Remote control motor car

CONSTRUCT ELECTRICAL REMOTE CONTROL MOTOR CAR | PROJECT WRITE-UP

CONSTRUCTION OF ELECTRICAL REMOTE CONTROL MOTOR CARPREPARED BY: Soyombo oluwajuwonlo gabriel 2018702030240Sangodoyin ajibola mujeeb 2018702030237Sowunmi sunday Joseph 2018702030239Sunmonu akinkunmi quadri 2018702030241Fadare temitayo Lawrence. 2018702030121Oyelabi Timileyin Samuel. 2016070203234 A PROJECT REPORT SUBMITTED OF ELECTRICAL ENGINEERING IN PARTIAL FULFILLMENT FOR THE AWARD OF NATIONAL DIPLOMAFACULTY OF ENGINEERINGTHE POLYTECHNIC IBADAN MARCH, 2021. AUTHENTICATION I hereby certify that this […]

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EEC 111 | IMPORTANT TERMS IN ELECTRICAL GRAPHICS

What is receptacle and Block diagram in Electrical graphics What is receptacle in electrical graphics: Receptacle is an opening of series of opening connected to a wired power source that is supposed to power electrical components and equipment.BLOCK DIAGRAM: Is a kind of electrical drawing that represent the principle components of a complex system in

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A series circuit having R= 40 ohm, and inductance of 0.3H suddenly connected across a 150V supply through a switch. Find;

A series circuit having R= 40 ohm, and inductance of 0.3H suddenly connected across a 150V supply through a switch. Find; I. The rate of change of current after closing the switch II. The steady state value of the current. III. The the rate of change of current I(t) = V/R – V/R . 1.

A series circuit having R= 40 ohm, and inductance of 0.3H suddenly connected across a 150V supply through a switch. Find; Read More »

WHAT’S THE FUNCTION OF FOCUS ADJUSTMENT AND ELECTROSTATIC FOCUSING IN TELECOMMUNICATION II

WHAT’S THE FUNCTION OF FOCUS ADJUSTMENT AND ELECTROSTATIC FOCUSING IN MONOCHROME TV The domestic television receiver is required to receive signal over a wide bandwidth and is based on the superheterodyne principle.The television receiver is more complicated than a broadcast radio receiver because the former is required to reproduce a video signal, synchronized scanning waveform

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Calculate the power generated by a station which has a head of 300m, a flow rate of 63000kg/s and an overall efficiency of 75% (4 marks)

acceleration due to gravity= 9.81m/s2 Head= 300m Efficiency rate= 75% Velocity= 63000kg/s P= ghrv P = acceleration due to gravity × Head × Efficiency rate × Velocity P = 9.81 × 300 ×  × 63000     =139,056,750      = 140MN

Calculate the power generated by a station which has a head of 300m, a flow rate of 63000kg/s and an overall efficiency of 75% (4 marks) Read More »

Advantages and disadvantages of hydroelectric energy and nuclear power energy

2011/2012 list five (3) advantages and three (3) disadvantages of a hydro power plant. Answers(1) Renewable: hydro-electric energy is renewable, that means hydro-electric energy can be generated again after been used up. However, there’s only a limited number of suitable reservoirs where hydro-electric power plants can be built and even less places where such projects

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Different types of Network and their meaning in computer Network

WIDE AREA NETWORK WAN]:Wide area networking combines multiple LANs that are geographically separate. This is accomplished by connecting the different LANs using services such as dedicated leased phone lines, dial-up phone line (both synchronous and asynchronous), satellite link, and data packet carrier services. It can be as simple as a modem and remote access server

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Electrical machine course

Things to know in Electrical Machine Course (EEC 323)

What are the different special purpose of transformer? You can use transformer as; What is reactor? Reactors are equipment of transformer family. Reactors are used in the power system(network) for current limiting and for compensation of reactive power. Types of reactors What is transformer? Transformer is a static electrical equipment which transformer are electrical power

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Construction of a Mini off Grid Solar Home System

CHAPTER ONE INTRODUCTION The off-grid system term states the system not relating to the gird facility. Primarily, the system which is not connected to the main electrical grid is term as off-grid PV system . Off-grid system also called standalone system or mini grid which can generate the power and run the appliances by itself.

