Derudite Academy

🚀 Exciting News! Introducing P-QUES by Derudite Academy 📝✨ Your go-to source for UNIUYO Faculty of Engineering past questions and solutions. 🎓🔍 Stay tuned for updates!

🎉 Happy New Year from Derudite Academy! 🌟 Wishing you a year filled with academic triumphs and learning adventures! 🚀📚

Wishing you a reflective and joyful last day of 2023! 🎉

Here's to a new year filled with endless possibilities! 🌟

I am classified as a metal but I am liquid at room temperature.

What am I?

📚✨ Make us your assignment plug and stop worrying about endless assignments. Whether online or offline, our seasoned team is ready to assist you in conquering assignments with excellence. 🚀🌐
,

4

9: Finding Eigenvalues and Eigenvectors of a 2×2 Matrix. ✍️

Sketch 5: Our students are getting better at technical drawing. Join our academy to become erudite in your studies!

8: Still supporting students. Another homework solved! Send in your assignments now and get expert solutions!

Sketch 4: Another Beautiful sketch on orthographic and Isometric Projections from one of our students.

Big shout out to our newest top fans! 💎

Awajiogak Waribo, Lewis Euler, Andrew Richie, Moses Udofia

Exercise 7: Another Assignment Conquered!
We are still taking orders. Bring on your toughest assignments and let's ace them for you!

DYK 4: Absolutely Incredible!!!😳 Can you believe this?

Quiz 3: What is the process by which plants convert sunlight into food?

Quiz 2: What is the synonym of "REMOTE"

2: Let's see who got the IQ😏 Try this!

Quiz 1: Tick-Tock Challenge - Test Your Knowledge of Time and Chronology!

Exercise 6: Homework Solved! 🎉 Check out our solution for obtaining the Fourier Series of f(x) = e^(-x) in the interval 0≤x≤2π. 📝✨ "

Good morning 🌄

Here's a little breakfast 😁

1

Physics Lesson 2: What is Impulse?
_____________________________________________________________
Welcome back to our tutorial series! In our last lesson, we learned about momentum and how it relates to moving objects. Today, we're going to dive into another important concept called "impulse."

Impulse is closely related to momentum, but it focuses on the changes in momentum rather than the actual quantity of momentum itself. So let's get started and understand what impulse is all about!

Imagine you're playing soccer, and you want to kick the ball with all your might. You give it a strong, powerful kick, and the ball goes flying. What you just did was applying an impulse to the ball.

In simple terms, impulse is the force applied to an object over a certain period of time. It's like a quick push or a sudden change in momentum. So, when you kicked the ball, the force you applied to it created an impulse that changed its momentum.

Now, let's break down the concept of impulse using a simple formula:

Impulse = Force × Time

The impulse exerted on an object is directly proportional to the force applied and the time it acts upon the object. The greater the force or the longer the time, the larger the impulse.

To better understand this, let's consider an example. Imagine you have two identical balls, and you apply the same force to both of them. However, for the first ball, you apply the force for a shorter duration, let's say one second. For the second ball, you apply the force for a longer duration, let's say three seconds.

Since impulse depends on both the force and the time, the impulse applied to the second ball will be three times greater than the impulse applied to the first ball. This means the second ball will experience a greater change in momentum.

So, the key takeaway here is that impulse is not only determined by the force applied but also by the time over which the force is applied. The longer the force acts upon an object, the greater the impulse and the greater the change in momentum.

Now that you have a basic understanding of impulse, let's recap what we've learned:

1. Impulse is the force applied to an object over a certain period of time.
2. Impulse is related to changes in momentum.
3. The formula for impulse is Impulse = Force × Time.
4. The greater the force or the longer the time, the larger the impulse.

That's it for our simplified lesson on impulse! Keep up the great work, and happy learning!

🔔 Like our page Derudite Academy for expert homework help and more tutorial Lessons.

Keypoint 8: What is a Semiconductor?

Happy Father's Day to the remarkable dads of Derudite Academy! Your dedication to both your children and their education is truly inspiring. Wishing you a day filled with love, appreciation, and well-deserved recognition. Thank you for being outstanding fathers and role models!

Keypoint 7: 11 Drawing Instruments And Their Uses.............................................................
1. Compass: used for drawing circles and arcs, and for measuring distances.

2. Straightedge: flat bar with a straight edge, used for drawing straight lines and as a guide for cutting.

3. Protractor: used for measuring and drawing angles.
4. French curve: shaped template made of plastic or metal, used for drawing curves.

