11.6 - Electrical Power Flashcards

1
Q

Where is the power produced in a DC generator?

A

In the armature (rotor)

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2
Q

A circuit generator, the regulator is a ___________ between the _________ and ground

A

A circuit generator, the regulator is a variable resistor between the generator field and ground

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3
Q

Paralleling P-Terminals do what?

A

Paralleling P-terminals compare voltage to ensure they share the load

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4
Q

Small business jets use?

A

starter-generators

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5
Q

Modern aircraft use ______ alternators

A

brushless

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6
Q

A brushless alternator consists of 3 separate fields

A
  1. PMG - Permanent Field
  2. Exciter field
  3. Output field
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7
Q

What does a current transformer do?

A

A CT (current transformer) senses output current

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8
Q

An IDG consists of what

A

IDG = CSD + Alternator

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9
Q

Where can you reset a CSD generator?

A

Only on the ground

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10
Q

Explain a VSCF

A

VSCF = Variable Speed Constant Frequency

>Reliability

>Lightweight

>Solid state

>DC alternator -> output DC

>Next gen

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11
Q

What is the reason for a current protection device (fuse)?

A

To protect the wiring

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12
Q

Aircraft that are equipped with fuses are required to carry atleast ______ of any one type of fuse spare

A

10%

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13
Q

What is the advantage of mercury cells?

A

Mercury cells have a large capacity and a long life for their small size

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14
Q

What is the voltage of a lithium cell and what is it used for on aircraft?

A

Lithium cell = 2.8 - 3.6 V

They are used in ELT

(Emergency Locator Transmitter)

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15
Q

How is the state of charge of a Ni-cd determined?

A
capacity test (by the level of the electrolyte present)
Potassium hydroxide and water
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16
Q

How do you minimise thermal runaway? (Ni-cd)

A

Constant current charging

17
Q

How can cell memory be restored?

A

Cell memory can be restored by completely discharging it and overcharging it to approx 140% of it’s ampere-hour capacity

Deep Cycling

18
Q

What light will you get for ground power available on aircraft?

A

Blue