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Project write-up for final graduants

Project write-up on Construction of Keypad Access Control Lock With Card

The aim of constructing this system is to put in place a formidable locker security system with low cost and free of errors. Keywords – RFID Reader, Atmega328p, Keypad, LCD, Buzzer. The security system plays a significant role to keep out unknown users to access protected physical and logical places with no permission. Furthermore, unwanted people can hack the lock and have access to the protected place. It can further be use for smart cart can be interfaced with wireless technologies to make it completely portable in the nearest future.

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THE PROJECT REPORT, CONSTRUCTION AND DESIGN

PROJECT CONSTRUCTION OF AN AUTOMATIC CHANGE OVER SWITCH

A PROJECT REPORT SUBMITTED TO THE DEPARTMENT OF ELECTRICAL ENGINEERING IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF NATIONAL DIPLOMA IN ELECTRICAL ENGINEERING OF THE POLYTECHNIC, IBADAN. JULY, 2021. CERTIFICATION This is to certify that the project work, “CONSTRUCTION OF AN AUTOMATIC CHANGE OVER SWITCH” was done by; OJO EMMANUEL IBUKUNOLUWA 2018232040045OKE AYOMIDE

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EEC 125 | Define the following elements as related to a magnetic circuit

Magnetic flux is the surface integral of the normal components of the magnetic field B over that surface. It is usually denoted as ∅. The SI unit of magnetic flux is Weber∅ = BAcosø∅ = Magnetic fluxB = Magnetic fieldA = areaø = Angle between a perpendicular vector to the magnetic field and magnetic fluxMagnetic

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Project write-up for college, university and polytechnic students

COMPLETE SIWES REPORT – A TECHNICAL REPORT ON 4 MONTHS I.T TRAINING

The technical report contains a detailed explanation of the Student Industrial Work Experience Scheme(SIWES), the Transmission Company of Nigeria(TCN), Papalanto Works Centre, the variuos departments in the company including the departments I worked under my four months industrial training and the problem encountered during my Industrial placement.

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Differentiate between conduit and surface wiring

Differentiate between conduit and surface wiring by enumerating the tools and consumable materials used in each system No Conduit wiring Surface wiring 1 It is used to protect the cable inside the building or structure These are wire that are installed outside the building 2 In the case of PVC conduit, this wiring remains protected

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State two advantages and disadvantages of ELCB and wiring system

Define the following terms; State two advantages and disadvantages of ELCBMerits Merits of steel conduit wiring systems List two advantages and disadvantages of trunking wiring systemMerits List 10 hazard that can occur when working on electrical installation in building List two major hazards listed above and describe any two ways by which hazards may be

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Highlight five(5) differences between single phase and three phase supplies

Single phase supply Three phase supply In a single phase supply, it power is supplied through two wires. It is called neutral and phase(life) wire. In three phase power supply, the power is supplied through four wires, that is three phase and one neutral The voltage of one phase is 230v The voltage of three

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Briefly explain a cathode ray oscilloscope [6 marks

DEPARTMENT OF ELECTRICAL ENGINEERINGSECOND SEMESTER EXAMINATION 2016/2017 ACADEMY SESSION COURSE TITLE: ELECTRICAL AND ELECTRONIC INSTRUMENTATION 11COURSE CODE: EEC 216. CLASS:ND11TIME ALLOWED: 2 HOURS.INSTRUCTION: ANSWER QUESTION ONE AND ANY OTHER THREEQUESTION AND ANSWERQUESTION ONE CATHODE RAY OSCILLOSCOPE These are familiar piece of measuring equipment, as no Tv programme with a science content is complete without the

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Resistance of 40Ω, inductance of 0.4Hz and capacitance of 200µF are connected in series and are fed by 200v, 60Hz supply. Find;

