Mechanical Engineering quiz
1) Which of the following statements are correct (several are possible)?
A brittle material can be used in any condition.
A brittle material must not be used at all.
A brittle material is not suitable when fatigue loads are involved.
A brittle material is suitable for low temperature applications.
A brittle material is not suitable for low temperature applications.
2) We have two springs each of them with a rigidity K. Once in series the resulting rigidity is
Larger than the one of each single spring.
Smaller than the one of each single spring.
The same as the one of a single spring.
3) We have two springs each of them with a rigidity K. Once in parallel the resulting rigidity is
Larger than the one of each single spring.
Smaller than the one of each single spring.
The same as the one of a single spring.
4) Which of the following statements are correct (more answers are possible). The modulus of elasticity (Young modulus) of one material
Gives the ratio between stress and strain in a mechanical element made of this material.
Is the difference between stress and strain in a mechanical element made of this material.
Gives indications about the rigidity of the material.
Can be expressed in MN/m^2 or MPa.
5) When sizing a cylindrical vessel, a verification of the resistance to buckling has to be carried out
When the pressure inside the cylinder is larger than the one outside it.
Never. The axial symmetry in a cylinder stops buckling.
When the pressure inside the cylinder is lower than the one outside it.
In all cases. Pressure is always a critical load.
6) For the structures working in presence of humidity. If the parts are made of different metals and plastic.
It is important to paint or oil all the parts to avoid rust.
Nothing has to be done. Humidity is a good lubricant.
It is important to choose carefully the metallic grades to avoid electrolytic corrosion.
7) Which of the following alloyscan be welded(more answers are possible)?
Construction steel S255
Tungsten-Nickel-Iron alloys
Austenitic stainless steel AISI 304
Aluminium alloy EN AW 6082
Lead
8) To connect a piece of austenitic stainless steel with a piece of copper which of these technique can be uses(more answers are possible)?
Bolting
TIG welding
MIG welding
Brazing
Gluing
9) Which of the following materials has the lowest thermal conductivity?
High purity aluminium
Austenitic stainless steel
High purity copper
10) Which of the following materials has the highest electrical resistivity?
High purity aluminium
Austenitic stainless steel
High purity copper
11) Are the properties of questions 9) and 10) related?
Yes
No
12) The HAZ (heat affected zone) is:
The volume of a mechanical component that had a thermal treatment.
The volume of material at the two sides of a weld.
The volume of material close to a heat sink.
The hottest part of a heat exchanger.
13) A piece of aluminium alloy is usually anodized (more answers are possible)
Before final machining
After final machining
In order to increase the surface hardness despite reducing the corrosion resistance
In order to increase its corrosion resistance
In order to stress relieve it and reduce the hardness
14) The tensile strength of a weld of an AISI 316 LN stainless steel has to be checked. The weld is a full penetration butt weld in plate; the welded plates are 5 mm thick. The base metal has an Ultimate Tensile Strength of 600 MPa. You have to test a plate-type specimen of a width of 10 mm in the gauge length and 18 mm in the heads. Which load cell would you select for the test(more answers are possible)?
29 kN
50 kN
54 kN
100 kN
A load cell allowing to reach 600 MPa
15) A metallic beam blocked at both extremities into two parallel walls is subjected to an increase of temperature ΔT. Neglecting the dead weight of the beam, which of the following statements are correct:
Nothing happens.
The beam becomes a compressed element.
In the beam there are compression and shear stresses.
The beam could buckle.
The beam becomes an element under traction.
16) In a cylindrical beam under a given torsion the shear stress is maximum:
In the centre of any cross section.
At the surface of the cylinder, (maximum radius of any cross section).
It is constant in the whole cross section and along the beam.
In the centre of the cross section in the middle of the beam.
At 2/3 of the radius of any cross section.
17) In a railway Bridge made of a single S235 construction steel beam supported at the centre and at the extremities, the bending moment in the beam is maximum
In the centre.
At the supports at the extremities of the beam.
In between two supports (centre and extremity).
I cannot answer. It depends how the supports are made.
18) Which of those materials can be machined in a lathe?
Stainless steel
Aluminium
Graphite
PVC
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