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Screw Thread and Fastener Quiz

Total questions: 56

Worksheet time: 28mins

Name
Class
Date
1.

The prominent point at the top of a screw thread is called the:

a)

Root

b)

Crest

c)

Flank

2.

The bottom of the thread groove is the:

a)

Crest

b)

Root

c)

Flank

3.

The slope between the root and crest is the:

a)

Flank

b)

Pitch

c)

Lead

4.

The angle between two adjacent flanks is the:

a)

Crest angle

b)

Thread angle

c)

Lead angle

5.

The major diameter of a parallel screw thread is:

a)

Root diameter of male threads

b)

Crest diameter of male threads / root of female threads

c)

Pitch diameter of both

6.

The minor diameter is:

a)

Crest diameter of female threads

b)

Root diameter of male threads / crest of internal threads

c)

Pitch diameter

7.

Thread pitch is defined as:

a)

Distance between adjacent thread forms in the same axial plane

b)

Axial advance per two turns

c)

Angle between flanks

8.

Lead of a single-start thread equals:

a)

Twice the pitch

b)

The pitch

c)

Half the pitch

9.

In unified designation 10-32, '32' indicates:

a)

Major diameter in inches

b)

Threads per inch

c)

Key number

10.

In the designation 1/4-28 UNF, '1/4' is:

a)

Pitch in inches

b)

Diameter in inch

c)

Threads per inch

11.

A screw pitch gauge is used to:

a)

Measure major diameter

b)

Determine thread pitch quickly and accurately

c)

Measure thread angle

12.

Helical gears are:

a)

Noisier than straight spur gears

b)

Much more silent than gears with straight teeth

c)

Only for low speed

13.

A taper thread is formed on:

a)

A cone

b)

A cylinder

c)

A sphere

14.

Special fasteners (e.g., Hi-Lok, Lockbolt) generally consist of:

a)

Single-piece rivet

b)

Close-tolerance pin and a collar or nut

c)

Self-tapping screw

15.

When used in CFRP, special nuts/collars:

a)

Are standard steel only

b)

Must be specially specified per repair procedure

c)

Are not allowed

16.

Taper-Lok fasteners are:

a)

Tapered bolt with self-locking nut and integral washer

b)

Blind rivets

c)

Sheet metal screws

17.

Bolts are available with head types such as:

a)

Square only

b)

Hexagonal, 12-point, protruding, countersunk

c)

Slot and Pozidriv

18.

Materials for aircraft bolts include:

a)

Plastics and brass

b)

CRES, steel alloy, titanium

c)

Wood and aluminium only

19.

Aircraft bolts can be identified by:

a)

Color of the shank

b)

Code marking on the bolt head

c)

Washer thickness

20.

Torque values for fasteners are normally found in:

a)

AMM Chapter 24

b)

SRM Chapter 51

c)

MEL

21.

In materials thicker than 2.4 mm, threads allowed within the hole are:

a)

None

b)

Max 2 thread pitches

c)

Any number

22.

In materials thinner than 2.4 mm, threads allowed within the hole are:

a)

No thread pitches within the hole

b)

Max 1 pitch

c)

Max 3 pitches

23.

Maximum number of washers permitted to adjust grip length:

a)

One total

b)

Three (one under head, up to two under nut)

c)

Unlimited

24.

Standard airframe bolts are used with:

a)

Slotted engine nuts only

b)

Castle nuts for shear/tension as specified

c)

No locking devices

25.

A stud is:

a)

A headed fastener

b)

A rod threaded at each end with plain middle, no head

c)

A roll pin

26.

Self-tapping screws are used to:

a)

Secure thin-gauge sheet-metal forming their own threads

b)

Replace bolts in primary structure

c)

Safety wire anchors

27.

Self-tapping screw heads may be:

a)

Slotted or cross recessed

b)

Hex with drilled head only

c)

12-point only

28.

A shear castle nut is used:

a)

Only on clevis bolts for shear loads

b)

For tension loads only

c)

On engines only

29.