CIRCUIT THEOREM EEC 222 A resistance of 40Ω, inductance of 0.4Hz and capacitance of 200µF are connected in series and are fed by 200v, 60Hz supply. Find; SOLUTION R = 40 Ω, L = O.4H, Capacitance = 200 × 10-6F, Frequency = 60Hz, Voltage = 200v. XL  = WL = 2ΠF × L   ;      2

Resistance of 40Ω, inductance of 0.4Hz and capacitance of 200µF are connected in series and are fed by 200v, 60Hz supply. Find; Read More »

3-phase induction motor is wound for 4 Poles and is supplied from a 50Hz system. Calculate;

Synchronous speed Rotor speed when slip is 4% Rotor frequency (5 marks) SOLUTIONI) Synchronous speed = f/p = 50/2 = 25rev/secII) Rotor slip 4% = Ns – Nr/ Ns × 100.4/100 = 25- Nr/25100 = 2500 – 100 Nr100Nr = 2400NrNr = 24rev/sec [RPM]III) Rotor frequency = [Ns-Nr]P= [25-24]2 = 2Hz

3-phase induction motor is wound for 4 Poles and is supplied from a 50Hz system. Calculate; Read More »

SOLVE PROBLEMS INVOLVING RESISTIVITY AND CONDUCTIVITY

resistors of resistance R₁, R₂ and R₃ are joint together, they’re said to be connected in series. It should be noted that;
The current through a series circuit is the same all over ( I.e I=i₁=i₂=i₃).
The voltage drop across each resistor is different depending on its resistances
The applied voltage (Vs) is equal to the sum of the Potential difference across each resistor. (i.e Vs = V(R₁) + V(R₂) + V(R₃) or V = V₁ + V₂ + V₃
Where Vs = IR; V₁ = IR₁; V₂ = IR₂; V₃ = IR₃
IR = IR₁ + IR₂ + IR₃
⇒(equivalent resistance), Req = R₁ + R₂ + R₃
For n resistors connected in series, the equivalent resistance
Req is given by Req

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Electrical terms you should know

ELECTRICAL TERMS, DEFINITIONS, INSTALLATION TOOLS, APPLICATION AND MAINTENANCE

Instruments used in the workshop should be properly insulated for the available voltage to prevent electric shock.
2. Workshop floor should be free from grease, oil and water to prevent electric workers from falling or stumbling and getting injured.
3. First aid must be available and equipped in the workshop.
4. Safety boots should be worn to prevent electrical hazard
5. The passage way to the workshop should be free from obstruction to allow free movement of workers.
6. Protective

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Prove that velocity of propagation in a concentric underground cable is equal to the speed of light

Absolute permittivity of a medium
μ = Absolute permeability of a medium
E = EoEr and μ =μoμr
Eo = Absolute permittivity of free space and Er = relative absolute permittivity
μo = Absolute permeability of free space and μr = relative absolute permeability
For magnetic material V = √(1/LC)
V = √[1/(μo/2π • inB/A × 2πEo

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Electrical Engineering machine(Labeler) questions and answers (krones PET lines)

Buffer system malfunction message means what?A) The label is cut offB) The Buffer system is too tensionC) The label is not properly fixed on the web guilderD) None of the aboveThe point at which the label is cut off from the buffer there will be buffer system malfunction on the HMI(human machine interface) When monitoring

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SUPPLY CHAIN ACADEMY RECOMMENDED ANSWERS FOR RGB CONVEYOR LINES including electrical/mechanical/mechatronics engineering science

Which of the factors listed below is not considered when selecting the types of conveyor chains and components to be used on conveyor system.A) The types of product to be handledB) Any specification of conveyor chains and components available for supply.C) Operating condition of the lineD) The specification of the conveyor chains and componentsThe types

SUPPLY CHAIN ACADEMY RECOMMENDED ANSWERS FOR RGB CONVEYOR LINES including electrical/mechanical/mechatronics engineering science Read More »

