Practice Question (Gate 1993)

Duration: 3 min

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Module outline

  1. Paper 1 | Reasoning Test: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Puzzle Solving (Puzzles), Venn Diagram, Analogy, Ranking, Order and Sequence, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Selection Decision Table (Decision Making), Logical Sequence Of Words, Cubes & Dices, Analytical Reasoning (Counting Figures Reasoning), Calendar, Alphabet and Word Tests, Numerical Reasoning, Number System, Averages, Mixtures and Alligation, Percentages, Series Completion, Analogy and Classification, Patterns in Two-Dimensional Figures, Coding and Decoding, Mathematical Operations, Direction Sense, Algebra, Logical Deduction and Induction, Syllogisms and Venn Diagrams, Critical Reasoning, Order, Ranking and Sequence, Reading Comprehension, Profit, Loss and Discount, Constraint Puzzles, Speed, Time and Distance, Traverse Surveying, Ratio and Proportion, Time and Work, Mensuration, Permutations and Combinations, Clocks and Calendars, Data Interpretation, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Cubes and Dice, Vocabulary, Blood Relations, Data Sufficiency
  2. Paper 1 | Numerical Analysis: Number System, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Sequence and Series (Series), Powers and Exponents (Surds and Indices), Algebra, Statistics, Data Interpretation, Mental Ability, Arithmetic, Logarithm, Profit and Loss, Simple Interest and Compound Interest, Speed Time and Distance, Mixture and Alligation, Mensuration and Geometry, Permutation and Combination, Probability, Sequences and Series, Powers, Surds and Logarithms, Subject-Verb Agreement, Sentence Completion, Geometry, Sentence Structure and Correction, Data Sufficiency, Trigonometry, Measurement and Quantity Take-Off, Signal Space and Optimum Detection, Probability, Statistics, Algebra, Time and Work, Speed, Time and Distance, Data Interpretation, Graph Theory, Combinatorics
  3. Paper 1 | General Knowledge: State Wise GK, History, Geography, GK- Current Affairs, Static General Knowledge, Polity, Indian Economy
  4. Paper 1 | DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control, Relational Calculus, Database Security & Authorization, Database Recovery
  5. Paper 1 | Data Communication & Network: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Network Security, Security in Mobile and Wireless Computing, Input Output Organisation, File Management, Hardware Basics, Terms & Abbreviations, Protocols & Services, Network Access Technologies, Cyber Safety and Security, Basics of COA
  6. Paper 2 | System Analysis & Design: Fundamentals of Systems and Information Systems, SDLC and Development Approaches, Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, Security, Risk Management & Maintenance, extras
  7. Paper 2 | Programming Language (Java): Java Fundamentals, OOPS with Java, Array, String, IO & References, Generic & Collections, Multithreading, Java, Miscellaneous, Control Flow, OOPS with C++, Stack, C Fundamentals, Arrays & Pointers, Object Oriented Technology, Control Flow & Looping, Introduction to Python
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a detailed walkthrough of a GATE 1993 computer organization problem involving moving arm disk storage. The instructor systematically breaks down the given specifications to calculate two key performance metrics: average latency (P) and data transfer rate (Q). The lecture focuses on converting units and applying standard formulas for disk access time and throughput.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The session begins with the instructor reading the problem statement displayed on the screen. He lists the specifications: 'Number of tracks/recording surface = 200', 'Disk rotation speed = 2400 rpm', and 'Track storage capacity = 62,500 bits'. He underlines the target variables, 'average latency' and 'data transfer rate'. He starts the calculation by converting the rotation speed from rpm to rotations per second, writing '2400 / 60' on the board. This yields 40 rotations per second. Consequently, he calculates the time for one full rotation as 1/40 seconds. To make this more readable, he converts the time into milliseconds by multiplying by 1000, resulting in '25 ms' for one full rotation.

  2. 2:00 – 2:40 02:00-02:40

    The instructor proceeds to find the average latency, explaining that it is half the time of one full rotation. He writes '12.5 ms' on the board, identifying this as the value for P. Next, he tackles the data transfer rate (Q). He establishes a relationship where 25 ms corresponds to the transfer of 62,500 bits. To find the rate per second, he sets up a proportion: 1 second corresponds to (62,500 / 25) * 1000 bits. He performs the division 62,500 / 25 to get 2,500, and then multiplies by 1000 to get 2,500,000. He writes the final answer as '= 2.5 x 10^6 b/s', completing the calculation for Q.

The video effectively demonstrates how to derive disk performance parameters from basic physical specifications. By first determining the rotational period, the instructor establishes the foundation for calculating both latency and transfer rates. The step-by-step board work clarifies unit conversions between seconds and milliseconds, ensuring students understand the magnitude of the values involved. This methodical approach is crucial for solving similar problems in computer architecture exams.

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