Part-66 Module 5 practice test

Question 1

Which information is normally shown on a primary flight display (PFD)?

Accepted Answer

Attitude, airspeed, altitude and heading

Answer

Engine parameters and crew alert messages

Answer

The route map with weather radar

Question 2

What is the decimal value of the binary number 11010?

Accepted Answer

26

Answer

13

Answer

11,010

Question 3

What does a digital-to-analogue converter (DAC) do?

Accepted Answer

Turns a digital number into a proportional voltage

Answer

Turns a varying voltage into a digital number

Answer

Stores digital data when power is off

Question 4

How many transmitters may be connected to one ARINC 429 bus?

Accepted Answer

One

Answer

Up to 20

Answer

Any number

Question 5

How many bits are in an ARINC 429 data word?

Accepted Answer

32

Answer

16

Answer

64

Question 6

What is the output of a two-input AND gate?

Accepted Answer

1 only when both inputs are 1

Answer

1 when either input is 1

Answer

1 only when both inputs are 0

Question 7

What does De Morgan's theorem state for two inputs?

Accepted Answer

NOT (A AND B) = (NOT A) OR (NOT B)

Answer

NOT (A AND B) = (NOT A) AND (NOT B)

Answer

NOT (A OR B) = (NOT A) OR (NOT B)

Question 8

What is ROM used for in avionics computers?

Accepted Answer

Holding programs that must survive power-off

Answer

Holding temporary calculation results only

Answer

Holding data only while power is applied

Question 9

What are the main parts of a central processing unit (CPU)?

Accepted Answer

ALU, control unit and registers

Answer

Keyboard, screen and mouse

Answer

Power supply, fan and case

Question 10

What is the effect of bending an optical fibre too tightly?

Accepted Answer

Light escapes and the fibre may crack

Answer

More light is reflected into the core

Answer

The signal speeds up through the bend

Question 11

What light sources are used to transmit signals into optical fibres?

Accepted Answer

LEDs or laser diodes

Answer

Incandescent bulbs

Answer

Fluorescent tubes

Question 12

What is an active matrix LCD?

Accepted Answer

An LCD with a transistor at each pixel

Answer

An LCD without individual pixels

Answer

A type of cathode ray tube

Question 13

What does a liquid crystal display (LCD) need to make its image visible in a cockpit?

Accepted Answer

A backlight

Answer

Nothing; LCDs emit their own light

Answer

A high-voltage electron beam

Question 14

Why are ESD-protective workstations fitted with grounded mats?

Accepted Answer

To hold work and devices at ground potential

Answer

To keep the bench warm

Answer

To insulate devices completely from ground

Question 15

How is an electrostatic sensitive device (ESDS) normally identified?

Accepted Answer

A hand in a triangle, crossed by a line

Answer

A red painted case with yellow stripes

Answer

A radiation trefoil symbol on the label

Question 16

Why must the part number of loaded software be checked after a software load?

Accepted Answer

To confirm the approved version is installed

Answer

To check the colour scheme of the display

Answer

Because software changes its own part number

Question 17

Which standard is commonly used for the development assurance of airborne software?

Accepted Answer

ED-12C / DO-178C

Answer

ARINC 429

Answer

ED-14 / DO-160

Question 18

What does electromagnetic compatibility (EMC) mean?

Accepted Answer

Working without causing or suffering interference

Answer

Producing strong radio signals

Answer

Being sealed against water

Question 19

What is the main function of a flight management system (FMS)?

Accepted Answer

Navigation and performance along a route

Answer

Controlling cabin temperature

Answer

Recording cockpit voices

Question 20

What is the purpose of a central maintenance computer (CMC) or system?

Accepted Answer

To gather system faults for troubleshooting

Answer

To fly the aircraft automatically

Answer

To control cabin entertainment