Differentiatiate between mutual inductance and coefficient of coupling

Mutual inductance: This is when the magnetic flux of two or more inductors are linked up together in that the voltage induced in one coil is proportional to the Chang of current in the another. Coefficient of coupling: This is the magnetic flux produce by current in one coil which links with the other coil.B)

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Determine the frequency of an oscillator given the inductance and capacitance, if the capacitor varied between 20pF-150pF | Electrical Engineering Questions

1. A frequency determining circuit in an L-C sinewave oscillator consist of a high Q inductance L = 200μH in parallel with a capacitor of C = 450pF. Determine the frequency range of the oscillator if this capacitor, can be varied between 20pF-150pF. SolutionInductance, L = 200μH= 200 × 10–⁶HCapacitance, C = 450pF= 450 ×

Determine the frequency of an oscillator given the inductance and capacitance, if the capacitor varied between 20pF-150pF | Electrical Engineering Questions Read More »

Electrical engineering science Question | How to calculate transformer greatest working voltage and efficiency of the spring.

A string of suspension insulator consist of 3-units, the capacitance between each link pins to earth is one-sixth of the self-capacitance of the unit. If the maximum peak voltage per unit is not to exceed 20kv. Find the greatest working voltage and efficiency of the spring. V = V1 + V2 + V3; = V1

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With the aid of a suitable diagram explain various types of oscillator

What is an Oscillator? The oscillator is a mechanical or electronic device and the working principle of the oscillator is, the periodic change between the two things depends on the changes in the energy. The oscillations are used in radios, watches, metal detectors, and in many other devices. The oscillator converts the DC (direct current) from the power

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How to find resistance, reactance and impedance of a transformer

How to find the equivalent resistance, reactance and impedance referred to primary and secondary side of a transformer | Electrical science

A 500/200v single phase transformer has primary resistance of 0.5Ω and reactance of 3.7Ω, while the secondary resistance and reactance are 0.03Ω and 0.25Ω respectively. Compute the equivalent values of resistance, reactance and impedance referred to;I. the primaryII. the secondary Equivalent resistance (Values of resistance)R1(primary resistance) = 0.5Ω, R2 (secondary resistance) = 0.03Ωand X1( primary

How to find the equivalent resistance, reactance and impedance referred to primary and secondary side of a transformer | Electrical science Read More »

A Electrical machine has an efficiency of 80%, if the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio. Neco 2003

MACHINE (WORK 1) (A) M.A = F.R, M.A = load/effort or output force/input forceWhere F.R = force ratio(B) Velocity ratio = distance moved by effort/ distance moved by load = e/L(C) Efficiency = M.A/V.R × 100%OrEfficiency = work output/work input × 100%EXAMPLE 1A machine has an efficiency of 80%, if the machine is required to

A Electrical machine has an efficiency of 80%, if the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio. Neco 2003 Read More »

EEC 222 ELECTRICAL POWER III

EEC 222 ELECTRICAL POWER III | PAST QUESTION AND ANSWER ND2

Course title: electrical power IIICourse code: EEC 222Class: ND2 full timeInstruction: Answer question one and any other threeTime allowed: 2 hours QUESTION ONE (1) a) state three (3) advantages and three (3) disadvantages of interconnected power system. (3 marks)ADVANTAGES Increase reliability of supply Ensures economical operation Exchange of peak load DISADVANTAGES It requires more investment

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Steam power plant

Explain the working principle of a steam or gas turbine power plant in Electrical science

With the aid of a block diagram explain the working principle of a gas turbine power plant A gas turbine power plant iss the type of generating station that uses gas turbine as the prime over for the generation of electrical energy. The air combustion chamber where heat is added to air, thus raising its

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What are the hazards and safety behaviors one must observe when operating Electrical machine

