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Module 5 > 5.6 (a) > Flashcards

5.6 (a) Flashcards

1
Q

What does the CPU (microprocessor) do?

A

It performs all of the mathematical and logic functions by manipulating the data in the memory

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2
Q

What is ROM?

A

Read only memory

- contains the main programme telling the CPU what to do, when to do it and how to do it

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3
Q

What is RAM?

A

Random access memory

- temporary storage until the data is needed for processing

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4
Q

What is the purpose of the I/O (input/output device)?

A

It provides the interface between the CPU and the outside world

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5
Q

What are the types of buses?

A

Data bus
Address bus
Control bus

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6
Q

What is the purpose of the data bus?

A

It is used to carry the associated data associated with a memory or I/O transfer

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7
Q

What is the purpose of the Address bus?

A

It specifies the memory location or I/O port involved

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8
Q

What is the purpose of the control bus?

A

It is made up of various control lines generated by the CPU

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9
Q

What is hardware?

A

The parts and devices use to process the digital data

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10
Q

What is software?

A

The programmes and instructions for the CPU

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11
Q

What is RAM also referred to as?

A

Volatile memory

- unsaved data is lost at power off

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12
Q

What is ROM also referred to as?

A

Non-volatile memory

- data and programming functions stored in the ROM are not lost at power off

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13
Q

What is a PROM?

A

Programmable read only memory

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14
Q

What does EPROM stand for?

A

Erasable programmable read only memory

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15
Q

What does EAROM stand for?

A

Electrically alterable read only memory

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16
Q

What is the advantage of using EAROM than using EPROM?

A

Each individual element of the memory can be changed without erasing all of the data in the other elements

17
Q

How does EPROM work?

A

It works by first erasing the existing programme (by using UV light) from the integrated circuit (IC) pack. It’s then reprogrammed with a series of 1’s and 0’s

18
Q

When first manufactured, what is important to remember about ROM?

A

It is not usually changeable after manufacture due to a special masking technique adopted

19
Q

What is a reference computer?

A

A computer that may be used as a source of information/data.

  • reference signals from this computer may be self contained
  • it only provides outputs
20
Q

What is an IRS?

A

Inertial reference system (a type of reference computer)

- using laser gyro’s and accelerometer’s

21
Q

What are examples of IRS computers?

A
  • Autothrottle
  • flight control computers
  • pilots horizontal situation indicators
  • FMC (flight management computer)
22
Q

How are computers more often classified as?

A

Classified on their tasks rather than by analogue, digital or hybrid

23
Q

What is an information computer?

A

A computer that collects, processes and displays data.

24
Q

What are examples of information computers?

A
  • maintenance computers

- EICAS (engine indication and crew alerting system)

25
Q

What are Storage/Monitor computers?

A

Computers that retain information provided to them by other systems and computers.
- they generally do little signal processing

26
Q

What is an example of Monitor/Storage computer?

A

An electronic engine control monitor(EECM)

27
Q

What are controlling computers?

A

Computers with a primary task of controlling something

28
Q

What is an example of a controlling computer?

A

The flap/slat electronic unit (FSEU)

- monitors and controls the flap/slat position

29
Q

What is an interactive computer?

A

A computer that can perform several different tasks depending on operator inputs.

30
Q

What is an example of an interactive computer?

A

The flight management computer (FMC)

- the flight crew can enter information via the CDU (control display unit)

31
Q

What are the 3 main types of computers used on aircraft today?

A

Analogue
Digital
Hybrid

32
Q

Many problems arose from improper handling of new technology LRU’s. What was the unserviceability rate of the new technology found in the same test conditions as the old ones?

A

It was three to four times higher

33
Q

Why is a faulty integrated circuit hard to inspect by maintenance shop personnel?

A

The automatic testing equipment are often not able to discover the problem

Module 5 (3 decks)

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