module 6 revision 2.ppt

8/10/2019 Module 6 Revision 2.ppt

1/42

Module 6 Revision 2


2/42

Small areas of delamination or blistering of composite skin are repaired by:

a. hot bonding insertion repair

b. filling with resin and scarf repair

c. injecting with resin and applying pressure

c. injecting with resin and applying pressure


3/42

British Standard marking for nuts and bolts applies to:

a. BSF and ANF

b. BA and BSF

c. BSF bolts only

b. BA and BSF


4/42

The smallest BSF thread used on standard bolts is:

a. 3/16 of an inch

b. 5/16 of an inch

c. 1/4 of an inch

c. 1/4 of an inch


5/42

In a glass fibre composite structure, star crazing found on the top surface wouldindicate:

a. crack growth within the structure

b. de-lamination between the core of the composite

c. crushing of the matrix material

a. crack growth within the structure


6/42


7/42

A spiral spring would be used in an aircraft system to:

a. apply a torsion load to a shaft that will assist operation

b. eliminate the backlash in a gear train

c. provide a calibrated motive force within an instrument

b. eliminate the backlash in a gear train


8/42

A typical epoxy resin, is cured by adding together equal amounts of:

a. catalyst to accelerator

b. accelerator to hardener

c. hardener to resin

c. hardener to resin


9/42

The diameter of an internal thread can be checked using a:

a. GO and NOT GO plug gauge

b. plain ring gauge

c. GO and NOT GO screw ring gauge

a. GO and NOT GO plug gauge


10/42

When carrying out repairs to a Kevlar composite, the type of drill that wouldbe used is a:

a. sharp conventional high speed drill

b. spade bit or dagger

c. C-shaped Brad point drill

c. C-shaped Brad point drill


11/42

Cold flow' of a low -pressure hose is caused when:

a. the hose clips are over tightened

b. low temperatures turns the hose material brittle

c.

the material is exposed to excessive ultraviolet light

a. the hose clips are over tightened


12/42

Water contamination to the honeycomb of a composite structure, may be foundby:

a. eddy current

b. magnetic particle

c. radiography

c. radiography


13/42

The code -26J as part of a part number on the head of BS bolt indicates:

a. 2.6 inch plain shank length and 3/8 inch diameter

b. 1/8 inch diameter and 2.6 inch total length

c. 1/4 inch diameter 1.3 inch plain shank length

a. 2.6 inch plain shank length and 3/8 inch diameter


14/42

Shear bolts that are made of HTS will always have:

a. thin heads

b. medium heads

c. thick heads

a. thin heads


15/42

The nominal length of a mushroom headed screw is the:

a. length from the top of the screw to the end of the plain portion

b. plain portion length of the bolt

c. complete length of the threaded portion

c. complete length of the threaded portion


16/42

In a small hole repair, resin is generally reinforced with:

a. aluminium mesh

b. chopped glass fibres

c. twill fabric

b. chopped glass fibres


17/42

In a carbon fibre composite, moisture absorption is normally found by:

a. tap testing with a coin or hammer

b. x-ray photography because moisture meters don't work on all carbon fibres

c. moisture meter only as x-rays do not penetrate carbon fibres

b. x-ray photography because moisture meters don't work on all carbon fibres


18/42

A low-pressure pipe coupling could consists of a:

a. flared pipe with a collar held against a cone shaped adapter by a union nut

b. union nut compressing a rubber seal fitted to an un-flared pipe

c. conical nipple brazed onto a pipe and held against a cone adapter by a union nut

b. union nut compressing a rubber seal fitted to an un-flared pipe


19/42

A plug screw gauge measures:

a. major, minor and effective diameters of internal threads

b. major and effective diameters of external threads

c. major diameters of external and internal threads

a. major, minor and effective diameters of internal threads


20/42

A valve spring is said to have a progressive rate because it is:

a. fitted to control valves with the closest coils towards the stems in order to giveit a rate of stiffness

b. manufactured with its coils unevenly spaced so that it gives a different rate asit is compressed

c. compression spring with evenly spaced coils that requires additional force as itis compressed

b. manufactured with its coils unevenly spaced so that it gives adifferent rate as it is compressed