WHAT ARE THE SIX CAUSES OF ACCIDENT ON LINE ONE(1) TO LINE EIGHTEEN (18) Poor house keeping: not properly arranging the line after production, speels all over the plants, e.t.c can cause accident on the plants. Falling hazard: Falling hazard include stuffs like a falling ladder, falling gadgets, falling gas cylinder or any other equipment

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ELECTRICAL INSTALLATION OF BUILDING (EEC 129)

What is electrical installation: it is an electrical wiring of cabling or fixing electrical equipment and other accessories such as sockets, switches, chandelier, distribution board, lamp holder e.t.c on a building, office, company e.t.c Types of electrical installation 3 SINGLE PHASE TRANSFORMER CONNECTED INTO A STAR DELTA 3∅ GROUP They are joined by means of

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Electrical machine test

Short notes on voltage regulation, short and open circuit, transformer efficiency | EEC 213 Electrical machine

SHORT CIRCUIT TEST: The secondary is short-circuited through a suitable ammeter, A2, While a lot voltage is applied to the primary and adjusted to circulate full-load current in the primary and secondary circuit iron losses is negligible and wattmeter reading is that of copper losses in the windings [ iron loss a (flux)² applied voltage which is small about 1/30 of V1]
Constant Losses: The iron loss due to hysteresis and Eddy currents are constant at all loads because Flux variation between no load and full load is 2%-5%
Variable Losses: The copper loss depends on the load since variation of load from no load to full load is 100%.

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Block Diagram and functions of regulated Electrical power supply

REGULATED POWER SUPPLY it is the terminal voltage that will remains almost constant regardless of the amount of current drawn from it. Using zener diode and transistor are used for voltage regulation purposes. It’s impossible to get 100% constant voltage but minor variations are acceptable for most of the jobs

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Project write-up for final graduants

Electrical Engineering Science Project Write-up on Inverter

CHAPTER ONE INTRODUCTION1.1 BACKGROUND OF STUDYElectricity could be said to be one of the greatest inventions of man. This is because many other inventions and processes depend on it for proper functioning. The most common source of this important energy is the utility lines that come from hydroelectric power stations. However, the AC supply from

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How to find voltage V1 and V2 using kvl | Electrical circuit theorem I

Find the voltage V1 and V2 using kvl To Find V1 and V2, we’ll have to use ohm’s law and Kirchoff voltage law. Assume that current (I) flows through the loop from ohm’s law, v = IR so therefore, V1 = 4I,. V2 = -2I Applying kvl around the loop given -10 + V1 -8

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Derive an expression for Electrical power in a pure a.c resistive circuit.

CIRCUIT THEOREM 1. With a suitable diagram show the alternating current and voltage in a pure resistance are to phase. Hence, derive an expression for power in a pure a.c resistive circuit. R = resistanceFrom ohm’s law,V = IRVmSinwt = IRI =(VmsinWt) ÷ RRecall SinWt = 1Current(I) is maximum(IM)IM = Vm/RTherefore,Instantaneous current (I) = IMSinWtPower

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ELASTIC LIMIT AND HOOKE’S LAW | Electrical Engineering topic

ELASTIC PROPERTIES OF SOLIDS Young ModulusYoung Modulus, y is defined as the ratio of tensile stress to tensile strain.Y = tensile stress/tensile strainTensile strain is the ratio of the extension of a material to the cross sectional area of the material.Strain = change in extension/ original length = e/LTensile strain has no unitTensile stress is

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Friction

JAMB QUESTION AND ANSWER ON FRICTION

To obtain the coefficient of static friction, µ, the angle of inclination of the plane, , is slowly increased until the block just begins to slide down the plane. At this point, the parallel component of the weight, W sin acting downwards along the plane is equal to the limiting frictional force, F = µR acting upwards along the plane.
That is, F = Wsin ………………………………………….(1)
Or µR = Wsin
Also, on an inclined plane, the normal reaction R is not equal to the weight, W, but to the perpendicular component of the weight, Wcos
That is R = Wcos ……………………………………………(2)
Combining equation (1) and (2),

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Project write-up for college, university and polytechnic students

