1) How many times can a locking plate be used? Report

once, then discarded

3 times, then discarded

indefinitely providing it is a good fit around the component to be locked

2) The taper of a standard taper pin is Report

1 in 20

1 in 36

1 in 48

3) When using a spring washer, the plain washer would be fitted Report

between spring and part

between head and spring

under the nut

4) How many times can you use a locking plate? Report

Until all the tabs have been broken off

As long as it remains serviceable

Once only

5) Wire locking approach angles should not be less than Report

10^o

45^o

90^o

6) A spring type washer when used on an aluminium component must be used Report

with a plain washer

by itself

with a tab washer

7) Nickel alloy steel split pins can be used Report

repeatedly provided they remain a good fit

with a spring washer and a stiff nut

only once, because the legs are spread and bent

8) A preload indicating washer is correctly loaded when Report

the inner ring rotates

the inner ring is gripped

the outer ring is gripped

9) The advantage of circlips is Report

it is cheap

it can be used for both inner and external applications

Both a and b

10) A press fit requires Report

the hole to be expanded by heat

some sort of driving force

the shaft to be shrunk by cooling

11) A non metallic locknut is Report

never re-used

never torqued

never used over 250 ^oF

12) Which can be re-used? Report

Locking plate, circlip, spring washer

Shake proof washer, spring washer, locking plate

Tab washer, circlip, locking plate

13) A tab washer has been removed after fitment for a short time from a non essential system, the tab washer may be Report

re-used

re-used if a spare is not available

not re-used

14) Taper pins are subject to what loads? Report

Tensile

Shear

Compressive

15) In the drawing, both bolts are correctly wire locked when Report

A is a right hand thread and B is a left hand thread

both A and B are right hand threads

both A and B are left hand threads

16) A turnbuckle locknut is a Report

stiff nut

castle nut

slotted nut

17) A spring washer Report

may be used a second time provided it is fitted the reverse way round

maybe used more than once provided it continues to provide an efficient lock

must not be used more than once

18) An internal circlip can be used to Report

retain a ball bearing in a housing

retain a ball bearing on a shaft

to do both of the above

19) A washer having both twisted teeth and spring actions is Report

AN970 large-area flat washer

AN936 shake-proof lock washer

AN935 split-ring lock washer

20) Split pins Report

may be used only once

may be used more than once

can be used more than once but depends on the material of the split pin

EASA Questions Module 6: Materials Set 10: Locking Devices

Set 1: Materials - Ferrous

Set 2: Materials - Ferrous

Set 3: Materials - Non-Ferrous

Set 4: Composite & Non-Metal

Set 5: Wooden Structures

Set 6: Fabric Covering

Set 7: Corrosion

Set 8: Screw Threads

Set 9: Bolts, studs & screws

Set 10: Locking devices

Set 11: Rivets

Set 12: Pipes and Unions

Set 13: Bearings

Set 14: Transmissions

Set 15: Control Cables

Set 16: Electrical Cables