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WorksheetsQuiz despre asamblări filetate
Total questions: 46
Worksheet time: 23mins
What does the term "asamblări filetate" refer to?
Connections made using adhesives
Connections made using threaded elements
Connections made using welding
Connections made using rivets
What is the main advantage of "asamblări filetate"?
They are permanent and cannot be undone
They allow for detachable connections without deterioration
They require no tools for assembly
They are resistant to vibrations without additional components
Which of the following is NOT an example of elements used in "asamblări filetate"?
Șuruburi
Piulițe
Șaibe
Sudură
What is one disadvantage of "asamblări filetate"?
They are difficult to assemble
They require specialized tools for assembly
They can loosen due to vibrations
They are not suitable for large-scale applications
Which of the following is a benefit of "asamblări filetate"?
High cost
Limited size and material options
Controlled tightening (cuplu de strângere)
Permanent assembly
What type of surfaces are used in "asamblări filetate"?
Smooth surfaces
Rough surfaces
Helical surfaces (filete)
Flat surfaces
What is the most common type of screw used for joining two or more pieces?
Self-tapping screws
Screws with threaded holes
Threaded rods with nuts
Screws with small heads
Which material is most commonly used for threaded assemblies due to its high resistance and low cost?
Stainless steel
Aluminum
Carbon steel/alloy steel
Zinc-coated steel
What is the main disadvantage of carbon steel if it is not treated or coated?
It becomes brittle
It rusts
It loses its mechanical resistance
It becomes too heavy
Which stainless steel grade is more resistant to marine environments?
A2 (304)
A4 (316)
A8 (410)
A6 (310)
What is the main advantage of aluminum in threaded assemblies?
High mechanical resistance
Lightweight
Corrosion resistance
High cost
What is the disadvantage of aluminum in fasteners compared to steel?
It is heavier
It has reduced mechanical resistance
It is prone to corrosion
It is more expensive
What is the purpose of zinc coatings on carbon steel?
To increase mechanical resistance
To protect against corrosion
To reduce weight
To improve electrical conductivity
Which material is known for its excellent strength-to-weight ratio and is resistant to corrosion, even in aggressive chemical environments?
Aluminum
Steel
Titanium
Copper
What is a disadvantage of using titanium in applications?
Low resistance to corrosion
High cost
Poor strength-to-weight ratio
Limited applications
Which material is often used for decorative elements or applications in marine environments due to its high resistance to corrosion?
Silicon-bronze
Aluminum
Steel
Titanium
What type of material is recommended for applications requiring high tensile strength and resistance to breaking forces?
Copper
Alloy steel or titanium
Aluminum
Silicon-bronze
Which materials are suitable for use in corrosive environments such as those with salt or humidity?
Aluminum and copper
Steel and silicon-bronze
Inox, titanium, and bronze
Alloy steel and niobium
What are niobium and tantalum primarily used for?
Decorative applications
High-temperature and aggressive chemical environments
Marine applications
Lightweight structures
Threaded assemblies are:
Non-detachable
Detachable
Glued
Welded
The most commonly used element in a threaded assembly is:
Screw
Nut
Welding
Glue
Care dintre următoarele este un element de fixare?
Cuiul
Știftul
Șurubul
Nitul
Avantajul principal al asamblărilor filetate este:
Cost foarte mare
Pot fi demontate și remontate
Pot fi demontate și remontate
Nu pot suporta sarcini mari
Filetul metric se notează cu litera:
W
M
T
R
O piuliță autoblocantă se folosește pentru:
A crește lungimea filetului
A preveni desfacerea din vibrații
A reduce frecarea
A mări pasul filetului
Clasa de rezistență 8.8 la un șurub înseamnă:
Rezistență foarte scăzută
Rezistență medie
Oțel de înaltă rezistență
Aluminiu pur
Un șurub M10 are:
diametrul nominal de 10 mm
lungimea de 10 mm
pasul filetului de 10 mm
rezistența de 10 N
What is the diameter of the thread with a size of 10 mm?
The external diameter of the thread is 10 mm
The length is 10 mm
The thread pitch is 10 mm
The internal diameter is 10 mm
When is a "screw-threaded hole" assembly recommended?
When the part is very thin
When the part is thick enough for threading
When disassembly is not desired
When plastic materials are used
What is the purpose of a Grover (elastic) washer?
Sealing fluids
Surface protection
Preventing loosening
Increasing the thread pitch
Which material offers the best resistance to corrosion in marine environments?
Carbon steel
Raw aluminum
Stainless steel A4 (316)
Unalloyed bronze
Select the materials frequently used for screws:
Carbon steel
Wood
Aluminum
Titanium
What is one surface treatment used to prevent corrosion?
Zinc coating
Painting
Nitriding
Phosphating
What is the role of a washer in an assembly?
To prevent loosening of screws
To increase the diameter of screws
To provide a decorative finish
To reduce the weight of the assembly
What is the difference between a hexagonal head screw and a cylindrical head screw?
Hexagonal head screws are used for decorative purposes, while cylindrical head screws are used for structural purposes.
Hexagonal head screws are tightened using a wrench, while cylindrical head screws are tightened using an Allen key.
Hexagonal head screws are made of steel, while cylindrical head screws are made of aluminum.
Hexagonal head screws are used in wet environments, while cylindrical head screws are used in dry environments.
What type of material should be chosen for screws in a humid environment (e.g., saltwater)?
Stainless steel
Aluminum
Plastic
Copper
What type of anti-loosening element is recommended for assemblies subject to vibrations (e.g., motors)?
Locking washers
Thread-locking adhesive
Spring washers
Rubber gaskets
How can you identify the diameter of the thread on an M12 screw?
Measure the external diameter of the screw
Measure the internal diameter of the screw
Refer to the screw's packaging
Use a ruler to measure the length of the screw
What is the distance between two consecutive threads of a screw called?
Thread pitch
Thread diameter
Thread length
Thread depth
What is the role of a washer in mechanical assemblies?
To increase the thread pitch
To distribute pressure evenly on the surface
To reduce the diameter of the screw
To tighten the screw further
Which type of screw is ideal for tight spaces and fine mechanisms?
Hexagonal head screw
Cylindrical head screw (imbus)
Flat head screw
Round head screw
What material is recommended for screws in wet and salty environments?
Carbon steel
Aluminum
Stainless steel (A4) or titanium
Zinc-coated steel
Which component is used to prevent loosening in vibrating environments?
Thread pitch
Grover washer
Hexagonal screw
Cylindrical screw
What is the diameter of the external thread of an M12 screw?
10 mm
12 mm
14 mm
16 mm
Which type of screw head is tightened using a fixed or tubular wrench?
Hexagonal head screw
Cylindrical head screw
Flat head screw
Round head screw
What adhesive is commonly used to secure screws in place?
Nyloc
Loctite
Grover washer
Zinc coating