ENGINEERING SCIENCE PROJECT ON FABRICATION AND INSTALLATION OF WORKSHOP METAL DOOR 2022

ABSTRACT
This project is based on fabrication of metal door. A metal door is a movable structure used to close off an entrance typically consisting of a panel that swings, slide or rotate.
This metal door more reliable and strong and has much good working appearance than other doors like, wooden door, glass door, leather door and so on. Various fabrication processes such as marking out, cutting, bending, joining or welding, grinding, spraying and so on were adopted and implemented in the fabrication of this twin leaf metal door, peep hole was fixed on the door to screw visitor and admit on choice, the main purpose is to ensure safety and protection.
The material used to make this project to be a well strong design are as follows: galvanized metal plate, square pipe, lockset key, paint, hinges guage, 2electrode and grinding disk and the major reason of using the material is to provide good making features of the door which will meet up with now adays demand and designs, and in order to expose students on how to use different types of simple tools and some machines. The special features on the door are as follows, pinhole, lockset key, hinges small, square pipes, paint which is use to coat the door against rusting.

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Write the time equation for the voltage and the resulting current.

A 60Hz voltage of 280v effective value is impressed on an inductance of 0.356H. SolutionF = 60Hz, V = 280v, L= 0.356H Time equation for the resulting voltageV = VoSin2πftThe root mean square voltage, VV = `Vo/2Vo = V × 2280 × 1.4142 = 395.98V RESULTING VOLTAGE,V = VoSin2πftV = 395.8Sin2 ×3.142 × 60 ×tV

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An Electrical amplifier when first built has an open loop gain of 120 after a while due to ageing this falls to 90. Calculate the percentage reduction in gain.

An Electrical amplifier when first built has an open loop gain of 120 after a while due to ageingthis falls to 90. Calculate the percentage reduction in gain.Av (original) = 120, Av (aged) = 90% reduction = Original gain – New gain x 100%Original gain= 120 – 90 x 100120= 25%So the gain has fallen

An Electrical amplifier when first built has an open loop gain of 120 after a while due to ageing this falls to 90. Calculate the percentage reduction in gain. Read More »

Electrical Engineering Jamb Questions on vector and scalar quantities

(1) Answer True or False to the following questions QUESTIONS a. Both a spring balance and a chemical balance are used to measure the mass of an object. Answer False the spring balance is used to measure weight while the chemical balance is used to measure mass of an object. b. Hooke’s law form the

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Solar panel | Things you need to know before installing

Solar panel BASIC PART THAT ARE REQUIRED FOR INSTALLATION 1.Solar panel Solar panels are those devices which are used to absorb the sun’s rays and convert them into electricity or heat. Description: A solar panel is actually a collection of solar (or photovoltaic) cells, which can be used to generate electricity through photovoltaic effect. 2.

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Engineering Siwes report on computer engineering – free write-up

STUDENT INDUSTRIAL WORK EXPERIENCE SCHEMEFROMOCTOBER 2020 TO FEBRUARY 2021 BYADEEYO ISLAMIYAT ADEJUMOKEMATRIC NO: 2015070501021TECHNICAL REPORTONSTUDENT INDUSTRIAL WORK EXPERIENCE SCHEME (SIWES)HELD ATCROWN HOPE COMPUTER SCHOOLAKINLOLU SHOP 2 CHIEF ADEJUMO COMPLEX APATA IBADAN SUBMITTED TO:THE DEPARTMENT OF COMPUTER STUDIESFACULTY OF SCIENCETHE POLYTECHNIC IBADAN FEBUARY, 2022 CHAPTER ONE 1.0 IntroductionStudent Industrial Work Experience Scheme (SIWES) was established by

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AN ENGINEERING SCIENCE TECHNICAL REPORT (SIWES) FOR MECHANICAL ENGINEERING DEPARTMENT

