Notes, summaries, assignments, exams, and problems for Other courses

Kirchhoff’s Current Law (KCL)

Statement:

At any junction (node) in an electrical circuit, the algebraic sum of currents is zero

∑ I=0

Explanation:

• At a junction, current cannot accumulate.

• Therefore, the total current entering must be equal to the total current leaving.

Example:
If currents I1I_1I1​ and I2I_2I2​ enter a node and I3I_3I3​ and I4I_4I4​ leave:     I1​+I2​=I3​+I4​  

2) Kirchhoff’s Voltage Law (KVL)

Statement:

In any closed loop of an electrical circuit, the algebraic sum of all voltages is zero.

∑V=0

Explanation:

• While moving around a closed loop, the sum of voltage rises equals the sum of voltage drops.

• This law is based on the conservation of energy.

Example:
For a loop with a source EEE and voltage drops V1​,V2​:... Continue reading "For an aeroplane hydraulic supply circuit, the correct statement is :" »

Shanghai Cooperation Organization Principles

The Shanghai Cooperation Organization (SCO) is guided by the “Shanghai Spirit”, which emphasizes the sovereign equality of states, non-interference in internal affairs, consensus-based decision-making, mutual trust and respect, non-alignment, and the rejection of military blocs.

Its overarching goals are to maintain regional stability, strengthen cooperation, and contribute to a multipolar and non-Western-centric international order. These principles explain both the SCO’s attractiveness to many states and its limited capacity for enforcement.

SCO Membership and Structure

The organization includes nine full members: China, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, India, Pakistan,... Continue reading "SCO and Council of Europe: Principles and Frameworks" »

Essential Python String Manipulation Methods

1. strip()

• Purpose: Removes any leading (start) and trailing (end) whitespace or specified characters from a string.
• Example: " hello ".strip() → "hello"
• Use Case: Useful for cleaning input data.

2. ljust(width)

• Purpose: Left-justifies the string in a field of given width, padding with spaces on the right.
• Example: "Hi".ljust(5) → "Hi "
• Use Case: Formatting output neatly.

3. rindex(substring)

• Purpose: Returns the last occurrence index of the given substring in the string. Raises an error if the substring is not found.
• Example: "hello world".rindex("o") → 7
• Use Case: Finding positions of characters or words starting from the end of the string.

4. isspace()

• Purpose: Returns True if the string contains

Raja Ram Mohan Roy: Father of Modern India

Raja Ram Mohan Roy, known as the Father of Modern India, was the earliest leader of India’s social and intellectual awakening in the 19th century. He fought against major social evils such as:

• Sati
• Child marriage
• Polygamy
• Caste rigidity
• Superstition

He used rational ideas and reinterpretation of ancient texts to drive change. Roy promoted women’s rights, especially widow protection and female education, and strongly supported freedom of speech and the press.

Brahmo Samaj Foundation

In 1828, he founded the Brahmo Samaj, which preached monotheism, rejected idol worship, opposed ritualism, and encouraged moral and spiritual reform. Roy also played an important role in shaping modern education by supporting... Continue reading "Raja Ram Mohan Roy and Lord Bentinck: Social and Administrative Reforms in India" »

Q1. Inheritance in Java (10 Marks)

Inheritance is an important feature of object-oriented programming that allows one class to acquire the properties and methods of another class. The class that gives its features is called the parent class or superclass, and the class that receives them is called the child class or subclass. In Java, inheritance is implemented using the extends keyword.

There are three main types of inheritance in Java:
(1) Single-level inheritance – one parent and one child class.
(2) Multilevel inheritance – one class inherits another, and another class further inherits it.
(3) Hierarchical inheritance – one parent class is inherited by multiple child classes.

Java does not support multiple inheritance using classes to... Continue reading "Core Java Concepts: Inheritance, Polymorphism & OOP" »

Domain Model

• Shows concepts only: classes, attributes, associations, and multiplicities.
• No methods, no UI, and no controllers are included.
• Purpose: To understand the real-world objects involved in the system.

Use Case Model (Module 6)

• Focuses on Actor ↔ System interaction.
• Uses the Verb + Noun naming convention.
• Format: Defines Actor steps versus System steps.
• Use cases serve as input for sequence diagrams, which inform class diagrams.

UML Class Diagram (Module 7)

• Class Components: Name, attributes, and methods.
• Association: Line connecting classes with multiplicity (1, 0..1, *, 1..*).
• Inheritance: Represented by an open triangle arrow symbol.
• Interface: Indicated by the «interface» stereotype.
• DCD (Design Class Diagram): Explicitly includes methods

Speech to Text (STT):

Def: A Speech-To-Text (STT) or Automatic Speech Recognizer (ASR) system transforms a speech recording input into an output text that contains, word by word, what is said in the recording. EJEMPLO: raw audio -> STT -> (we are learning about speech to text)

We can describe the problem as Sequence labelling: This means the computer receives a continuous sequence of data (the audio waves shown in the image) and has to assign discrete "labels" (words or letters) to parts of that sound. 

Sequence-to-Sequence Mapping: This is a more general term. It simply means mapping one type of sequence (audio) to another type of sequence (text).

STT EVALUATION:

STT Systems Make Mistakes so before evaluating, we must accept that these systems... Continue reading "audio2_siaprueb" »

What is a Microcontroller?

A microcontroller (MC, uC, or μC), also known as a microcontroller unit (MCU), is a small computer on a single integrated circuit. A microcontroller contains one or more processor cores along with memory and programmable input/output (I/O) peripherals.

Microprocessor Core Functions

The core directs all operations of the microprocessor:

• Instruction Handling: It fetches instructions from memory, decodes them, and sends signals to other units.
• Role: Think of it as the “manager” of the microprocessor.

Arithmetic and Logic Unit (ALU)

The ALU performs mathematical operations (addition, subtraction, etc.) and logical operations (AND, OR, NOT). It acts as the “calculator” part of the microprocessor.

Registers

Registers are... Continue reading "Understanding Microcontrollers: Architecture and Functions" »

This document provides a detailed, exam-ready note sheet covering essential topics in digital electronics, including key points, formulas, comparisons, and revision tips. The content is structured for quick and effective study.

R-2R Digital-to-Analog Converter (DAC)

Definition:
A digital-to-analog converter that converts a binary input to an analog voltage using only R and 2R resistors. This design is common in ICs due to its simplicity and accuracy.

Operation:

• Each bit controls a switch connecting to Vref (1) or GND (0).
• The ladder network ensures each bit contributes a weighted current.
• Output voltage formula:

V_{out} = V_{ref} \times \frac{D}{2^n} \quad (D = \text{decimal equivalent of input})

Advantages:

• Only two resistor values, simplifying IC fabrication.