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WorksheetsModule 6: Review Questions
Total questions: 45
Worksheet time: 23mins
When drilling stainless steel, use a.
drill ground to 120 °, slow cutting speed.
drill ground to 90 °, fast cutting speed.
drill ground to 90 °, slow cutting speed.
How is a material galvanised?.
Sprayed with nickel solution.
Packed in a drum containing zinc dust and heated.
Dipped in a bath of molten zinc.
What temperature would steel be tempered at?.
At the annealing temperature.
Above the annealing temperature.
Below the annealing temperature.
Tempering steel gives.
greater brittleness.
greater hardness.
relief of internal stress after hardening.
The addition of chromium to steel will produce.
toughness.
hardness.
ductility.
Chromium added to plain carbon steel.
increases it's resistance to corrosion.
turns it into a non-ferrous alloy.
makes the metal softer.
The purpose of case hardening is to.
produce a hard case over a tough core.
reduce the carbon in the steel.
introduce carbon into the steel.
At normal temperatures HC steel is harder because.
it has more austenite.
of the % of carbon in the granules.
it has less austenite.
Nitriding is.
tempering.
anodising.
case hardening.
Medium carbon steels have a carbon content of.
0.3 - 0.5 %.
0.5 - 0.8 %.
0.8 - 1.05 %.
The most suitable mixture for a salt bath operation is.
20% nitrate of soda and 80% sodium nitrate.
90% nitrate of soda and 10% sodium nitrate.
70% sodium chlorate and 30% sodium nitrate.
How many times can clad alloy be heat treated?.
Once only.
3 times.
as many times as required.
The symbol 'W' on a material indicates.
it is for use on aircraft mainplanes only.
it has been solution treated and will respond effectively to precipitation treatment.
it is for workshop use only.
For a particular metal material, what conditions are best to minimise creep?.
Low stress, low temperature.
Low stress, high temperature.
High stress, low temperature.
What is the effect of precipitation heat treatment on aluminium?.
It speeds up age hardening process.
It delays the age hardening process.
It softens the material to allow it to be worked.
Aluminium exposed to air will.
oxidise and become weaker.
oxidise and become electrically insulated.
oxidise and become stronger.
What care should you take with 2024-T3?.
Do not scratch or make nicks in it.
Do not bend at sharp angles.
Do not remove the surface of the sheet metal.
Composition of silver solder is.
tin and lead.
tin, lead and silver.
tin, lead, silver and antimony.
If aluminium alloy is not quenched within the minimum time allowed after heat treatment is it will be.
subject to corrosion.
malleable.
brittle.
Anodizing protects alloy metal from corrosion and does what else?.
Seals the surface from moisture.
Makes a good surface for paint to adhere to.
Makes the surface alkaline.
If caustic soda turns a material black what is it?.
Aluminium alloy.
Alclad.
Aluminium.
What chemical is used to identify aluminium alloys?.
Caustic soda.
Copper sulphate.
Nitric acid.
Pure aluminium is.
highly resistant to corrosion.
not resistant to corrosion.
reasonably resistant to corrosion.
Precipitation treating makes the metal.
Precipitation treating makes the metal.
less strong and hard.
harder, stronger and less ductile.
A material has the code 2024-TH6 on it. Which part of the code indicates the percentage of the alloying element?.
H.
20.
6.
Aluminium alloyed primarily with magnesium is numbered.
2025.
5025.
1025.
Heat treatment is shown on a British aluminium alloy by a.
letter and number code.
number code.
letter code
Non heat treatable materials.
cannot be hardened.
can be hardened by strain hardening or cold working.
can be hardened by annealing.
Which of the following metals is an aluminium silicon alloy used mainly for casting?.
Alclad.
Aldrey.
Alpax.
Aircraft skin is joggled to.
provide smooth airflow at faying surfaces.
make a frame lighter but stronger.
conform to the aircraft contour.
A 14 gauge cable when compared to an 18 gauge cable has.
the same current rating.
higher current rating.
lower current rating.
In a front release connector, the pin will be.
released from the front and extracted from the rear.
released from rear and extracted from the front.
released from the front and extracted from the front.
An interconnect cable has what insulation?.
same thickness as airframe cable.
thicker than airframe cable.
thinner than airframe cable.
Why is the ground side of an electrical power conductor usually connected to a male connector?
To make installation of the connector easier.
To reduce the chance of an accidental short.
To reduce the chance of corrosion affecting the pins.
Maximum temperature of tin coated copper cable is.
200 °C.
260 °C.
105 °C.
Plug pins are numbered.
from the outside in - clockwise.
from the inside out - clockwise.
from the inside out - anticlockwise.
Equipment wire.
is flexible and suitable for soldering.
can be used for interconnect wiring.
has thicker insulation than interconnect wire.
In the wiring code shown, what does the number 6 (4th number from the left) represent? 1EF6B22 NMS V.
Cable number.
Circuit function.
Cable size.
An aluminium oxide layer on a conductor will do what when the temperature is increased?.
Remain the same.
Become thicker.
Become thinner.
What is a coaxial cable?.
A single conductor.
Two or more conductors.
A twisted pair of conductors.
'X' on an electrical cable indicates.
emergency power.
AC power.
control system.
What must you be careful with a hot stamped cable?.
Corrosion.
Peeling of the insulation.
Wet arc tracking.
What is the effect of aluminium oxide on aluminium electrical cable?
Insulates.
Reduces resistance.
Provides strength.
What amperage is an 18 swg cable?
1 amp.
10 amp.
5 amp.
A co-axial cable is better than a normal cable because.
there is an electrostatic field around it which helps to reduce the electromagnetic field.
weight for weight it can carry more signal.
it has less resistance.
