ELEMENTOS DE MÁQUINA

Open Ended

Describe the sequence of steps involved in manual riveting using flat countersunk head rivets.

Open Ended

Describe a common defect caused by poor preparation of plates before riveting and explain its impact on the joint.

Multiple Choice

Which of the following is NOT typically considered a fastening element in mechanical engineering?

• Rivet

• Washer

• Nut

• Gear

Open Ended

Why is it important for a mechanical professional to understand the different types of fastening elements used in machines?

Open Ended

Explain why it is important to choose the correct type of fastening element when designing a mechanical assembly.

Multiple Choice

Which of the following is an example of a permanent fastening element?

• Screw

• Nut

• Rivet

• Washer

Fill in the Blank

A ___ is used to join articulated parts, allowing one of the parts to rotate.

Multiple Select

Which of the following are characteristics of a cotter pin (contrapino ou cupilha)?

• It is made of wire shaped like a half-cylinder

• It is used to prevent the removal of pins or nuts during vibrations

• It is used for permanent fastening of parts

• It has two unequal legs

Multiple Choice

What does the notation '2 x d' mean for a rivet with a large round head?

• The head diameter is twice the body diameter

• The body diameter is twice the head diameter

• The length is twice the diameter

• The head height is twice the diameter

Open Ended

Describe a real-world situation where using a rivet would be more appropriate than using welding for permanent joining of metal parts.

Multiple Choice

Which type of rivet is used in joints that do not allow protrusions?

• Cabeça escareada chata estreita

• Cabeça redonda estreita

• Cabeça tipo panela

• Cabeça cilíndrica

Multiple Select

Which of the following are special types of rivets?

• Tube rivet

• Explosive rivet

• Semi-tube rivet

• Threaded rivet

Multiple Choice

What is the main function of the tool called 'estampo' in the riveting process?

• To cut metal sheets

• To form the second head of the rivet

• To heat the rivet

• To measure the pressure applied

Open Ended

Compare the advantages and disadvantages of using pneumatic/hydraulic riveting machines versus manual riveting systems.

Fill in the Blank

The symbol used to indicate the necessary excess material for forming the second head of a rivet is ___.

Multiple Select

Which of the following statements about hot and cold riveting is/are correct?

• Hot riveting is used for rivets with a diameter greater than 6.35 mm.

• Cold riveting is suitable for steel and aluminum rivets.

• Hot riveting requires the use of a heat source such as a furnace or torch.

• Cold riveting is only possible with manual tools.

Open Ended

Describe the manual process for forming the second head of a rivet during riveting. What tools are involved and what is their function?

Multiple Choice

What is the purpose of the contra-estampo in the riveting process?

• To heat the rivet

• To hold the rivet in place while forming the head

• To cut the rivet to the correct length

• To compress the sheets to be riveted

Multiple Choice

What are the main types of riveting according to the width of the plates and the force they will be subjected to?

• Riveting with welding, simple riveting, double riveting

• Cover riveting, simple cover riveting, double cover riveting

• Spot welding, seam welding, arc welding

• Single riveting, double riveting, triple riveting

Multiple Choice

Which factors must be considered when determining the distribution of rivets in a joint?

• Only the length of the plate

• The length of the plate, distance from the edge to the nearest rivet, rivet diameter, and pitch

• Only the diameter of the rivet

• Only the number of plates

Fill in the Blank

Fill in the blank: The formula for calculating the diameter of the rivet is d = ___ × < S, where < S is the smallest thickness of the plates to be riveted.

Multiple Select

Select all correct statements about the calculation of the useful length of a rivet:

• For round and cylindrical head rivets, use L = 1.5·d + S

• For countersunk head rivets, use L = 1·d + S

• The useful length depends only on the diameter of the rivet

• The sum of the thicknesses of the plates is used in the calculation

Open Ended

How do you think understanding fastening elements can help you in identifying and solving mechanical problems in real-world machines?

Multiple Choice

What are some of the main types of fastening elements used in mechanics, as described in the lesson?

• Rivets, pins, screws, nuts, washers, elastic rings, keys

• Belts, pulleys, gears, chains, springs

• Bearings, shafts, couplings, cams, levers

• Motors, sensors, actuators, controllers