NIC – NATIONAL INFORMATION CENTER

📘 ELECTRONICS & SEMICONDUCTORS

1. LED – Light Emitting Diode
2. BJT – Bipolar Junction Transistor
3. IC – Integrated Circuit
4. FET – Field Effect Transistor (not directly in PDF but related)
5. CMOS – Complementary Metal-Oxide-Semiconductor (not directly in PDF but related)

🔌 ELECTRICAL & INSTRUMENTS

6. AC – Alternating Current
7. DC – Direct Current
8. PMMC – Permanent Magnet Moving Coil (type of instrument)
9. KCL – Kirchhoff’s Current Law
10. KVL – Kirchhoff’s Voltage Law
11. VSWR – Voltage Standing Wave Ratio
12. AGC – Automatic Gain Control
13. PCM – Pulse Code Modulation
14. ADC – Analog to Digital Converter
15. DAC – Digital to Analog Converter (not directly in PDF but related)

📡 COMMUNICATION SYSTEMS

16. AM – Amplitude Modulation
17. FM – Frequency Modulation
18. PM – Phase Modulation
19. MODEM – Modulator-Demodulator
20. RF – Radio Frequency
21. IF – Intermediate Frequency
22. PLL – Phase Locked Loop
23. ASK – Amplitude Shift Keying
24. PSK – Phase Shift Keying
25. QPSK – Quadrature Phase Shift Keying
26. FSK – Frequency Shift Keying
27. GSM – Global System for Mobile Communications
28. CDMA – Code Division Multiple Access
29. TDMA – Time Division Multiple Access
30. FDMA – Frequency Division Multiple Access
31. VSAT – Very Small Aperture Terminal
32. HTTP – HyperText Transfer Protocol
33. TCP/IP – Transmission Control Protocol / Internet Protocol
34. SMTP – Simple Mail Transfer Protocol
35. FTP – File Transfer Protocol
36. DNS – Domain Name System
37. VPN – Virtual Private Network
38. WiFi – Wireless Fidelity
39. LAN – Local Area Network
40. WAN – Wide Area Network

🔧 CONTROL SYSTEMS & MEASUREMENTS

41. PID – Proportional Integral Derivative (Controller)
42. BIBO – Bounded Input Bounded Output
43. ZOH – Zero Order Hold
44. LVDT – Linear Variable Differential Transformer
45. BOD – Biochemical Oxygen Demand (Environmental Science)
46. LASER – Light Amplification by Stimulated Emission of Radiation
47. LCD – Liquid Crystal Display (not in PDF but related)

⚡ POWER SYSTEMS

48. HVAC – High Voltage Alternating Current
49. HVDC – High Voltage Direct Current
50. UPS – Uninterruptible Power Supply

🧠 MODERN PHYSICS & COMPUTING

51. CPU – Central Processing Unit
52. RAM – Random Access Memory
53. ROM – Read Only Memory
54. HTTP – HyperText Transfer Protocol (repeated for emphasis)
55. URL – Uniform Resource Locator
56. HTML – HyperText Markup Language