Electrical Workshop SEC 1 Manual

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Questions and Answers

What is the purpose of preparing a single line circuit diagram for staircase wiring using 2-way switches?

To understand the layout of electrical components in a building. (correct)

To practice the installation of low tension conductors.

To learn about power generation techniques.

To evaluate the cost of a residential wiring project. (correct)

Which of the following components is NOT typically studied in relation to Low Tension (LT) electrical systems?

Inductors

Switches

Fuses

Transformers (correct)

Which electrical symbol representation is associated with a 'Switch'?

Thermistor

SPST Toggle Switch (correct)

Capacitor

Inductor

In measuring Lumen, what is primarily determined in the context of lamps?

The brightness output. Signup and view all the answers

Which term describes a type of resistor that can adjust its resistance value?

Trimmer Resistor Signup and view all the answers

What kind of wiring project involves evaluating the total cost with all electrical fixtures?

Implementation of a bed switch wiring. Signup and view all the answers

Which conductor type is explored in the laboratory experiments listed?

LT conductors Signup and view all the answers

What is the primary purpose of constructing electrical wiring on a wooden board during the experiments?

To provide a safe platform for experimentation. Signup and view all the answers

What is the minimum recommended number of layers of tape for insulation according to the rule of thumb?

Two half-lapped layers or 1.5 times the thickness Signup and view all the answers

Which type of cable is most commonly used for low tension (LT) distribution?

PVC armored cables Signup and view all the answers

What is one key characteristic of the insulation process when applying tape?

Stretching the tape while applying provides better protection Signup and view all the answers

What defines a Low Tension (LT) cable?

Cables having a voltage level below 1.1kV Signup and view all the answers

What is the primary reason tungsten is used in incandescent bulbs?

It has a very high melting point. Signup and view all the answers

What is a disadvantage of using Vulcanized Indian Rubber (VIR) cables?

They have a high Sulphur content that can corrode copper. Signup and view all the answers

Which of the following statements about fluorescent lamps is true?

They require a special electronic ballast for operation. Signup and view all the answers

What is a disadvantage of using incandescent bulbs compared to fluorescent lamps?

Lower energy efficiency. Signup and view all the answers

Which type of cable is typically used for high tension (HT) networks?

PILC and XLPE cables Signup and view all the answers

Which of the following is NOT a method of classifying cables?

Based on color coding Signup and view all the answers

What mechanism do fluorescent lamps use to produce light?

Excitation of electrons in an ionized gas. Signup and view all the answers

What is the purpose of wrapping tape at 75% of its width?

To provide effective insulation protection Signup and view all the answers

What characterizes the CRI of compact fluorescent lamps (CFLs)?

Poor CRI values. Signup and view all the answers

Which of these is NOT a component of a Compact Fluorescent Lamp (CFL)?

A tungsten filament. Signup and view all the answers

What is the primary function of the latch in an MCB?

To stop the current flow in the circuit Signup and view all the answers

What is the energy dissipation characteristic of incandescent bulbs?

More than 95% dissipated as heat. Signup and view all the answers

Which type of MCB is designed to protect a single phase and neutral?

Double-pole MCB Signup and view all the answers

What is a common application for fluorescent lamps?

Widely used in commercial buildings and offices. Signup and view all the answers

For room one with a total load of 7.5 amperes, which MCB should be selected?

10 ampere MCB Signup and view all the answers

What is the most common unit of measurement in radiometry?

Watts Signup and view all the answers

How many switches are found in a three-pole MCB?

Three switches Signup and view all the answers

Which unit measures luminous flux?

Lumen Signup and view all the answers

How is luminous efficacy defined?

Luminous flux per watt of electrical power Signup and view all the answers

Which of the following applications is least likely to use an MCB?

Automotive wiring systems Signup and view all the answers

What type of MCB would be most suitable for a facility with an unbalanced circuit?

Four-pole MCB Signup and view all the answers

Which device is used to measure luminous flux?

Lumen meter Signup and view all the answers

What wavelength corresponds to the highest sensitivity of human eyes?

555 nm Signup and view all the answers

An electrical fuse is primarily used to protect against what?

Excessive current Signup and view all the answers

What is the minimum rated ampere for commercial MCBs mentioned?

6 amps Signup and view all the answers

What is luminous efficiency expressed in?

Percentage Signup and view all the answers

What material coats the inside of a photometric integrating sphere?

Barium sulphate Signup and view all the answers

What characteristic does the fiber in a photometric integrating sphere have?

Maintains temperature uniformity Signup and view all the answers

What key components are necessary for constructing a fluorescent tube light?

Lime glass tube, mercury, argon gas, phosphor coating Signup and view all the answers

What is a primary advantage of LED light bulbs over other types of lighting?

High luminous efficacy and low power consumption Signup and view all the answers

Which type of fan speed regulator works by providing taps on a wire wound resistor?

Resistive regulator Signup and view all the answers

What is a disadvantage of phase angle-controlled regulators?

Produces a humming sound and causes EMI/RFI interference Signup and view all the answers

How does an inductive regulator achieve speed variation in a fan?

By varying the inductive reactance through tapping on the transformer's winding Signup and view all the answers

Which component is NOT required for the setup of a fluorescent lamp?

PN Junction Diode Signup and view all the answers

What factor contributes to the inefficiency of resistive regulators in fan speed control?

Considerable power loss as heat at lower speeds Signup and view all the answers

What principle do LEDs operate on to emit light?

Electro-luminescence Signup and view all the answers

Study Notes

Laboratory Manual

Course: Skill Enhancement Course (1st Semester)
Laboratory: Electrical Workshop (SEC 1)
Part: I
Department: Electrical Engineering
University: Delhi Technological University
Date: August 2023

List of Experiments (Part I)

Experiment 1: Prepare a single line circuit diagram for staircase wiring using 2-way switches, bill of materials, build up electrical wiring on a wooden board, and evaluate the total cost including fixtures.
Experiment 2: Prepare a single line circuit diagram for bed switch wiring using 1-way switches, bill of materials, build up electrical wiring on a wooden board, and evaluate the total cost including fixtures.
Experiment 3: Study various Low Tension (LT) MCBs, fuses, switches, lamps (LED tube light, bulbs, regulators, electrical fixtures, variac), and explore their limitations.
Experiment 4: Study different types of LT conductors and SWG cables.
Experiment 5: Measure the lumen of various lamps.

Electrical Symbols

A list of electrical symbols with their names and corresponding symbols is included. The table lists symbols for electrical wires, connected/disconnected wires, switches, relays, jumpers, various resistor types, potentiometers, and more. Each symbol has a corresponding number in the table.

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Description

This laboratory manual for the Skill Enhancement Course covers various experiments in the Electrical Workshop. Students will learn to create circuit diagrams, evaluate costs, and study components such as MCBs and conductors. This hands-on experience is crucial for understanding foundational electrical engineering concepts.