Notes, summaries, assignments, exams, and problems for Electronics

High

1.      What is the purpose of the HL-suppress buttom?

To switch off the HL temporarily

2.      What is the purpose of the drift control?

Used to ground stabilise true motion display

3.      What is the purpose of the brilliance control?

Adjust signal intensity on the display

4.      How to reduce beam width distortion?

Reduce gain

5.      Which course should be fed in to a stabilised radar picture?

True course

6.      What is the purpose of the VRM control?

To measure distance accurately

7.      Marine radar bearing accuracy is generally?

Not so good

8.      It is a requirement to have The HM-suppress button spring loaded?

Yes, it is an IMO requirement

9.      What is the minimum display diameter required

1.      18 Is it a requirement for the ARPA to provide warning on connected external equipment?

Yes

2.      Is it a requirement for an ARPA to be sea and ground stabilised?

Yes

3.      Comparing manual and automatic acquisition, which is most sensitive?

Manual acquisition

4.      What is the difference between a tracking gate and a tracking window?

It is the same thing

5.      What is the purpose of digitizing the radar echoes?

The ARPA tracking system only work with digital signals

6.      What is the purpose of the steady course filter?

Provide stabile target information

7.      Can a target reduction of speed activate the fast filter?

Yes

8.      Can a target course change deactivate the slow filter?

Yes

9.     

36.      Does current and drift effect the True vector on a relative motion display?

Yes

2.      If you input gyro course to the ARPA, what can you expect?

Error in other ships calculated course

3.      Why is raster scan display “lock up” so dangerous?

The displayed information is no longer relevant

4.      What is dangerous with operating the ARPA in mixed mode over time?

Forgetting that this actually in mixed mode

5.      What can you expect from the ARPA target tracking system in auto acquisition mode?

Small and weak targets may not be acquired

6.      Doesthe line connecting the PAD or POS whit the target indicate target speed?

No

7.      What is the meaning of a flashing triangle, apex pointing down?

New target

Reduce Energy Consumption

There are many ways to reduce energy consumption in our daily lives:

• Turn off lights and electronic devices when not in use.
• Use LED light bulbs instead of traditional ones.
• Unplug chargers and appliances when not needed.
• Use public transport, bike, or walk instead of driving.
• Insulate homes properly to reduce heating/cooling needs.
• Use renewable energy sources like solar panels.

Small actions can make a big difference.

Reduce Water Consumption

Water is a vital resource, so it is important to reduce its use whenever possible:

• Take shorter showers and turn off the tap while brushing teeth.
• Fix leaks in pipes and toilets.
• Use dishwashers or washing machines only when full.
• Water plants early morning or late evening.
• Collect rainwater

The Relationship Between Culture and Education

The relationship between culture and education is fundamental to ensuring that all students can learn in a fair and meaningful way. However, when teachers focus solely on complying with standard educational regulations, without taking into account the cultural and linguistic needs of students, there could be problems that affect both their learning and their integration into the classroom.

The Limitations of Standardized Education

On the one hand, general educational standards attempt to ensure that all students achieve the same goals, which seems positive, as it promotes equality and allows progress to be measured in a uniform way. However, this approach does not take into account that students come... Continue reading "Culture and Education: Impact on Student Learning" »

Technology in Education: A Balanced Perspective

The integration of technology is revolutionizing education, teaching, and the classroom environment. Therefore, we must keep in mind both the positive and negative aspects of technology in education.

The Positive Impact of Technology

Technology has transformed education through online platforms, making it more accessible, dynamic, and personalized. This can significantly impact students' educational success.

The Drawbacks of Technology in the Classroom

We must remember the drawbacks of technology in the classroom. If not used properly, it can negatively impact studies, life outside school, and even personality. It's important to schedule screen time to avoid excessive use.

Conclusion: Balance is Key

The... Continue reading "Tech in Education: Balancing Innovation and Well-being" »

Task States: Suspended, Pended, Delayed

Suspended Task: A task is suspended when it is explicitly put into an inactive state by the operating system or another task. It does not participate in scheduling until it is resumed.

Pended Task: A task is pended when it is waiting for an event (e.g., a semaphore or message queue) to continue execution.

Delayed Task: A task is delayed when it is programmed to pause execution for a defined time (e.g., using a timer).

Exceptions and Their Classification

Exception: An event that disrupts the normal execution of a processor and forces it to execute special instructions.

Types of Exceptions

Synchronous Exceptions

Caused by internal processor events like division by zero or memory access errors.

Asynchronous Exceptions

Triggered... Continue reading "RTOS Concepts: Tasks, Exceptions, Semaphores, IPC" »

SCR Construction

A thyristor, or SCR, consists of four P-N-P-N layers and has three PN junctions (J1, J2, J3) in series. It has three terminals: Anode, Cathode, and Gate. The Gate terminal is attached to the P-type layer near the Cathode terminal. The two-transistor model shows that an SCR is a combination of one PNP transistor and one NPN transistor.

The emitter of the PNP transistor is taken as the Anode terminal, the emitter of the NPN transistor is taken as the Cathode, and the base of the PNP is taken as the Gate terminal. The base of the PNP is connected to the collector of the NPN, and the collector of the PNP is connected to the base of the NPN transistor.

Advantages of SCRs:

• Easy to turn ON
• Can handle large voltage, current, and power
• Possible

1. Task Constraints in Real-Time Systems

In real-time systems, task constraints refer to the limitations or requirements that must be met for timely and correct execution. The key constraints include:

• Time constraints (hard and soft deadlines)
• Precedence constraints (task dependencies)
• Resource constraints (limited CPU, memory)
• Synchronization constraints (shared resource management)

Failing to meet these constraints can result in system failure in critical applications like aircraft control and medical monitoring systems.

2. EDD (Earliest Due Date) Algorithm Explained

The EDD (Earliest Due Date) algorithm is used for aperiodic task scheduling, where tasks are executed in order of their deadlines. The task having the earliest due date is given the

Unit 12

Visitor: Hello there. I’m thinking of buying a USB flash drive and I’ve heard you’re presenting a new device at this show. Could I see it?

Salesperson: Of course. This is the new Dragon flash drive, a compact flash memory drive that acts like a portable hard drive.

Visitor: And what’s the storage capacity?

Salesperson: Well, this model here can hold 16 gigabytes of data. We also have drives of 64 gigs, but they’re more expensive. The drive consists of a USB connector covered by a removable cap, a mass storage controller, and a flash memory chip. It also includes a write-protect switch and password protection.

Visitor: You’re getting a bit too technical for me! Does it connect like a normal drive?

Salesperson: Yes, you just plug... Continue reading "Dragon Flash Drive and MP4 Player: Features and Comparison" »