Mock ACRM Terms

thermoplastic

A category of plastic material that is capable of softening or flowing "when reheated is described as a

(a) thermoplastic (c) thermoelastic

(b) thermosetting (d) Acrylic

ferrous metals

Magnetic particle inspection is applicable to

(a) all metals

(b) ferrous metals

(c) nonferrous metal

(d) wood, composite & metals

Barcoal

A destructive testing equipment that measures resistance to penetration.

(a) Brinell (c) Rockwell

(b) Vickers (d) Barcoal

are less subject to corrosion than uncoated aluminum alloys

Clad aluminum alloys are used in aircraft because they

(a) are less subject to corrosion than uncoated aluminum alloys.

(b) are much expensive

(c) are generally thinner

(d) have better conductive property

MIG

GMAW is also known as

(a) TIG

(b) Resistance welding

(c) MIG

(d) Spot Welding

Alodine is used

Alodizing is the process by which

(a) Alodine is used

(b) the part is sprayed by chemicals

(c) the part is submerged in an electro-chemical bath

(d) an alclad for metal is added

fiber tipped pen

What is the most suitable writing material for aircraft metal parts

(a) chalk (c) fiber tipped pen

(b) scribed (d) Pt:ntel Pen

not permitted

Welding over brazed or soldered joints is:

(a) not permitted

(b) permissible to mild steel

(c) as long as same metal is used

(d) perrnitted to a certain degree

larger diameter tube with fishmouth and rosette welds

Engine mount members should preferably be repaired by using a

(a) larger diameter tube with fishmouth and no rosette welds

(b) larger diameter tube with fishmouth and rosette welds

(c) smaller diameter tube with fishmouth and rosette welds

(d) smaller diameter tube with fishmouth and no rosatte 11velds

Society of Automotive Engineers

SAE stands for?

(a) Society of Aerospace Engineers

(b) Standard Aerospace Equipment

(c) Society of Automotive Engineers

(d) Standard Aircraft Equipment

1100

Which of the following is not considered ferrous alloy/metal?

(a) Iron (c) Steel

(d) Stainless Steel (d) 1100

Wet and dry process materials.

What two types of indicating mediums are available for magnetic particle inspection?

(a) Wet and dry process materials. (c) High retentivity and low permeability material.

(b) Iron and ferric oxides. (d) magnetic fillings

45°

Which type crack can be detected by magnetic particle inspection using either circular or longitudinal magnetization?

(a) 45° (c) Longitudinal

(b) transverse (d) none of the above

isopropyl alcohol

The most common deicing fluid used on aircraft propeller is?

(a) water (c) ethyl alcohol

(b) isopropyl alcohol (d) liquid nitrogen

Skydrol

Which of the following is phosphate-ester based fluid.

(a) MIL-H-83282

(b) Skydrol

(c) MIL-H-5606

(d) MIL-H-6083

check valve

Its primary purpose is to prevent flow to the other direction

(a) pressure relief valve (c) check valve

(b) pressure pump (d) selector valve

hydraulic fluid

Aircraft Shock normally contains

(a) pneumatic fluid

(b) pressurized nitrogen

(c) hydraulic fluid

(d) Liquid nitrogen

blind rivet

Pop rivets are good example of?

(a) Solid Shank rivet

(b) special rivets

(c) blind rivet

(d) special fasteners

High Density Polyethylene (HDPE)

Honeycomb skin structure is commonly made of the following except?

(a) Fiberglass (c) Aramid

(b) High Density Polyethylene (HDPE) (d) PhEmolic

Young's Modulus

In the stress strain diagram, the constant of proportionality E stands for?

(a) Young's Modulus (c) Modulus of Rigidity

(b) Hooke's law (d) Elasticity

Acrylic

Flexiglass a well known brand name is what type of plastic?

(a) Acrylic (c) Tetrafluoroethylene

(b) Acetate (d) Polypropylene

Kerosene

Jet A-1, Jet B are aircraft fuels that are primarily made of?

(a) Kerosene (c) Hydrocarbons

(b) naphtha (d) Aroma

Tensile Test

Considered one of the major form of destructive testing that measures the tensile strength of the material.

(a) Hardness Test (c) Tensile Test

(b) Fatigue test (d) Bending Test

Fuselage

ATA 53 is?

(a) Fuselage

(b) Nacelles/Pylons

(c) Door:>

(d) Windows

pulleys

How are changes in direction of a control cable accomplished? ·

(a) pulleys (c) Gusset

(b) fairleads (d) Bell Cranks

7-19

Identify the cable that is used in primary control systems and in other places where operation over pulleys is frequent.

(a) 7-6 (c) 7-19

(b) 1-19 (d) none of the above

separation of the laminates

When inspecting a composite panel using the ring test tapping method, a dull thud may indicate

(a) separation of the laminates. (c) an area of too much matrix between fiber layers

(b) less than full strength curing of the matrix. (d) Lower stress concentrations.