INTRODUCTION TO SIWES PROGRAM
SIWES which stands for Student Industrial Working Scheme was established by ITF in 1973 to solve the problem of lack of adequate practical skills preparatory for employment in industries by Nigeria graduates of tertiary institution.
The Scheme exposes students to industry based skills necessary for a smooth transition from classroom to the world of work. It affords the students of tertiary institution the opportunity of being familiarized and exposed to the needed experience in handling machinery and equipment which are not usually in

AN ENGINEERING SCIENCE TECHNICAL REPORT (SIWES) FOR MECHANICAL ENGINEERING DEPARTMENT Read More »

HOW TO WRITE AN ELECTRICAL TECHNICAL REPORT ON STUDENT INDUSTRIAL WORK EXPERIENCE SCHEME (SIWES)

The student industrial work experience scheme (SIWES) is an essential programme that all students offering the following courses: Engineering, Mass Communication, Computer Science, Civil Engineering, Math and Statistics, Office Technology and Management and other science-related courses are engaged to participate. How does a good siwes report should look like? For example we’ll be looking at

HOW TO WRITE AN ELECTRICAL TECHNICAL REPORT ON STUDENT INDUSTRIAL WORK EXPERIENCE SCHEME (SIWES) Read More »

Solution to Problems on JFET and single stage transistor amplifier(EEC 224)

JFET and transistor amplifier questions on electronics III (EEC224) In a transistor amplifier, when the signal changes by 0.02v, the base current changes by 10μA and the collector by 1mA. If collector resistance Rc = 5KΩ and RL 10KΩ. Find (I) current gain (II) A.C load (III) voltage gain (IV) power gain (I) current gain

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What is a thermistor in electrical maintenance and repair

What’s a thermistor? Is a type of resistor whose resistance is reliant on temperature. They’re made from metallic oxide which is molded into a bead, disk or cylindrical shape and then enclosed with epoxy or glass.Thermistor have come into popular usage in electric circuit of heating and cooling systems, the name was derived from the

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Uses and application of oscilloscope in instrumentation

USES OF CATHODE RAY OSCILLOSCOPE(I) A.C VOLTAGEIt’s used to determine an unknown a.c voltage(II) MEASUREMENT OF FREQUENCY.It’s useful in determining the frequency of the waveform. A calibrated time-base is used to measure frequency.(III) MEASUREMENT OF PHASEIt’s used to know the angular difference of two waveforms. This is done by connecting a double beam oscilloscope to

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Explain how to use an analogue multimeter to test Diode, PNP, NPN transistor, polarised and non-polarized capacitor

Explain how to use an analogue multimeter(1) To test non-polarized capacitors.(2) To test NPN transistor.(3) to test Diode(4) To test PNP transistor(5) To test a polarised capacitor (1) To test non-polarized capacitors: You can know when the resistance of the capacitor is less than about 1MΩ, and allows d.c to pass From the battery in

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MENTION THREE (3) CHANGES THAT TAKES PLACE DURING CHARGING OF BATTERY.

LIST FOUR (4) ADVANTAGES OF A TRANSFORMER. (4 MARKS) 1. It’s one of the economical devices to transmit electrical power at high voltage and current. Can also be reduced at the designed voltages when required. 2. Its efficiency is very high in comparison to other electrical machine.3. It can be operated very easily with little

MENTION THREE (3) CHANGES THAT TAKES PLACE DURING CHARGING OF BATTERY. Read More »

A 440:110 ratio single-phase transformer draws 5Amps on no load at 0.9 power factor, calculate the value of; I) magnetizing current. (Ii) core component of current

Solution V1 = 440v, V2= 110V, no load current = 5A, p.f = 0.9Cos theta = 0.9, theta = cos^-1 [0.9], theta = 25.84° I) magnetizing current = no load current × sin theta= 5×sin 25.84= 5 × 0.44magnetizing current, Im = 2.2A II) core current = load current × cos theta= 5×0.9Ic = 4.5AIron

A 440:110 ratio single-phase transformer draws 5Amps on no load at 0.9 power factor, calculate the value of; I) magnetizing current. (Ii) core component of current Read More »