5. T-square: large T-shaped ruler used for drawing horizontal lines. Can be used with a drafting table or drawing board.

6. Set square: triangular ruler used for drawing right angles and perpendicular lines. Can be used with a T-square or on its own.

7. Scale: used for drawing accurate representations of objects to a specific size.

8. Triangle: ruler with three straight edges of different lengths, used for drawing angles and checking the accuracy of right angles.

9. Pencil sharpener: used for sharpening pencils to a fine point, allowing for precise lines to be drawn.

10. Eraser: used for correcting mistakes and removing pencil marks from a drawing. Can be a gum eraser or a plastic eraser.

11. Drawing board: flat surface used for drawing, usually mounted on a stand or easel. Can be adjusted to different angles

Keypoint 6: 24 Revision Questions on DC Motor Drives and Generators!

Q1: What is the speed regulation of a DC motor?
A1: Speed regulation refers to the ability of a DC motor to maintain a relatively constant speed under different load conditions.

Q2: How can the speed of a shunt DC motor be controlled? Explain in detail.
A2: The speed of a shunt DC motor can be controlled by adjusting the field current or armature voltage. A decrease in field current or increase in armature voltage will increase the speed of the motor, while an increase in field current or decrease in armature voltage will decrease the speed.

Q3: What is the practical difference between a separately excited and a shunt DC motor?
A3: A separately excited DC motor has a separate power source for the field winding, while a shunt DC motor has the field winding connected in parallel with the armature. This results in different speed-torque characteristics and methods of speed control.

Q4: What effect does armature reaction have on the torque-speed characteristic of a shunt DC motor? Can the effects of armature reaction be serious? What can be done to remedy this problem?
A4: Armature reaction can cause a decrease in the motor's torque and a distortion of the torque-speed characteristic. This effect can be serious, especially at high loads. Compensation can be done by providing a small amount of additional field current in the opposite direction of the armature current.

Q5: What are the desirable characteristics of the permanent magnets in PMDC machines?
A5: The desirable characteristics of permanent magnets in PMDC machines include high remanence, high coercivity, high energy product, and low temperature coefficient.

Q6: What are the principal characteristics of a series DC motor? What are its uses?
A6: The principal characteristics of a series DC motor are high starting torque and variable speed. It is used in applications such as traction, hoists, and cranes.

Q7: What are the characteristics of a cumulatively compounded DC motor?
A7: A cumulatively compounded DC motor has a field winding that is wound in the same direction as the armature winding, resulting in an increase in the motor's torque as the load increases.

Q8: What are the problems associated with a differentially compounded DC motor?
A8: A differentially compounded DC motor can have a fast voltage drop with increasing load, leading to unstable performance and potential damage to the motor.

Q9: What happens in a shunt DC motor if its field circuit opens while it is running?
A9: If the field circuit of a shunt DC motor opens while it is running, the motor's speed will increase uncontrollably and could be damaged.

Q10: Why is a starting resistor used in DC motor circuits?
A10: A starting resistor is used in DC motor circuits to limit the starting current and prevent damage to the motor.

Q11: How can a DC starting resistor be cut out of a motor's armature circuit at just the right time during starting?
A11: A centrifugal switch or a time-delay relay can be used to cut out a DC starting resistor from a motor's armature circuit at the right time during starting.

Q12: What is the Ward-Leonard motor control system? What are its advantages and disadvantages?
A12: The Ward-Leonard motor control system is a method of speed control that uses a DC generator and motor connected by a variable voltage source. Its advantages include smooth speed control and the ability to reverse the motor's direction, but it is complex and requires additional equipment.

Q13: What is regeneration?
A13: Regeneration refers to the process by which a motor acts as a generator and returns energy to the power supply.

Q14: What are the advantages and disadvantages of solid-state motor drives compared to the Ward-Leonard system?

A14: Solid-state motor drives have advantages such as higher efficiency, smaller size, and lower maintenance compared to the Ward-Leonard system. However, they can be more expensive and may require more complex control circuits.

Q15: What is the purpose of a field loss relay?

A15: The purpose of a field loss relay is to protect a DC motor from damage by opening the circuit if the field current drops below a certain level.

Q16: What types of protective features are included in typical solid-state dc motor drives? How do they work?

A16: Typical protective features in solid-state DC motor drives include overcurrent protection, overvoltage protection, undervoltage protection, and thermal protection. These features work by monitoring various parameters of the motor and shutting down the system or reducing the load if any of these parameters exceed safe levels.

Q17: How can the direction of rotation of a separately excited DC motor be reversed?

A17: The direction of rotation of a separately excited DC motor can be reversed by reversing either the field or the armature connections.