Filler rod should be the same composition as base metal

Which statement best describes magnesium welding?

(a) filler rod should be zinc

(b) magnesium can be welded to other metals

(c) it is impossible to weld magnesium because it is flammable

(d) Filler rod should be the same composition as base metal.

S

The classification for high tensile strength fiberglass used in aircraft structures is

(a) S

(b) E

(c) G

(d) F

not permitted

Welding over brazed or soldered joints is

(a) not permitted

(b) permissible only for aluminium

(c) permissible for mild steel

(d) permissible to some ferrous metals

helium or argon, or a mixture of helium and argon

The shielding gases generally used in the Gas Tungsten Arc (GTA) welding of aluminium consi.st of

(a) a mixture of nitrogen and carbon dioxide (c) helium or argon, or a mixture of helium and argon.

(b) nitrogen or hydrogen (d) a mixture of nitrogen and hydrogen.

5056 aluminum

Which rivet is used for riveting magnesium alloy structures?

(a) 5056 aluminum (c) Monel

(b) Mild Steel (d) lncone

cotter pin

Which is an acceptable safety device for a castle nut when installed on secondary structures?

(a) safety wire (c) locknut

(d) safety pin (d) cotter pin

alloying

The process of combining two metals to produce the desired quality from each other.

(a) metallurgy (c) alloying

(b) coldworking (d) heat treatment

24 months

Under part 43 the FAA specifies that the transponder be checked every?

(a) 12 months (c) 24 months

(b) 6 months (d) 3 months

14

FAR is what part of CFR

(a) 11

(b) 12

(c) 23

(d) 14

liquid

. Which of the following is not necessary to cause corrosion?

(a) electrolyte (c) Anode

(b) cathode (d) liquid

Honeycomb

The most common type of sandwich/core structure.

(a) Honeycomb

(b) foam

(c) corrugated

(d) PET

Class B

Flammable liquids are under what classification of fire?

(a) Class A

(b) Class C

(c) Class B

(d) Class D

a mixture of sodium chlorate and iron powder

42. A chemical oxygen generator normally contains?

(a) a mixture of sodium chlorate and iron powder

(b) gaseous oxygen

(c) compressed liquid oxygen

(d) mixture of oxygen and nitrogen

2 D of the rivet shank

The standard minimum edge distance for countersunk rivets is?

(a) 2 1/2 D of the rivet head (c) 2 D of the rivet head

(b) 2 1/2 D of the rivet shank (d) 2 D of the rivet shank

American Society for Testing and Materials

ASTM stands for

(a) American Standard for Testing Materials

(b) American Society for Testing and Materials

(c) American Standard for Testing and Materials

(d) American Society for Testing Materials

white

The color of aluminum's corrosion is?

(a) red

(b) white

(c) pink

(d) orange

stainless steel

What is generally used in the construction of aircraft engine firewalls?

(a) stainless steel (c) Monel

(b) lnconel (d) Clad Aluminum

99 percent commercially pure aluminum

The aluminum code number 1100 identifies what type of aluminum?

'(a) 99 percent aluminum (c) 99 percent pure aluminum

(b) 99 percent commercially pure aluminum (d) Aluminum containing 11% impurity

the major alloying element

In the four-digit aluminum index system number 2024, the first digit indicates

(a) minor alloying element (c) the major alloying element

(b) the percent of alloying metal (d) it is obusely aluminum

MMEL

It is an approved document created specifically to regulate the dispatch of an aircraft type with inoperative equipment.

(a) MMEL (c) COL

(b) MEL (d) STC

STC

It is an approved type certificate (TC) issued when an aircraft is modified from its original design.

(a)MMEL (b)COL

(b) MEL (d) STC

station numbers

Numbers allocated to certain components, e.g. frames and ribs, to indicate their positions within the structure. The numbers may represent in inches the distance from a datum point which could be the fuselage, nose or the wing root.

A. station numbers

B. frame numbers

C. line numbers

D. base numbers

if the same quality wood is used in both

Laminated wood spars may be substituted for solid rectangular wood spars

A. only in certain instances where the primary load is shared by one or more other original structural member.

B. only upon specific approval by the manufacturer or the FAA.

C. if the same quality wood is used in both.

D. any wood will do

Front spar

The dihedral angle of the wing may be measured by placing a straightedge and level protractor on the

A. Datum line.

B. Front spar.

C. Wing tip.

D. Center of gravity

intergranular corrosion

A type of corrosion that attacks along the grain boundaries of the metal.

A. fretting corrosion

B. intergranular corrosion

C. pitting corrosion

D. filiform corrosion

monocoque structure

Fuselage construction that relies largely on the strength of the skin or covering is a

A. monocoque structure.

B. semi-monocoque structure.

C. truss type structure.

D. semi-truss type structure

No external bracing is needed

Which statement is true regarding a cantilever wing?

