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ULUÇ AGK > Electrics > Flashcards

Electrics Flashcards

1
Q

Connecting two 12V 40Ah capacity batteries in series will result in a total voltage and capacity respectively of

A

24V, 40Ah

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2
Q

The connection in parallel of two 12V 40Ah batteries –>

A

12V 80Ah

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3
Q

Lead Acid Batteries

If one of the 12 cells of a lead-acid battery is dead, the battery is UNSERVICABLE

The voltage, of a fully charged lead-acid battery cell is 2.2V

A test to assess the state of charge of a lead-acid battery would involve COMPARING THE “ON LOAD” AND OFF LOAD” BATTERY VOLTAGES

A
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4
Q

Alkali Battery (Nickel Cadmium)
*can be recharged
*low cost cycle
*tough

  • low energy density
  • memory effect
  • contains toxic metals

When carrying out a battery condition check using the aircraft voltmeter: a load should be applied to the battery in order to give a better indication of condition

The capacity of an accumulator is: the quantity of electricity that the battery can supply during discharge.

A
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5
Q

NiCad compared Lead Acid
*reduced charging time
*constant output voltage

A

Motor çalıştığında ammeter anlık olarak akım piki gösterir, bu normal. Ancak uzun süre devam ederse kontrol et.

Battery control unit, bataryayı izole eder:
*şarj tamamlandığında
*akü ısındığında.

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6
Q

Compass Deviation Magnetic Variance True

A

Compass Dairy Milk Very Tasty

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7
Q

DC generators are connected IN PARALLEL to provide maximum power.

A
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8
Q

Type of windings commonly used DC Starter motors are series wound

Series wound DC motors are best for application that require high startup torque, without the need for speed regulation.

A
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9
Q

Shunt wound DC motors are used in applications where the required startting torque is low, but good speed regulation is important

Compound wound hem paralel hem seri, yüksek tork yüksek

A

The conditions to be met to activate a shunt generator are:
Presence of a permanent field
Minimum rotation speed

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10
Q

Voltage Regulator

The power required for field excitation of the main rotor in modern constant frequency alternators is directly controlled by the VR

*Voltage regulator of DC generator is connected in series with the shunt field coil.

Assume a constant speed DC generator providing a constant output voltage. If the electrical load increases the VR will increase the intensity of the excitation current.

A

*VR DC jeneratörde paralel (shunt) bağlanan ekipmanlara seri bağlıdır.

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11
Q

BUSBAR - distribution point for electrical power

Vital busbars - undercarriage selection, emergency lighting, fire detection and extinguishing circuits

Essential busbars - supply equipment essential to ensure the safe flight of an aircraft

Non Essential busbars - galley supplies, cabin entertainment services

A
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12
Q

Hot buses or direct buses directly connected to ______

A

BATTERY

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13
Q

Generatros when connected to the same bus bar, are usually connected in ________ mode

A

Paralel

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14
Q

The services connected to a supply busbar are normally in parallel so that isolating individual loads decreases the bus bar current consumption

Because the connection in parallel of electrical equipment on an AC bus bar, isolation of individual equipments: decreases the bus bar current consumption ??

A
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15
Q

DC to AC - Inverter-Static Inverter

AC to DC - Transformer rectifier Unit (TRU)

A
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16
Q

Alternators vs Dynamos

And induced ??

A
17
Q

Şakir;)

Akım artar capasitor artar sa diye sorarsa her şey artıyor.

Paralel istiyoruz çünkü redundancy

A
18
Q

Capacitance duyduğunda aklına gelecek şey
Iki türlü yakıt ölçme yöntemimiz var. Birincisi şamandıra.

Büyük yolcu uçaklarında capacitance var.

A

Capacitance type fuel gauging system indicates the fuel qty by measuring the dielectric change between fuel and air.

19
Q

Yakıt kapasitanslı ölçümlerde kütle, şamandıralı ölçümleri hacimle ölçülür.

A

Float type hareketten etkilenir, sıcaklıktan etkilenir.

20
Q

Tranfo - küçük voltajı büyütür (vvs)

Uçakta da ateşleyici (spark plug, buji) benzer şekilde çalışıyor. Adı Magneto

A
21
Q

TRU - Transformer Rectifier Unit

A

AC akımı DC’ye çeviririz.

22
Q

Frequency = (RPM x Pole Pairs) / 60

In order to produce an alternating current 400Hz the number of pairs of poles equired in an AC generator running at 6000 rpm is?

