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Wooden Wing Structure Mr.aziz first 40 page

Total questions: 67

Worksheet time: 34mins

Name
Class
Date
1.

What are the main lengthwise members in a wooden wing structure called?

a)

Ribs

b)

Spars

c)

Stringers

2.

What is the main material used for aircraft wooden spars?

a)

Sitka spruce

b)

Mahogany

c)

Oak

3.

Why are laminated spars often used instead of solid spars?

a)

They look better

b)

They are stronger and cheaper

c)

They are lighter but equally strong

4.

What separates the spars in a truss-type wing?

a)

Drag wires

b)

Compression members

c)

Stringers

5.

What type of members take compressive loads between spars?

a)

Compression ribs

b)

Drag ribs

c)

Anti-drag wires

6.

What component holds the truss together in a wooden wing?

a)

Aluminum tubes

b)

Steel wires

c)

Wooden ribs

7.

What is the function of drag wires in a truss-type wing?

a)

Prevent forward movement

b)

Oppose rearward drag forces

c)

Prevent twisting

8.

What do anti-drag wires prevent?

a)

Wing bending

b)

Rearward movement

c)

Forward drag forces

9.

What is a box spar?

a)

A spar built with plywood sheets

b)

A hollow box-shaped spar between two booms

c)

A steel-reinforced spar

10.

What purpose does the box structure between spars serve?

a)

Increases wing flexibility

b)

Adds torsional and bending strength

c)

Reduces aerodynamic drag

11.

Box spars were pioneered during which era?

a)

WWII

b)

WWI

c)

Post-war period

12.

What materials connect the upper and lower belts of a wooden box spar?

a)

Aluminum webs

b)

Plywood webs

c)

Metal straps

13.

What do plywood webs in a box spar strengthen?

a)

Compression members

b)

Tension ribs

c)

Drag wires

14.

What is essential before inspecting wooden aircraft structure?

a)

Drying the aircraft

b)

Painting the wood

c)

Applying glue

15.

A musty smell during inspection indicates:

a)

Fuel leakage

b)

Fungus or dampness

c)

Glue failure

16.

Before starting inspection, where should the aircraft be kept?

a)

Outside in sunlight

b)

In a dry, well-ventilated hangar

c)

In humid conditions

17.

What is the first external check in wooden aircraft inspection?

a)

Check the varnish

b)

Look for gross deformation

c)

Test glue joints

18.

Which of the following can cause glue joint deterioration?

a)

UV exposure

b)

Temperature extremes and moisture

c)

Excessive varnish

19.

What promotes rapid deterioration inside structures?

a)

Fuel vapor

b)

Stagnant moisture

c)

Airflow

20.

Splits in proofed fabric covering indicate:

a)

Paint peeling

b)

Hidden plywood defects

c)

Over-tightened fabric

21.

Which tool is best used to inspect glue lines closely?

a)

Magnifying glass

b)

Flashlight

c)

Caliper

22.

When inspecting a glue line, paint coatings should be:

a)

Left intact

b)

Carefully scraped away

c)

Washed with solvent

23.

What indicates a defective glue joint?

a)

Smooth shiny surface

b)

Feeler gauge penetration possible

c)

Even color across glue line

24.

Why must the surrounding wood be dry when checking glue lines?

a)

Moisture closes the joint, hiding defects

b)

Dry wood prevents cracking

c)

Moisture interferes with varnish

25.

What can give a false impression of glue condition?

a)

Pressure from bolts or fittings

b)

Too much varnish

c)

Heat treatment

26.

What indicates dry rot in timber?

a)

Glossy surface

b)

Crumbling wood patches

c)

White fungus

27.

What does dark discoloration or grey streaks in wood indicate?

a)

Excess varnish

b)

Water penetration

c)

Fungus attack

28.

What can the corrosion of screws reveal?

a)

Glue quality

b)

Water soakage

c)

Fungus attack

29.

What type of screws are normally used in wooden structures?

a)

Stainless steel

b)

Plain brass

c)

Copper alloy

30.

When replacing screws, what rule is followed?

a)

Same size

b)

One size larger

c)

One size smaller

31.

What can blocked drain holes cause?

a)

Structural warping

b)

Water soakage

c)

Paint cracking

32.

Shrinkage of timber can cause:

a)

Tighter bolts

b)

Loosened fittings

c)

Reduced flexibility

33.

