Notes, abstracts, papers, exams and problems of Electronics

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Radar

Classified in Electronics

Written at on English with a size of 6.04 KB.

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

... Continue reading "Radar" »

Arpa

Classified in Electronics

Written at on English with a size of 4.31 KB.

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.     

... Continue reading "Arpa" »

Arpa

Classified in Electronics

Written at on English with a size of 3.97 KB.

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

... Continue reading "Arpa" »

Power control.

Classified in Electronics

Written at on English with a size of 40.96 KB.

To control by PWM requires 2 factors:

1-crossing detection signal by 0.

2-? determine the time, every time you walk by 0.

to detect the zero crossing can be performed
through an operational amplifier connected
comparator.

gYQAAAAASUVORK5CYII =

TCA = 785
Pin Symbol Function
1 GND Earth
2 Q2 *Output 2 Inverted
3 Output U QU
4 Q1 * Output 1 Inverted
5 5Synchronizing voltage Vsync (to detect
zero crossing)
6 Inhibitor
7 QZ Z Output
8 8 Vref voltage stabilized (continuous signal for the
integrator)
9 9 ramp resistor R9 (for the integrator)
10 C10 ramp Capacitance (for the integrator)
11 11 V11 Control Voltage (for comparator)
12 12 C12 pulse Extension
13 LLong pulse
14 Q1 Output 1
15 Q2 Output 2
16 l sSupply voltage.
2Q ==

English Grammar: Past Simple vs. Past Continuous, Used to, Modals, Reported Speech

Classified in Electronics

Written at on English with a size of 1.33 KB.

When past simple and while past continuous. Used to: affirmative - S+used to+v.ing, negative - S+didn't use to+inf, interrogative - Did+S+use to+inf? Yes, I did. No, I didn't. Active Voice: Subject+verb+D.C.+Complement

Passive Voice: Subject+verb+D.C. (by)+Complement

Modals

  • can/can't -> puede/no puede
  • could/couldn't -> podía/no podía
  • should/shouldn't -> debería/no debería -> consejo
  • must -> deber -> obligación
  • mustn't -> no deber -> prohibición
  • have to -> tener que
  • don't have to -> no tener que -> no obligación
  • may -> puedo que
  • might -> podía ser que -> posibilidad

Reported Speech

  • now -> then
  • today -> that day
  • tomorrow -> the next day/the following day
  • yesterday -> the previous day/the day before
  • next
... Continue reading "English Grammar: Past Simple vs. Past Continuous, Used to, Modals, Reported Speech" »

English Grammar: Verb Tenses and Adjectives

Classified in Electronics

Written at on English with a size of 1.28 KB.

INGREDIENTES:

  • Present Simple: pronoun + present form of verb.
  • Present Continuous: pronoun + am/is/are + verb + -ing.
  • Past Simple: pronoun + second column.
  • Past Continuous: pronoun + was/were + verb + -ing.
  • Past Perfect: pronoun + had + third column.
  • Present Perfect Simple: pronoun + have/has + third column.
  • Present Perfect Continuous: pronoun + have/has + been + verb + -ing.

MODO DE USO:

  • Extreme Adjectives: totally, completely, and absolutely.
  • Normal Adjectives: very, extremely, rather, and quite.
  • Both: really.
  • Vocabulary: u1 arrogant, bossy, calm, cheerful, clever, confident, friendly, funny, hard-working, impatient, lazy, nervous, nice, patient, quite, reliable, selfish, serious, shy, talkative, tidy, unfriendly, untidy. u2 break down, check in, get
... Continue reading "English Grammar: Verb Tenses and Adjectives" »

English Verb Tenses: Simple, Continuous, Perfect, and Future

Classified in Electronics

Written at on English with a size of 2.55 KB.

Presente simple

Afirmativa: persona + verbo (3a sg -s)(He, She, It) I play Yo juego

Negativa: persona + don't/doesn't(3a sg) + verbo You don't play

Interrogación: do/does(3a sg) + persona + verbo Does she play?

Presente continuo

Afirmativa: persona + to be (am, is, are) + verbo (-ing)I am playing Yo estoy juego

Negativa: persona + am not/ isn't/ aren't + verbo (-ing) You aren't playing

Interrogación: to be + persona + verbo (-ing) Is he playing?

Pasado simple

Afirmativa: persona+ verbo (-ed/ 2ª columna irregulares) I played Yo jugué

Negativa: persona + didn't + verbo He didn't play

Interrogación: did + persona + verbo Did you play?

Pasado continuo

Afirmativa: persona + to be en pasado (was/were) + verbo (-ing) I was playing Yo estaba jugando

Negativa:... Continue reading "English Verb Tenses: Simple, Continuous, Perfect, and Future" »

Wind and Solar Power: The Future of Energy?

Classified in Electronics

Written at on English with a size of 2.28 KB.

The Energy of Tomorrow

Wind Power: A Solution?

It is generally accepted that we will not be able to use oil and gas to power our homes forever. These energy forms contribute to pollution, and as a result, alternative, clean energy sources will be relied on more in the future. One of the most common alternative sources is wind power, but does this solve our energy problems?

It is well known that wind energy is a clean energy source. Not only is it sustainable, but it is also cheap. Furthermore, wind turbines perform reliably and are adaptable; they are perfect for both the city and the countryside. In countries such as Spain, more than 20% of the electricity used is already generated by wind turbines.

Disadvantages of Wind Power

However, there are... Continue reading "Wind and Solar Power: The Future of Energy?" »

Modal Verbs and Reported Speech

Classified in Electronics

Written at on English with a size of 3.65 KB.

Modals

Present

  • Advice: OUGHT TO EAT/ SHOULD VISIT/ SHOULDN’T EAT/ MUST WATCH
  • Obligation: MUST STUDY/ HAS TO HELP
  • Absence of obligation/necessity: DON’T HAVE TO GO/ NEEDN’T WEAR
  • Prohibition: CAN’T SMOKE / MUSTN’T TAKE

Past

  • Regret, criticism, or past advice: SHOULD HAVE ASKED /SHOULDN’T HAVE LEFT/ OUGHT TO HAVE TOLD
  • Past obligation: HAD TO SAVE
  • No past necessity: NEEDN’T HAVE RUSHED
  • Absence of past obligation: DIDN’T HAVE TO GIVE/ DIDN’T NEED TO GO

Present Deduction

  • Possibility or speculation: COULD RAIN/ MAY BE/ MIGHT NOT BE
  • Affirmative deduction: MUST BE
  • Negative deduction: CAN’T BE

Past Deduction

  • Past possibility: MAY HAVE LEFT/ MIGHT HAVE GIVEN
  • Past possibility that didn’t happen: COULD HAVE MADE
  • Logical conclusion about a past action:
... Continue reading "Modal Verbs and Reported Speech" »

Understanding Verb Tenses and Expressions in English

Classified in Electronics

Written at on English with a size of 1.99 KB.

Verb Tenses and Expressions in English

In this article, we will explore various verb tenses and expressions commonly used in English.

Past Perfect Tense

The past perfect tense is used to express an action that occurred before another action in the past. For example, 'I wish I had studied more for the exam.'

Conditional Sentences

Conditional sentences are used to express hypothetical situations. They can be formed using different verb tenses and expressions. For example, 'If I had more time, I would have gone to the party.'

Causative Verbs

Causative verbs are used to indicate that someone or something caused an action to happen. They are formed using the structure 'subject + have + object + verb (past participle)'. For example, 'She had her car repaired... Continue reading "Understanding Verb Tenses and Expressions in English" »