Quiz 3 (Manufacturing Processes)

Front 1

True or False?

The solidification time is a function of the volume of casting and its surface area.

Back 1

TRUE

Front 2

True or False?

Shrinkage is mainly due to thermal expansion of the metals.

Back 2

TRUE

Front 3

The defect from the figure is....

[Look at the quiz]

Back 3

Blow

Front 4

True or False?

Solidification of pure metals take place at a variable temperature.

Back 4

FALSE

Front 5

Which materials expend during solidification?

Back 5

Cast iron

Front 6

True or False?

The traditional method of casting metals is sand mold.

Back 6

TRUE

Front 7

Cores are:

Back 7

Insets made from sand

Front 8

Ceramic mold are used due to:

Back 8

High Temperature resistance

Front 9

True or False?

Die casting process is a permanent-mold casting system.

Back 9

TRUE

Front 10

Centrifugal casting is used for parts with any shape placed at a certain distance from the axis of rotation.

Back 10

FALSE

Front 11

In permanent-mold casting, die and equipment are relatively high. But the processes are economical because:

Back 11

Large production runs;

Low scrap;

High accuracy

Front 12

True or False?

Sharp corners, angles and fillets should be avoided in designing cast parts.

Back 12

TRUE

Front 13

The figure represents:

[Look at the quiz!]

Back 13

Flat-rolling process

Front 14

True or False?

Changes in the grain structure (from large grains to small grains) improve strength and ductility.

Back 14

TRUE

Front 15

Small diameter rolls or small thickness reduction-per-pas tend to deform the metal plastically more at its surface than in the balk. This situation result in:

Back 15

Compressive residual stress on the surface;

Tensile stress in the bulk.

Front 16

True or False?

Thread rolling is a hot forming process by which straight or tapered threads are form on round rods or wire by passing them between dies.

Back 16

FALSE

Front 17

The figure represents:

[Look at the quiz]:

Back 17

Closed-die forging process

Front 18

Piercing is a process of indenting the surface of a workpiece with a punch to produce a cavity or an impression. The process is with:

Back 18

Not Breaking through

Front 19

True or False?

Forgeability is defined as the capability of a material to undergo deformation without cracking.

Back 19

TRUE

Front 20

True or False?

The cost per piece in forging process increases with the number of parts.

Back 20

FALSE

Front 21

True or False?

The extrusion process can be cold or hot.

Back 21

TRUE

Front 22

True or False?

The force in cold extrusion is proportional to cross-sectional area, the average flow stress and the true strain.

Back 22

TRUE

Front 23

Surface cracking and tearing in cold forging are caused by:

Back 23

High temperature;

High friction;

High speed

Front 24

True or False?

In drawing, the cross-section of a long rod or wire typically is reduced or changed by pulling it through a draw die.

Back 24

TRUE

Front 25

For high quality drawn products the main factors are:

Back 25

Die design;

Reduction in cross-sectional area per pas;

Selection of die materials;

Selection of lubricants