Part-66 Module 6 practice test

Question 1

How is steel annealed?

Accepted Answer

Heated above critical, cooled very slowly in the furnace

Answer

Heated above critical, then quenched in water

Answer

Heated above critical, then cooled in still air

Question 2

In the SAE four-digit system for steels, what does the first digit show?

Accepted Answer

The main alloying element

Answer

The carbon content in hundredths

Answer

The hardness after heat treatment

Question 3

Which aluminium alloy series has zinc as its main alloying element?

Accepted Answer

7xxx

Answer

2xxx

Answer

6xxx

Question 4

What does the temper designation -T6 mean for an aluminium alloy?

Accepted Answer

Solution treated and artificially aged

Answer

Solution treated and naturally aged

Answer

Strain hardened and stabilised

Question 5

What are the two basic parts of a fibre-reinforced composite?

Accepted Answer

Fibres and a resin matrix

Answer

A core and a paint finish

Answer

Rivets and metal sheet

Question 6

What is a prepreg?

Accepted Answer

Cloth pre-impregnated with resin, kept cold

Answer

Cloth already cured that cannot be shaped

Answer

A type of honeycomb core material

Question 7

What is exfoliation corrosion?

Accepted Answer

Intergranular attack lifting metal in layers

Answer

Corrosion caused by two rubbing surfaces

Answer

Corrosion under paint in fine filaments

Question 8

What is corrosion of metals?

Accepted Answer

Electrochemical attack by the environment

Answer

Mechanical wear caused by rubbing

Answer

Cracking caused by fatigue loading

Question 9

What does the thread designation 1/4-28 UNF mean?

Accepted Answer

1/4 in diameter, 28 threads per inch, fine

Answer

1/4 in length, 28 mm thread pitch, fine

Answer

1/4 in diameter, 28 mm thread length

Question 10

How must safety wire be installed?

Accepted Answer

So that any tendency of the fastener to loosen tightens the wire

Answer

So that it pulls the fastener in the loosening direction

Answer

As loosely as possible

Question 11

What is the maximum operating temperature of a nylon (fibre) insert self-locking nut?

Accepted Answer

About 121 °C (250 °F)

Answer

About 650 °C

Answer

About 40 °C

Question 12

What does the MS20470 rivet designation describe?

Accepted Answer

A universal head rivet

Answer

A 100° countersunk head rivet

Answer

A blind rivet

Question 13

What is the diameter of an AN6 bolt?

Accepted Answer

0.375 in

Answer

0.6 in

Answer

0.1875 in

Question 14

What length of shank should protrude beyond the material before driving a solid rivet?

Accepted Answer

1.5 times the rivet diameter

Answer

0.5 times the rivet diameter

Answer

3 times the rivet diameter

Question 15

What is the flare angle of standard AN aircraft flared tube fittings?

Accepted Answer

37°

Answer

45°

Answer

60°

Question 16

A spring has a rate of 20 N/mm. How far does it compress under a load of 100 N?

Accepted Answer

5 mm

Answer

2,000 mm

Answer

0.2 mm

Question 17

Which bearing type can carry both radial and thrust loads?

Accepted Answer

Tapered roller bearing

Answer

Plain cylindrical roller bearing

Answer

Needle roller bearing

Question 18

A driving gear with 20 teeth meshes with a driven gear of 60 teeth. If the driver turns at 900 rpm, what is the speed of the driven gear?

Accepted Answer

300 rpm

Answer

2,700 rpm

Answer

900 rpm

Question 19

How many threads may be exposed outside a turnbuckle barrel at each end?

Accepted Answer

No more than three

Answer

At least ten

Answer

Any number, as long as it is safetied

Question 20

What is the purpose of the shield (screen) on a shielded cable?

Accepted Answer

To reduce electromagnetic interference

Answer

To increase the current capacity

Answer

To make the cable waterproof