EXPLAIN THREE PRINCIPLES OF ELECTROMAGNETIC MACHINES in transformer

The three principles of electromagnetic machines are; → induction → interaction → Alignment Principle of Induction in electrical machine PRINCIPLE OF INDUCTION: Is the essential production of an e.m.f by magnetic means via an interlinked electrical and magnetic circuits. A summation of all the products of flux and turns [∅N] gives the total flux linkage

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ENUMERATE 5 (FIVE) MAINTENANCE PROCESSES OF ELECTRIC KETTLE

ENUMERATE 5 (FIVE) MAINTENANCE PROCESSES OF ELECTRIC KETTLE (5 marks) 1. Never connect empty kettle to mains supply. Put enough water. 2. At the time of repairing, disconnect it from main supply. 3. When using water must not enter because short circuit, earth or leakage fault may occur. 4. Avoid using broken cord or naked

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ENUMERATE 5 (FIVE) MAINTENANCE PROCESSES OF ELECTRIC KETTLE AND THREE [3] PRECAUTION TO BE TAKEN WHEN REPLACING CAPACITOR IN A CIRCUIT.

This blog entails THREE [3] PRECAUTION TO BE TAKEN WHEN REPLACING CAPACITOR IN A CIRCUIT AND 5 (FIVE) MAINTENANCE PROCESSES OF ELECTRIC KETTLE (5 marks)

ENUMERATE 5 (FIVE) MAINTENANCE PROCESSES OF ELECTRIC KETTLE AND THREE [3] PRECAUTION TO BE TAKEN WHEN REPLACING CAPACITOR IN A CIRCUIT. Read More »

A coil consists of 2000 turns of copper wire having a cross-sectional area of 0.8mm square. The mean length per turns is 80cm and the resistivity of copper is 0.02micro meter. Find the resistance of the coil and power absorbed by the coil when connected across 110v d.c supply.

A coil consists of 2,000 turns of copper wire having a cross-sectional area of 0.8 mm2. The mean length per turn is 80 cm, and the resistivity of copper is 0.02 µ Ω-m. Find the resistance of the coil. Solution: Length of the coil, L= Number of turns × mean length per turn = 2,000

A coil consists of 2000 turns of copper wire having a cross-sectional area of 0.8mm square. The mean length per turns is 80cm and the resistivity of copper is 0.02micro meter. Find the resistance of the coil and power absorbed by the coil when connected across 110v d.c supply. Read More »

ELECTRICAL PROJECT PROPOSAL ON FABRICATION OF COMBINED AUTOMATED HAND-WASHING DEVICE (WASHING, RINSING AND DRYING)

A PROJECT PROPOSAL SUBMITTED TO THE DEPARTMENT OFMECHANICAL ENGINEERING,IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF NATIONAL DIPLOMA (ND) IN THE DEPARTMENT OFMECHANICAL ENGINEERING TECHNOLOGY. FEBRUARY,2021. CERTIFICATION This is to certify that this project proposal titled FABRICATION OF COMBINED AUTOMATED HAND-WASHING DEVICEis carried out by: ————————————- ————————–ENGR.OKUNLOLA G.S DATE( SUPERVISOR) ———————————— ————————-MR.ADETOLA .W

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Past question and answer on tellecomunication II (EEC 218)

COURSE TITLE: TELECOMMUNICATION II What is propagation of radio wave? ANSWERRADIO IS the behaviour of radio waves when they are transmitted or propagated from one point on the earth to other parts of the atmosphere. Explain the following terms in connection with radio wave propagation. List (8) eight radio frequency and their uses. VERY LOW

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Principle of operation of a JFET

FIELD EFFECT TRANSISTOR There are basically two types of transistors Bipolar junction transistor (BJT) :- a current controlled device in which output characteristics are controlled by base current Field effect transistor (FET) :- output characteristics controlled by input voltage i.e. electric field Types of FET Junction Field Effect Transistor (JFET) Metal oxide semiconductor Field Effect

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