21/42

Epoxy resins are used within the aerospace industry because:

a. its shrinking rate during bonding is low

b. all epoxy resins have the same curing time

c. they shrink into contour shapes during curing

a. its shrinking rate during bonding is low


22/42

A conical spring would be fitted instead of the standard cylinder spring when a component:

a. requires a spring of a higher compression rate

b. has a limited amount of space in the axial direction

c. is with oversized valves so requires a spring with a larger base diameter

b. has a limited amount of space in the axial direction


23/42

The springs used to eliminate lost motion in instruments are generally:

a. leaf springs

b. tension springs

c. spiral springs

c. spiral springs


24/42

The centre section of a repair to a small hole in a fibreglass-reinforced structurewould be have the plugged with:

a. nomex honeycomb insert

b. chopped glass fibre

c. polyurethane foam

b. chopped glass fibre


25/42


26/42

A buttress thread:

a. combines low friction with resistance to shear

b. combines low friction with resistance to compression

c. takes axial load in both directions

a. combines low friction with resistance to shear


27/42

In a laminated structure, barely visible damage (BVD) could be found by:

a. eddy current type non-destructive testing

b. taking x-rays photography of the structure

c. using a magnetic particle test

b. taking x-rays photography of the structure


28/42

Delamination in a fibre-reinforced structure can be found by:

a. using a bonding tester

b. tapping the suspect area with a coin

c. flexing the structure by hand

b. tapping the suspect area with a coin


29/42

Large area damage in a composite material may be caused by:

a. moisture entering surface cracks

b. chaffing between core and skin

c. localised impacts in glass fibre composite

a. moisture entering surface cracks


30/42

A sandwich structure could be inspected for damage by:

a. pressing on the structure and measuring the indentation

b. lightly tapping with a coin or small hammer to hear a change in ringing tone

c. flexing the structure to see de-lamination points

b. lightly tapping with a coin or small hammer to hear a change in ringing tone


31/42

In a fibreglass composite structure, a crack in a would appear as a:

a. straight or narrow line passing through the material

b. star shaped design around the area of crack initiation

c. a series of small circular rings spinning out from the centre of crack formation

b. star shaped design around the area of crack initiation


32/42

In composite materials, a peroxide catalyst is:

a. an oxidising agent and can burst into flames

b. a bonding agent and is not highly flammable provided that it is stored atvery low temperatures

c. not particularly flammable but can cause other substances to burst intoflames

c. not particularly flammable but can cause other substances to burst into flames


33/42

Small scratches can be repaired in a composite by:

a. injecting the scratch by a hypodermic needle filled with resin

b. filling the damaged area with a mixture of resin and hardener

c. removing the damaged area then patching with a composite repair

b. filling the damaged area with a mixture of resin and hardener

Wh i i ll h l i l fib i f d


34/42

When repairing a small hole in a glass fibre reinforced structure:

a. the surface laminations is replaced after filling the hole a piece of lightaluminium alloy honeycomb material

b. the hole can be filled by using a plug made up of Kevlar and held in place byreplacement surface laminations

c. The surface laminations would be repaired after the centre section is filledwith chopped fibres and resin

c. The surface laminations would be repaired after the centresection is filled with chopped fibres and resin

Th l d i t t t lti th d i


35/42

The lead in a two-start multi thread is:

a. twice the pitch

b. half the pitch

c. same as the pitch

a. twice the pitch


36/42

A bolt with a B.A. thread would have a thread angle of:

a. 47

b. 55

c. 60

a. 47


37/42

A GO and NOT GO screw plug gauges ensure that:

a. the thread crest diameter is not fully formed correctly

b. an internal thread is correct

c. an external thread is correct

b. an internal thread is correct


38/42

A hexagon headed bolt has the following identification marked on the head A25 -3.5 L, the 3.5 L indicates the:

a. plain shank length is 3.5 inches

b. overall bolt length is 3.5 inches

c. overall bolt length is 35 mm

a. plain shank length is 3.5 inches

Self tapping screws are suitable for:


39/42

Self-tapping screws are suitable for:

a. heavily loaded structural attachments

b. mounting components to heavy gauge material where access to both sidesis available

c. mounting light components on thin sheet metal where there is access toonly one side of the work

c. mounting light components on thin sheet metal where there is access

to only one side of the work

The hosepipe in a low-pressure system of an aircraft:


40/42

The hosepipe in a low-pressure system of an aircraft:

a. could suffer from cold-flow if the hose clips are over tightened

b. should be fitted in tension and the hose should be compatible with the system fluid

c. should not be lubricated to aid fitting as it can inhibit proper sealing

a. could suffer from cold-flow if the hose clips are over tightened


41/42

In order to eliminate backlash in instruments a:

a. cylindrical helical torsion spring should be fitted

b. tension spring should be fitted

c. spiral spring should be fitted

c. spiral spring should be fitted

B i ill W h


42/42

Beiville Washers are use:

a. as return springs in wheel brake

b. as remote control system return springs

c. to provide rebound damping in hydraulic valves

a. as return springs in wheel brake

module 6 revision 2.ppt

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