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wood and fibric exam

Total questions: 78

Worksheet time: 39mins

Name
Class
Date
1.

The main longitudinal members of a wooden wing are called:

a)

Ribs

b)

Spars

c)

Booms

2.

Sitka spruce spars are commonly:

a)

Only solid

b)

Solid or laminated

c)

Only laminated

3.

Why are laminated spars used?

a)

Weight increase

b)

Easier to source defect-free pieces

c)

Better paint adhesion

4.

Compression members between spars are made of:

a)

Steel or alloy tubes

b)

Fabric ribs

c)

Plastic spacers

5.

Drag wires run from:

a)

Front spar inboard to rear spar outboard

b)

Rear spar inboard to front spar outboard

c)

Tip rib to root rib

6.

Anti-drag wires run from:

a)

Rear spar inboard to front spar outboard

b)

Wing tip to fuselage

c)

Rib to rib

7.

Box spars increase:

a)

Paint coverage

b)

Bending and torsion strength

c)

Weight imbalance

8.

Plywood webs in box spars:

a)

Block airflow

b)

Act as shear panels

c)

Reduce glue use

9.

Ribs form the:

a)

Wing aerodynamic shape

b)

Landing gear support

c)

Instrument panel

10.

Most critical wooden member in flight:

a)

Stringer

b)

Spar

c)

Tape strip

11.

Before detailed inspection, aircraft should be placed in:

a)

Wet hangar

b)

Dry, ventilated hangar

c)

Open sun

12.

Musty smell indicates:

a)

Fresh glue

b)

Fungal/damp condition

c)

UV damage

13.

Moisture accumulates at:

a)

Top surfaces

b)

Lowest enclosed areas

c)

Near wing tips

14.

Glue line inspection requires:

a)

Leaving paint

b)

Scraping to bare wood

c)

Burning the surface

15.

Feeler gauges used must be:

a)

Thick

b)

Thinnest possible

c)

Bent pieces

16.

Glue line must be inspected only when wood is:

a)

Wet

b)

Dry and unclamped

c)

Frozen

17.

Elongated bolt holes are repaired by:

a)

Larger bolts only

b)

Installing steel bushes

c)

Adding dope

18.

Compression failure is detected by:

a)

Torch along grain

b)

Hammer tapping

c)

Smelling glue

19.

Drain holes blocked =

a)

No problem

b)

Moisture retention and decay

c)

Better pressure

20.

Acceptable timber moisture content:

a)

10% ±1

b)

15% ±2

c)

22% ±2

21.

Oven dry testing temperature:

a)

80–90°C

b)

100–105°C

c)

140°C

22.

Discard timber end before moisture testing:

a)

2 in

b)

6 in

c)

12 in

23.

Limit of grain inclination (Grade A spruce):

a)

1 in 10

b)

1 in 15

c)

1 in 5

24.

Dote disease appears at:

a)

Mid-span

b)

Tree base

c)

Tip only

25.

Ring shake is caused by:

a)

UV

b)

Frost after rain

c)

High glue heat

26.

Pin-knot clusters should be:

a)

Accepted

b)

Rejected

c)

Filled with resin

27.

Rift-sawing is to improve:

a)

Grain stability

b)

Bolt clearance

c)

Fabric tension

28.

Crumbling wood spots indicate:

a)

Dry rot

b)

Excess paint

c)

Excess glue

29.

Synthetic adhesive system is:

a)

One-part

b)

Two-part (resin & hardener)

c)

Powder only

30.

Powder resin is mixed with:

a)

Water

b)

Fuel

c)

Oil

31.

Maturation time refers to:

a)

Cure after gluing

b)

Wait before applying after mixing

c)

Storage life

32.

Adhesive storage must be below:

a)

10°C

b)

21°C

c)

40°C

33.

Bad resin appears:

a)

Gel-like or sticky

b)

Transparent

c)

Dry powder

34.

Glue surfaces must be:

a)

Painted

b)

Lightly sanded and dry-fit

c)

Wetted

35.

Butt joint test acceptable failure:

a)

25% fibers

b)

50% fibers

c)

75% fibers

36.

Wet test immersion period:

a)

2–3 hrs

b)

24 hrs

c)

1 week

37.

Pre-coating is needed when:

a)

Both woods are dense

b)

Soft meets dense

c)

Dense meets dense

38.