A. No external bracing is needed.

B. It requires only one lift strut on each side.

C. It has nonadjustable lift struts.

D. none

longerons and stringers

Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are called

A. spars and ribs.

B. longerons and stringers.

C. spars and stringers.

D. formers and stringers

fuselage

In ATA numbering system, what is ATA chapter 53?

A. stabilizers

B. wings

C. fuselage

D. engine

galvanic corrosion

Corrosion occurs between two dissimilar metals makes electrical contact with the presence of an electrolyte

A. fretting corrosion

B. galvanic corrosion

C. filiform corrosion

D. intergranular corrosion

ultrasonic inspection

What type of inspection can determine delamination damage of a composite structure?

A. ultrasonic inspection

B. eddy current inspection

C. liquid penetrant inspection

D. magnetic particle inspection

1/8 inch

What is the smallest size cable that may be used in aircraft primary control systems?

A. 1/8 inch.

B. 1/4 inch.

C. 5/16 inch.

D. 1/3 inch.

glue

The strength of a well designed and properly prepared wood splice joint is provided by the

A. bearing surface of the wood fibers.

B. glue.

C. reinforcement plates.

D. all of the above

laminated wood

Is made up of two or three pieces of thin wood glued together with the same direction.

A. laminated wood

B. plywood

C. solid wood

D. sandwich structure

copper

Major alloying element of a 2024 aluminum alloys.

A. manganese

B. copper

C. silicon

D. silver

when a joint has separated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue

Glue deterioration in wood aircraft structure is indicated

A. when a joint has separated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue.

B. by any joint separation.

C. when a joint has separated and the glue surface shows pieces of wood and/or wood fibers clinging to the glue.

D. A and B

magnesium

Major alloying element of a 5056 aluminum alloys.

A. copper

B. magnesium

C. zinc

D. manganese

the grain is perpendicular to the skin

When balsa wood is used to replace a damaged honey-comb core, the plug should be cut so that

A. the grain is perpendicular to the skin.

B. the grain is parallel to the skin.

C. it is about 1/8-inch undersize to allow sufficient bonding material to be applied.

D. the grain is slanted to the skin

separation of the laminates

When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate

A. separation of the laminates.

B. an area of too much matrix between fiber layers.

C. less than full strength curing of the matrix.

D. B and C

pot life

The length of time that a catalyzed resin will remain in a workable state is called the

A. pot life.

B. service life.

C. shelf life.

D. safe life

compression failure

A faint line running across the grain of a wood spar generally indicates

A. compression failure.

B. shear failure.

C. decay.

D. torsion failure

magnetic particle inspection

Which is the most effective inspection to determine cracks in steel?

A. eddy current inspection

B. tap-test inspection

C. magnetic particle inspection

D. visual inspection

shear loads

A well designed rivet joint will subject the rivets to

A. tensile load.

B. compressive loads.

C. shear loads.

D. torsion loads

To join and reinforce intersecting structural members

What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?

A. To join and reinforce intersecting structural members.

B. To provide access for inspection of structural attachments.

C. To hold structural members in position temporarily until the permanent attachment has been completed.

D. To hide the jointing section

by the manufacturer and do not require heat treatment before being driven

Aluminum Alloy 2117 rivets are heat treated

A. by the manufacturer and requires heat treatment before being driven.

B. by the manufacturer and do not require heat treatment before being driven.

C. and should be placed in the elevated temperature before being driven.

D. none of the above.

Three times the thickness of the thickest sheet

The general rule for finding the proper rivet diameter is

A. 1/3 times the thickness of the thickest sheet.

B. Three times the thickness of the thickest sheet.

C. Three times the thickness of the material.

D.1/3 time the thickness of the material

zone 500

In aircraft zoning system, what is the major zone for Left Wing?

A. zone 200

B. zone 700

C. zone 500

D. zone 600

Two times the diameter of the rivet shank

What is the minimum edge distance for aircraft rivets?

A. Two times the diameter of the rivet head.

B. 2.5 times the diameter of the rivet shank.

C. Two times the diameter of the rivet shank.

D. 2.5 times the diameter of the rivet head

3 or 5 % of the total material thickness on each side

What is the thickness of the cladding in an clad aluminum sheet?

A. 3 or 5 % of the total material thickness on each side.

B. 3 or 5 % of the base material thickness on each side.

C. 2 or 4 % total in two sides of the total base material thickness

D. 2 or 4 % of the base material thickness on each side

diameter of the rivets being used

A factor which determines the minimum space between rivets is the

A. edge distance.

B. diameter of the rivets being used.

C. pitch distance.

D. thickness of the sheet metal.

Fretting corrosion is occurring between the rivets and the skin

What is indicated by a black "smoky" residue streaming back from some of the rivets on an aircraft?

