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AMT 210 Airframe Electrical > Power Generation > Flashcards

Power Generation Flashcards

Aircraft Batteries and Power Generation

1
Q

In aviation what types of batteries are mostly used?

A

Lead-Acid
Nickle-Cadmium

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2
Q

Where is the type of battery to be used with the aircraft found?

A

TCDS

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3
Q

Is changing the type of battery in an aircraft a major alteration?

A

Yes

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4
Q

What is amp-hour?

A

As it sounds, producing 1 amp for 1 hour

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5
Q

What is an open circuit voltage?

A

Voltage measured when there is no load applied to the battery?

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6
Q

What is closed circuit voltage?

A

Voltage measured while a load is applied to the battery?

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7
Q

What is internal resistance?

A

The resistance present inside a battery while connected to a load

IR=OCV-CCV/I

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8
Q

How does constant-voltage charging work?

A

As the battery is charging the battery voltage is rising and the current drops off. This is also the way mos in service batteries are charged

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9
Q

How does constant-current charging work?

A

Charger varies the voltage to supply a constant current to the battery. The state of charge of the battery must be know or overcharging is likely. Used with Ni-cad batteries.

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10
Q

How do you neutralize the acidic electrolyte in a lead acid battery?

A

A solution of baking soda and water is used

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11
Q

How do you neutralize the basic electrolyte in a Ni-Cad battery?

A

A solution of boric acid and water

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12
Q

Which lead do you connect first on a battery?

A

The red or positive, then the black or negative

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13
Q

SLA

A

Sealed Lead Acid

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14
Q

VRLA

A

Valve Regulated Lead Acid

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15
Q

RG

A

Recombinant Gas

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16
Q

AGM

A

Absorbed Glass Mat

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17
Q

Gel Cell

A

Electrolyte mixed with silica

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18
Q

What is thermal runaway?

A

The low resistance of Ni-Cads allows high current flows. These high current flows raise temperatures, especially in the cells in the center, and this has the effect of lowering the resistance even more. This creates a cycle that could have on cell destroy itself and heat up cells around it contribution to other runaways

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19
Q

What is cell memory?

A

A cell that is repeatedly subjected to shallow discharge and recharge will eventually lose some of its capacity and not except a full charge

20
Q

What is Faraday’s Law?

A

Relative motion between a wire and a magnetic field generates an electromotive force and a flow of current in a closed circuit.

21
Q

Power Generation and Transformation

A

Generator-Magnet is stationary
Alternator-Magnet is moving
Transformer-Inductor

22
Q

How is AC transformed?

A

Inductors

23
Q

How is the voltage found in transformers?

A

Voltage is directly proportional to the number of turns

24
Q

How is the current found in a transformer?

A

inversely proportional to the number of turns

25
Q

How is the output of a electromagnetic power generation found?

A

The strength of the magnetic field
The number of conductors
The speed that the magnetic field is crossed

26
Q

What is pulsating DC

A

DC whose voltage periodically changes, but whose electrons always flow in the same direction.

27
Q

How does a shunt wound generator work?

A

The generator has the field in parallel to the armature.

28
Q

What is residual magnetism?

A

The magnetism that remains in the field frame of a generator when no current is flowing in the field coils

29
Q

What is residual voltage?

A

The voltage produced in a generator armature when the armature is rotated in the residual magnetism

30
Q

What is a carbon stack?

A

A kind of variable resistor. The stack is pressed together it has less resistance. The voltage coil creates a magnetic field that changes the pressure on the stack

31
Q

What is a voltage regulator?

A

A normally closed switch that is opened whenever there is voltage greater than desired in a parallel circuit. This limits the current going to the magnetic field

32
Q

What is a current limiter?

A

A normally close switch that is opened whenever there is a current greater than desired in a series circuit. This limits the current going to the magnetic field

33
Q

What is a reverse current relay?

A

A normally open switch which is held closed by a magnetic coil whenever there is sufficient output from the generator going through a parallel and a series circuit

34
Q

What are the three ways to create relative motion?

A

The magnetic field remains stationary and the conductor moves through it

The conductor remains stationary, and the magnetic field moves across it

The conductor and the magnetic field remain stationary and the strength of the magnetic field changes

35
Q

What is a commutator?

A

A mechanical rectifier mounted on the armature of a DC generator. Carbon brushes riding on the commutator carry current in and out

36
Q

What are series wound generator not practical?

A

They can’t be controlled

37
Q

What is a shunt wound generator?

A

The field is parallel to the generator

38
Q

How does a shunt field generator work?

A

By controlling the amount of current that goes through the field the output of the generator can be controlled

39
Q

Compound wound generator

A

Can be controlled adequately, and they can make more power than shunt wound. They are normally starter-generators

40
Q

What provides power in an alternator?

A

Brushes and slip rings

41
Q

What determines the frequency in a generator?

A

The speed at which the generator turns

42
Q

What is a CSD?

A

A constant speed drive that will cause the generator to turn and a certain speed. It is a variable displacement hydraulic pump driving a hydraulic motor

43
Q

What is CEMF?

A

Counter Electromotive Force is a back voltage created by moving the windings of the motor through the magnetic field

44
Q

Shunt wound motors

A

Produce a small amount of torque but have a constant operating speed

Direction of rotation can be controlled by direction of current flow in the field or the armature

45
Q

Series wound DC motors

A

Produce a large amount of torque initially.
As Speed increases, CEMF increases, torque drops off
Need a load
Direction of rotation controlled by direction of current flow in the field or the armature

46
Q

What type of motors are AC motors?

A

Induction motors. The current in the armature is induced from the field.

AMT 210 Airframe Electrical (9 decks)

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