Q18: How can the direction of rotation of a shunt DC motor be reversed?

A18: The direction of rotation of a shunt DC motor can be reversed by reversing either the field or the armature connections.

Q19: How can the direction of rotation of a series DC motor be reversed?

A19: The direction of rotation of a series DC motor can be reversed by reversing the connections of either the armature or the field. However, this must be done carefully as reversing the field connections can cause a short circuit.

Q20: Name and describe the features of the five types of generators covered in this chapter.

A20: The five types of generators covered in this chapter are shunt-wound generators, separately excited generators, series-wound generators, compound-wound generators, and permanent magnet generators. Each type has different features and characteristics. For example, shunt-wound generators have a constant terminal voltage and are suitable for applications that require stable voltage, while compound-wound generators have a better voltage regulation but are more complex and expensive.

Q21: How does the voltage buildup occur in a shunt DC generator during starting?

A21: The voltage buildup in a shunt DC generator during starting occurs as the field current is gradually increased to produce a magnetic field, which induces a voltage in the armature winding. The voltage gradually increases until it reaches the desired level.

Q22: What could cause voltage buildup on starting to fail to occur? How can this problem be remedied?

A22: Voltage buildup during starting may fail to occur due to a weak field, high armature resistance, or low armature reaction. This problem can be remedied by increasing the field current, reducing the armature resistance, or adjusting the brushes to reduce armature reaction.

Q23: How does armature reaction affect the output voltage in a separately excited DC generator?

A23: Armature reaction in a separately excited DC generator causes a distortion in the magnetic field, which can reduce the output voltage. The effect of armature reaction can be minimized by using a compensating winding or adjusting the position of the brushes.

Q24: What causes the extraordinarily fast voltage drop with increasing load in a differentially compounded DC generator?

A24: The fast voltage drop with increasing load in a differentially compounded DC generator is caused by the interaction of the series and shunt field windings. As the load increases, the series winding produces a stronger field, which reduces the output voltage.

• Follow Derudite Academy for more quizzes, tutorials and homework help.

Physics Lesson 1: What is Momentum? ....................................................................
Today, we're going to be discussing one of the most fundamental concepts in physics - momentum.

So what is momentum? Well, momentum is a measure of an object's motion. It takes into account both the object's mass and its velocity. The formula for momentum is p equals m times v, where p is momentum, m is mass, and v is velocity.

Let's say we have two objects - one with a mass of 10 kilograms and a velocity of 5 meters per second, and the other with a mass of 5 kilograms and a velocity of 10 meters per second. Which one has more momentum?

That's right, the second object has more momentum. Why? Because its velocity is higher, even though its mass is lower. Remember, momentum takes both factors into account, so it's not just about the mass of the object.

Conservation of Momentum:
Now, let's talk about the conservation of momentum. This principle states that the total momentum of a system remains constant unless acted upon by an external force. This means that in a closed system, the total momentum before a collision or interaction is equal to the total momentum after the collision or interaction.

For example, let's say we have two objects colliding - a car and a wall. Before the collision, the car has a certain amount of momentum based on its mass and velocity. After the collision, the car comes to a stop, but the momentum of the system is still conserved - it's just been transferred to the wall.

Applications of Momentum:
Finally, let's look at some real-world applications of momentum. Momentum is an important concept in sports, particularly in collisions like tackles and collisions between objects. It's also used in engineering and transportation, where understanding the momentum of objects in motion is crucial for designing and building safe and efficient systems.

So there you have it - a brief tutorial on momentum. Remember, momentum is a measure of an object's motion, and it's calculated by multiplying mass by velocity. And don't forget the conservation of momentum - in a closed system, the total momentum remains constant. Thanks for joining me today, and happy learning!

🔔Like and follow Derudite Academy for homework help and more tutorials!

Sketch 2: An orthographic drawing of a flash drive, perfect for your technical tutorials.✏️📏

GRE 311 Course Outlines for 300 level students, University of Uyo.

IMPORTANT NOTICE

We have changed our page name from "Maths Prep" to "Derudite Tutorials".

As included in our profile, "Maths Prep" is a fraction of "Derudite Tutorials"

Derudite Tutorials is an educational platform set up with the prior aim "nurturing educational legends" we however focus only on 2 main courses (Mathematics and Physics) for now and our services include:

1. Offline classes
2. Online classes via social platforms
2. Video Tutorials on facebook, youtube and Instagram
3. Provision of answers to past questions
7. Prep classes for WAEC, NECO,NABTEB, GCE, JAMB, SAT, PUTME etc.

We remain your one true "Derudite Tutorials"