Glue applied to:

a)

One surface

b)

Both surfaces

c)

None

39.

Warp runs:

a)

Crosswise

b)

Lengthwise

c)

Diagonal only

40.

Natural fabrics degrade due to:

a)

Fuel

b)

UV & mildew

c)

Static only

41.

Polyester and glass-fibre are:

a)

Natural

b)

Artificial

c)

Not used

42.

Fabric storage:

a)

20°C dry, dark

b)

Cold and wet

c)

Sunlight

43.

Fabric covering area must be:

a)

Painted

b)

Clean and taped

c)

Left rough

44.

Bias covering angle:

a)

0°

b)

45°

c)

90°

45.

Balloon seam stitch count:

a)

2 per cm

b)

4 per cm

c)

8 per cm

46.

Lap seam usage:

a)

Always

b)

Only if specified

c)

Never

47.

Overhand stitch count:

a)

3 per cm

b)

1 per cm

c)

6 per cm

48.

Stringing cord:

a)

Linen single strand

b)

Wire

c)

Plastic

49.

Standard rib pitch:

a)

75 mm

b)

37 mm

c)

150 mm

50.

Prop-blast pitch:

a)

75 mm

b)

37 mm

c)

100 mm

51.

Serrated tape width:

a)

25 mm

b)

37 mm

c)

10 mm

52.

Bee wax is used on thread to:

a)

Stiffen

b)

Ease sewing

c)

Color

53.

Fabric on metal surfaces needs:

a)

Direct bond

b)

Etch primer then dope

c)

Grease coat

54.

Drain eyelets placed:

a)

Anywhere

b)

As per spec drawings

c)

Top only

55.

Marine fabric eyelets must be:

a)

Standard

b)

Shrouded type

c)

Removed

56.

Martin clips require:

a)

Rivets

b)

Screw + washer + tape underneath

c)

Glue only

57.

Two dope types:

a)

PU and epoxy

b)

Nitrate & butyrate

c)

PVC

58.

First dope on natural fabric:

a)

Butyrate

b)

Nitrate

c)

Aluminium

59.

Fungicide needed for:

a)

Polyester

b)

Natural fabric

c)

Glass-fibre

60.

Aluminium dope purpose:

a)

Gloss

b)

UV protection

c)

Weight reduction

61.

Retarder thinners:

a)

Speed drying

b)

Slow drying to prevent blush

c)

Increase solids

62.

Spray room conditions:

a)

21–26°C / 45–50% RH

b)

10°C / 90% RH

c)

40°C / 10% RH

63.

Portable tester works at:

a)

45°

b)

90°

c)

Any angle

64.

Portable tester lowest reading is:

a)

Ignored

b)

Considered

c)

Averaged

65.

Patch after tester puncture:

a)

10 mm

b)

50–75 mm

c)

No patch needed

66.

Polyester tensioning done by:

a)

Dope

b)

Heat

c)

Water

67.

First coat for polyester:

a)

Butyrate

b)

Nitrate thinned 2–3:1

c)

Aluminium

68.

Fungicide for polyester first coat:

a)

Required

b)

Not needed

c)

Optional

69.

Glass-fibre priming uses:

a)

Nitrate

b)

Butyrate only

c)

Epoxy

70.

Glass-fibre weave fill needs:

a)

1 coat

b)

Up to 5 coats

c)

No coats

71.

Straight tear on fabric repaired by:

a)

Glue

b)

Baseball stitch + tape + patch

c)

Rivets

72.

Lock knot frequency in repair stitching:

a)

Every 150 mm

b)

Every 600 mm

c)

No knots needed

73.

Woods frame repairs allowed up to:

a)

50 mm²

b)

50 mm square

c)

Only 10 mm

74.

Darning allowed only if tear is:

a)

100 mm

b)

≤50 mm wide

c)

200 mm

75.

Before stitching repairs, dope around tear must be:

a)

Left as is

b)

Removed with thinners

c)

Painted over

76.

What is the main material used for aircraft wooden spars?

a)

Oak

b)

Mahogany

c)

Sitka spruce

77.

Why are laminated spars often used instead of solid spars?

a)

They are equally strong and cheaper

b)

They are stronger and cheaper

c)

They are lighter but equally strong

78.

Aluminium dope protects fabric from:

a)

Heat

b)

UV radiation

c)

Corrosion

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