Aircraft Electrical Systems Part 2

Question 1

If there is an area which contains a large number of positive ions and another area which contains a large number of electrons a -

Answer 1

continuous flow of electrons is set up, which is know as an electromotive force(EMF)

Question 2

Consider a battery with a negative pole terminal and a positive terminal. Which one possess excess electrons?

Answer 2

The negative pole

Question 3

Opposition to the flow of electrons is called?

and generates?

Answer 3

Resistance

Heat

Question 4

The rotating loop in an AC generator is called?

Answer 4

The armature

Question 5

The AC generator can be modified to produce a DC current, turning it into a DC generator, before leaving the generator by?

Answer 5

using a DC commutator

Question 6

considering a DC armature, viewing from the front with the North pole on the right. The side of the armature passing downwards of the north pole will always -

Answer 6

be connected to the negative bush

Question 7

considering a DC armature, viewing from the front with the North pole on the right. The side of the armature passing upward of the south pole will always -

Answer 7

be connected to the positive bush

Question 8

Which pole of a magnet is positively charged?

Answer 8

The south pole

Question 9

considering a DC generator:

Control of the voltage output is usually accomplished by varying the strength of the magnet using some of the generated current, which is coiled to the magnet, this is called?

Answer 9

Self-excited

Question 10

what does this definition explain:

This term refers to the stage, or position, of an alternating current expressed in degrees from 0 to 360 during a cycle.

Answer 10

Phase

Question 11

Stator is relevant to which generator?

Answer 11

AC alternator

Question 12

A single-phase AC alternator rotor consist of?

Answer 12

two poles of opposite polarity

Question 13

The type of generator/alternator that is not self excited?

Answer 13

The AC alternator

Question 14

Considering the alternator:

As the rotor turns it induces a current in the coils which is converted into DC, without the use of a commutator, by a -

Answer 14

rectifier

Question 15

Three phase alternator output industry standard is?

Answer 15

400 Hz

Question 16

The three phase frequency can be controlled with following formula:

Answer 16

Frequency = number of poles x number of rotor revolutions / 60

Question 17

If there is no control over the RPM of an alternator, the frequency of its output will vary with engine RPM. Such an alternator is referred to as a -

Answer 17

frequency wild alternator

Question 18

To maintain the constant frequency required for AC systems a method of ensuring that the generator is driven at a constant speed is required. The solution to this is the -

Answer 18

Constant Speed Drive

Question 19

The CSD is located between -

Answer 19

the engine and the generator

Question 20

Transformers are used to?

Answer 20

convert AC supply at one voltage and frequency to AC at a different voltage, whilst keeping the frequency the same.

Question 21

Transformers are only used in -

Answer 21

AC systems