How can shrinkage be detected?

a)

Use of moisture meter

b)

Insert thin feeler gauge under fittings

c)

Tapping test

34.

What defect appears as elongated bolt holes?

a)

Crushing of fibers

b)

Glue failure

c)

Knot tear

35.

How are elongated bolt holes repaired?

a)

Filling with glue

b)

Installing steel bushes

c)

Inserting dowels

36.

What causes bruising and crushing of members?

a)

Over-tightening bolts

b)

Excess humidity

c)

UV exposure

37.

What is another term for compression failure?

a)

Compression shake

b)

Glue split

c)

Knot rupture

38.

How can compression failures be detected?

a)

Tapping the member

b)

Shining a light along the grain

c)

Soaking in water

39.

What causes ring-shake defects?

a)

Fungus growth

b)

Frost after rainfall

c)

Poor sawing

40.

What does dote disease look like?

a)

Grey patches

b)

Brownish-yellow oil-like spots

c)

White powdery rings

41.

What should be done with wood infected by dote disease?

a)

Dry and reuse it

b)

Treat with varnish

c)

Burn it

42.

Decay or rot appears as:

a)

Blue stain

b)

Brown, charred-like wood

c)

Glossy black marks

43.

What is the grain inclination limit for grade A spruce?

a)

1 in 12

b)

1 in 15

c)

1 in 10

44.

What is the grain inclination limit for grade B spruce?

a)

1 in 12

b)

1 in 15

c)

1 in 20

45.

What is the most dangerous type of timber shake?

a)

Compression-shake

b)

Heart-shake

c)

Ring-shake

46.

What type of defect is caused by frost after heavy rainfall?

a)

Heart-shake

b)

Ring-shake

c)

Pitch hole

47.

What should be the moisture content of seasoned timber used in aircraft?

a)

10% ± 1

b)

15% ± 2

c)

20% ± 3

48.

Which tool provides a quick moisture measurement?

a)

Hygrometer

b)

Marconi Moisture Meter

c)

Wood hydrometer

49.

The formula for moisture content uses:

a)

Dry weight and wet weight

b)

Volume and density

c)

Temperature and humidity

50.

Rift-sawing means cutting:

a)

Tangentially to the rings

b)

Along the radius of the annual rings

c)

Across the grain

51.

Tangential-sawing is also known as:

a)

Quarter sawing

b)

Slash sawing

c)

Rift sawing

52.

What do pitch holes normally appear near?

a)

Knots

b)

Heartwood

c)

Bark edge

53.

Blue stain occurs only in:

a)

Heartwood

b)

Sapwood

c)

Plywood

54.

What are gum pockets?

a)

Vertical or horizontal resin cavities

b)

Areas of fungal rot

c)

Knots filled with glue

55.

How should dead gum pockets be treated?

a)

Accepted

b)

Repaired

c)

Rejected

56.

Which type of knot has no fiber connection to the surrounding wood?

a)

Dead knot

b)

Bud knot

c)

Pin knot

57.

What is the usual diameter limit for acceptable knots?

a)

1/2 inch

b)

1/4 inch

c)

3/4 inch

58.

Clusters of pin knots in a board should be:

a)

Glued

b)

Rejected

c)

Repaired

59.

Why are synthetic resin adhesives used in wooden structures?

a)

To replace varnish

b)

To avoid stresses from mechanical joints

c)

To improve aerodynamics

60.

Synthetic resin adhesives consist of:

a)

Glue and powder

b)

Resin and hardener

c)

Varnish and solvent

61.

Synthetic resin adhesives develop strength through:

a)

Heat

b)

Chemical reaction between resin and hardener

c)

Air drying

62.

Powder resins must be mixed with:

a)

Water

b)

Alcohol

c)

Solvent

63.

Liquid resin is mixed with:

a)

Hardener

b)

Powder resin

c)

Water

64.

What is “maturation time” for adhesives?

a)

Time allowed for glue to dry

b)

Time between mixing and use

c)

Time to reach full strength

65.

What is “pot life” of an adhesive?

a)

Time until mixed adhesive becomes unusable

b)

Time before storage expires

c)

Duration between application and curing

66.

What should be done if the shelf-life of resin has expired?

a)

Add more hardener

b)

Use with extra curing time

c)

Dispose of it

67.

What storage temperature should not be exceeded for adhesives?

a)

15°C

b)

21°C

c)

30°C

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