A

400 = (6000*P)/60

P=4

23
Q

Paralel bağlayablimek için voltaj faz frekans üçünün de eşit olması lazım.

Titreşim harici hepsini sistem kontrol edfebiliyor.

A
24
Q

When the AC generator are connected in paralel, the reactive loads are balanced by means of the; excitation current / energising current

Real load sharing in a parallel AC system is achieved by; automatic adjustment of the torque on each generator rotor via the CSD unit

A
25
Q

CONSTANT SPEED DRIVE UNIT motor ile jeneratör arasında duran parça,
Sabit frekansta tutar.

The function of a CSD in an AC generating system is to drive the generator at a constant speed.

A
26
Q

Assuming a CSD fault is indicated, the CSD should be disconnected provided the engine is running.

A CSD of an AC generator may be disconnected in flight. The primary reason for disconnection are low oil pressure and/or high oil temperature of the generator drive.

A

Alternatörün RPM ini azaltmaya çalışıyor.

27
Q

IDG - Integrated Drive Generator

Is a electrical generator which provides electricity for the aircraft IDG provides electrical power for all the aircraft systems. It consist a generator and a constant speed drive (CSD)

A
28
Q

CSDU - Constant Speed Drive Unit

Disconnect during flight (not at IDLE) reset on ground after engine shut down only

AC generator driven by CSD requires a Voltage Regulator

Low oil pressure, high oil temp, vibration -> disconnect

Indications in cockpit are oil temp and l_pressure.

A
29
Q

Types of Breakers **

Persistant Phase imbalance / unbalance -> Tie Breaker
Underspeed fault -> Generator breaker

(Exciter counter relayand the generator breaker;)
AC generator fault
Pulling the fire shutoff handle
Persistent overvoltage fault
Persistent over excitation

( The exciter breaker, the generator breaker and the tie breaker;)
Persistent top excitation
Persistent under excitation

A
30
Q

Zener Diode _ _ _ _ _ _ _ stabilization

A

Voltage

31
Q

Communication frekans aralığı - 118-136 MHz arasındadır.

A
32
Q

IDG = CSDU + GEN

A

Motor çok hızlı döndüğünden dolayı CSDU yüksek RPM’i yağ ve hidrolikle 3000 rpm’e düşürüp alternatörü döndürüyor. Eğer zorlanırsa yağ basıncı düşüyor ve yağ sıcaklığı artıyor. Böyle durumda pilotlar CSDU yu disconnect ederek generatoru koruyor.

33
Q

BLEED AIR GÖREVLERİ

A

ANTI ICE
AIR COND
ENGINE START
HYDRAULIC POWER
WATER SYSTEM

34
Q

On detection of a persistent phase unbalance on an AC generator connected to the aircraft MAINS (tiebreaker😉), with another AC generator, the protection device opens:

A

Bu tarz sorularda “ne yapılırsa daha emniyetli olur” düşüncesinden ziyade “ne yapılırsa hem emniyetten ödün verilmez hem de elektrik devresindeki olabildiğince fazla bileşen işlevini sürdürür” yol haritasını takip etmek gerekir.
Uçaklarda motor sayısı kadar jeneratör bulunur ve bunlar devreye paralel bağlanır. Böylece hepsinden aynı anda azar azar tüketildiğinden sistemin toplam ömrü artmış olur! Paralel bağlanan jeneratörlerin voltajı, frekansı ve çalışma fazı AYNI olmak zorundadır.
Soruya göre jeneratörlerden birinde düzelmeyen faz uyumsuzluğu var. Jeneratör bozuk değil sadece doğru fazı yakalayamıyor o yüzden kapatmaya gerek yok ancak bu jeneratörü artık diğer jeneratörlerle paralel olarak KULLANAMAYIZ!
=> Problemli jeneratörü ortak devreden ayırmak zorundayız. Şimdi gelelim önemli nüansa. Sıkıntı yaşatan jeneratörü ortak dağıtım barasından sökmek isteseydik => “Generator Breaker” kullanırdık. EĞER problem yaşatan jeneratörü ANA DAĞITIM BARASINDAN(MAIN BUSBAR) SÖKMEK DURUMUNDA KALIRSAK => “TIE BREAKER” kullanmalıyız.
Pratik çözüm olarak; soruda “main” yazdığından cevapta “tie breaker” kesin geçecek. Jeneratör bozuk olmadığından başka bir tedbire gerek kalmayacak.

ULUÇ AGK (12 decks)

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