Notes, abstracts, papers, exams and problems of 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

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.

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.

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

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

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" »

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:

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" »