Notes, summaries, assignments, exams, and exercises for Technology for University

1. Injection Molding

Injection molding is a plastic-shaping process in which molten plastic is injected under high pressure into a mold cavity, where it cools and solidifies to take the shape of the mold.

Construction Components

• Hopper: Funnel-shaped container at the top of the barrel; feeds plastic pellets.
• Barrel: Thin-walled cylinder housing the screw; features multiple heating zones.
• Screw: Comprises three zones—feed, compression, and metering; moves axially.
• Non-return valve: Fitted at the top of the screw.
• Nozzle: Connects the barrel to the mold; controls the flow.
• Cylinder for screw ram: Pushes the screw forward during the injection stroke.
• Stationary platen: Fixed mold-half section.
• Movable platen: Moves forward and backward along the rods

a) Microkernel Architecture

• A microkernel is an OS architecture where only essential functions (like process management, memory management, and inter-process communication) run in kernel mode.

• Other services (like device drivers, file systems, etc.) run in user mode.

• Advantage: More stable and secure; easier to maintain.

• Disadvantage: Can be slower due to more user-kernel interactions.

b) Data Backup Strategies

• Strategies used to safeguard data from loss or corruption.

• Types:

  • Full Backup: Copies all data.

  • Incremental Backup: Copies only data changed since the last backup.

  • Differential Backup: Copies changes since the last full backup.

• Best practice: Use the 3-2-1 rule – 3 copies, 2 media types, 1 offsite.

c) Auditing in Windows 2000

• Auditing tracks user

Fuel Injection Systems

Continued and Timed Injection Systems

• Continued Injection: Delivers fuel continuously into the intake manifold, regardless of the engine cycle.
• Timed Injection: Synchronizes fuel delivery with the intake stroke of each cylinder for better efficiency and combustion control.

Piston Ring Functions

Primary Roles of Piston Rings

1. Seal the combustion chamber to prevent gas leakage.
2. Control oil consumption by scraping excess oil from the cylinder walls.
3. Transfer heat from the piston to the cylinder wall.

Racing Engine Preference

Petrol engines are favored in racing because they are lighter, provide a higher power-to-weight ratio, and offer faster throttle response, which is ideal for high-speed performance.

Single Plate Clutch Torque Parameters

Factors

Classification of Heating Hot Water Distribution System Function Adopted

Bitubular Distribution

It is characterized by the existence of two tubes, one for supply and a return, mounted in parallel. This ensures a uniform water temperature. The power of the radiators can be achieved by uprights or anillos.

Monotubular Distribution

The entire set of pipes and radiators is bound by a single distribution pipe for hot water to form a closed circuit. The water passes through all the radiators, decreasing in temperature as it moves towards the final radiator anillo.

Radiant Heating Systems

Radiant heating systems operate at temperatures between 25 to 35 ºC, radiating heat from the bottom up evenly.

Function of the Expansion Tank

What is the function of the

Network Infrastructure Cables

2 Power Cords (Mains)

These stem from the main network cables and connect to distribution poles, manholes, or building facades. These cables are distributed through adequate piping. They run via interspersed small underground pipes and accessible local street access points called chambers. This set of power cables is called the mains.

3 Distribution Cables

This is the network of branches feeding through lateral paths using lower capacity cables. This set is called the distribution network. These network cables, in turn, divide and end at interconnection points, from which the various subscriber lines originate.

These interconnection points are of two types:

• If they are outdoors and contain a small number of pairs, they

Data Modeling Concepts: True or False

• False: ProcessAnalyst typically focuses on business process modeling, not primarily on designing detailed entity-relationship models.
• False: An analyst's concerns extend beyond just designing an information system; they include requirements gathering, process analysis, and more.
• False: Referential integrity is a rule ensuring consistency between related tables, typically involving primary and foreign keys, not governing general data types within attributes.
• True: A domain is a constraint that governs the permissible data types and values for an attribute.
• True: An occurrence (or instance) of an entity is uniquely identified by a primary key.
• True: A Data Architect initiates the process by building a conceptual

Introduction

Network flow techniques are aimed at optimizing situations related to transport networks, communication networks, the system of flights at airports, shipping routes for cruise lines, pumping stations that carry fluids through pipes, road networks between towns, pipe systems, and all situations that may be represented by a network. In such a network, nodes represent stations or towns and arcs (or edges) represent roads, airlines, cables, or pipes; the flow is represented by trucks, messages, or fluids moving through the network. These methods are used to find the shortest route in a road network or to send the maximum flow in a pipe network.

Network Models

The network optimization problems can be broadly represented by one of these...

First Normal Form: Eliminating Repeating Groups

To achieve First Normal Form (1NF), you must remove repetitive groups. This process involves two main steps:

• Repeating groups must generate a new relationship that contains the primary key of the original relationship as an attribute, alongside fields that have no repeating groups.
• Form a composite key consisting of the primary key from the original relationship and the key attributes of the repeating group, including all fields that make up the repeating group.

Second Normal Form: Removing Partial Dependencies

To achieve Second Normal Form (2NF), you must remove partial dependencies. This requires:

1. Identifying a composite key and the attribute fields that depend solely on a portion of it.
2. Creating a

UNIT-01

3Q.1. Classification of Buildings as per National Building Code (NBC:2005, Part 3).

Ans:-1)Meaning: Classification of buildings means grouping them according to their use or occupancy so that planning, structural, fire-safety and service requirements can be fixed for each group.

2)Basis: NBC 2005 (Part 3 - Development Control Rules and General Building Requirements; Part 4 - Fire and Life Safety) classifies buildings by occupancy into nine groups lettered A to J.

3)Group A - Residential: lodging or rooming houses, one/two-family dwellings, dormitories, apartment houses, hotels. Examples: bungalow, flats, hostel, hotel.

4)Group B - Educational: schools, colleges, universities, training institutes and day-care centres where instruction is...

Open Cycle OTEC

Warm seawater is the working fluid.

The warm seawater is "flash"-evaporated in a vacuum chamber to produce steam at an absolute pressure of about 2.4 kilopascals.

The steam expands through a low-pressure turbine that is coupled to a generator to produce electricity.

The steam exiting the turbine is condensed by cold seawater pumped from the ocean's depths through a cold-water pipe.

If a surface condenser is used in the system, the condensed steam remains separated from the cold seawater, resulting in a supply of desalinated water.

Closed Cycle OTEC

• Warm seawater vaporizes a working fluid, such as ammonia, flowing through a heat exchanger (evaporator).
• The vapour expands at moderate pressures and turns a turbine coupled to a generator