A. Fretting corrosion is occurring between the rivets and the skin.

B. Exfoliation corrosion is occurring inside the structure.

C. The rivets were excessively work hardened during installation.

D. Intergranular corrosion due to dissimilar metals being used.

To retard age hardening

What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment?

A. To retard age hardening.

B. To relieve internal stresses.

C. To accelerate age hardening.

D. To harden the material.

stringers

The longitudinal members serves for stiffening the metal skin and prevent it from bulging or buckling under severe stresses.

A. stringers

B. frames

C. gussets

D. longerons

preventive maintenance

It is defined as simple or minor preservation operations and the replacement of small standard parts not involving complex assembly operations.

A. annual check/inspection

B. minor alteration

C. preventive maintenance

D. maintenance check

airframe major alteration

Changes to the empty weight or empty balance which results in an increase in the maximum certificated weight or center-of-gravity limits of the aircraft.

A. airframe major alteration

B. airframe major modification

C. airframe major repair

D. airframe minor modification

powerplant major alteration

Removal of accessories that are listed as required equipment on the aircraft or engine specification.

A. powerplant major repair

B. powerplant major modification

C. powerplant major alteration

D. powerplant minor repair

fail safe

Relies upon a duplication of certain structural members to ensure that if one member failed, the other would assume the load of the failed member.

A. fail safe

B. safe life

C. damage tolerance

D. factor of safety

hardness

The property of a material that enables it to resist penetration, wear, or cutting action or permanent distortion.

A. malleability

B. hardness

C. strength

D. elasticity

ductility

The property which allows metal to be drawn, bent or twisted into various shapes without breaking.

A. brittleness

B. ductility

C. malleability

D. elasticity

Larger diameter tube with fishmouth and rosette weld

Engine mount members should preferably be repaired by using a:

A. Larger diameter tube with fishmouth and rosette weld

B. Smaller diameter tube with fishmouth and rosette welds

C. Larger diameter tube with 30deg.cuts and rosette weld

D. Larger tube diameter with fishmouth and no rosette welds

A universal head

An AN470 rivet is

A. A flat head

B. A universal head

C. A countersink head

D. A blind rivet

A flame with excess of acetylene

A reducing flame is

A. A small soft flame used for sheet welding

B. The same as an oxidizing flame

C. The same as neutral flame

D. A flame with excess of acetylene

If necessary to reach a plane at which the inspection can be done

When can an aircraft be operated within 100-hour inspection overdue?

A. If necessary to reach a plane at which the inspection can be done

B. If aircraft is equipped with an hour meter

C. When the aircraft is operated under a progressive inspection program

D. Only when the aircraft is operated under continuous airworthiness program

Fairlead

To prevent a cable from chafing or slapping against parts of the aircraft during movement or in flight, the cable is secured by a

A. Bushing

B. Grommet

C. Fairlead

D. Clamp

AN456

The AN designation of a brazier head rivet is

A. AN435

B. AN456

C. AN441

D. AN425

Monel

Which rivet is used for riveting nickel-steel alloys?

A. 2017 aluminum

B. Mild steel

C. Monel

D. 2024 aluminum

Selfloc

Turnlock fasteners are extensively used in aircraft construction. Which type of fasteners does not belong in the group?

A. Airloc

B. Selfloc

C. Dzus

D. Camloc

Magnaflux

Cracks in magnetic material which are not revealed by visual inspection may be detected by

A. Dye penetrant

B. Eddy current

C. Magnaflux

D. Zyglo

For safety wiring

The drilled head steel bolt is used as a means

A. For decorative purpose

B. To lighten the bolt

C. For safety wiring

D. To install a cotter pin

The threaded rod ends should be checked for the amount of thread engagement by means if the inspection hole provided

Which statement concerning the 100-hour inspection of an airplane equipped with a push-pull tube type control system is TRUE?

A. The threaded rod ends should not be adjusted in length for rigging purposes because the rod ends have been properly positioned and slaked during manufacture

B. The threaded rod ends should be checked to determine that the ball bearing end is properly safetied to the push-pull rod with brass or stainless steel safety wire

C. The terminal end threads of the turnbuckles should be visible through the safety hole in the barrel

D. The threaded rod ends should be checked for the amount of thread engagement by means if the inspection hole provided

Pop Rivets

A rivet that is useful for temporarily lining up holes.

a. Pop Rivets c. Friction Lock Rivets

b. Cherrymax Rivets d. None of the Above

Climate Change

All factors contribute to structural deterioration except for one.

a. Unforeseen Loading c. Fracture

b. Fatigue d. Climate Change

galvanizing

The process of applying zinc as an outer layer of a metal to prevent corrosion is called

a. galvanizing. c. nitriding.

b. carbonizing. d. None of the Above