A castle nut may be used:

a)

Only with shear loads

b)

For shear or tensile loads on standard airframe bolts

c)

Only with split pins in wood

30.

A slotted engine nut:

a)

Is approved for airframe use

b)

Is for engine applications and not approved for airframe

c)

Is plastic

31.

Nyloc stiffnuts lock by:

a)

Thread deformation

b)

Unthreaded nylon insert compressed by bolt thread

c)

Peening the nut

32.

Oddie stiffnuts lock by:

a)

Six tongues bent inward applying load on the thread

b)

Left-hand thread

c)

Set screw

33.

High-temperature locknuts materials include:

a)

CRES, steel alloy; some silver-plated

b)

Brass only

c)

Magnesium

34.

Silver-plated nuts should NOT be used against:

a)

Aluminium

b)

Titanium

c)

CRES

35.

Low-temperature self-locking nuts should not be used above:

a)

121°C (250°F)

b)

177°C (350°F)

c)

93°C (200°F)

36.

Wire thread inserts (Heli-Coil) are used to:

a)

Reduce bolt length

b)

Protect/repair threads in soft materials

c)

Increase pitch

37.

Heli-Coil inserts are manufactured from:

a)

Round wire formed to diamond-shaped cross-section

b)

Flat strip steel

c)

Cast bar

38.

Heli-Coil internal threads provide:

a)

Undersize threads only

b)

Free running or screw-lock types

c)

Left-hand only

39.

Fitting Heli-Coils requires:

a)

Standard tap only

b)

Special-size tap and gauges from manufacturer

c)

No gauging

40.

Before tapping for an insert, ensure:

a)

Hole is angled for chip clearance

b)

Hole is square, correct depth; swarf removed

c)

No lubrication used

41.

Safetying is the process of:

a)

Painting fastener heads

b)

Securing fasteners to prevent loosening from vibration

c)

Measuring torque

42.

Common safetying methods include:

a)

Wirelocking, cotter pins, lock-washers, locking plates, snap-rings, self-locking nuts

b)

Glue and tape

c)

Welding

43.

Common spring materials include:

a)

High carbon spring steel, stainless steel, non-ferrous; high-temperature alloys

b)

Lead and tin

c)

Wood fibers

44.

Springs are often used on:

a)

Journals of shaft and axles for load support

b)

Painted surfaces

c)

Fuel tanks as baffles

45.

Rolling-element bearings are primarily designed to take:

a)

Radial and/or axial loads

b)

Only bending loads

c)

Thermal loads

46.

Common bearing lubricants include:

a)

Oil, grease, and sometimes water (special cases)

b)

Only dry film

c)

Kerosene

47.

Bearing play refers to:

a)

Excess paint

b)

Internal clearance within the bearing

c)

Outer race thickness

48.

Typical bearing elements include:

a)

Outer ring, inner ring, cage, rolling elements, lubrication, seals

b)

Bolt, nut, washer

c)

Rotor and stator only

49.

Another way to describe bearing components is:

a)

Inner race, outer race, rolling elements and cage

b)

Hub and key only

c)

Cap and cotter

50.

Shafts coupled with gears or chains are used to:

a)

Change direction of motion and transmit power

b)

Provide electrical bonding

c)

Increase corrosion

51.

Chain wheels (sprockets) are:

a)

Bearings

b)

Wheels used with chains to transmit power

c)

Only decorative

52.

Couplings are used to:

a)

Connect two shafts together

b)

Secure fabric covering

c)

Join electrical wires only

53.

Belts run on:

a)

Pulleys

b)

Keys

c)

Threads

54.

Gears may be:

a)

Straight (spur), helical, or circular (bevel)

b)

Only worm gears

c)

Only spur

55.

A transmission element is any component that:

a)

Only stores energy

b)

Transmits motion or power between parts

c)

Measures temperature

56.

Cable end fittings are used to:

a)

Decorate cables

b)

Terminate and attach control cables to components

c)

Increase cable diameter

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