Question 1

eg. What is the capital of france?

Accepted Answer

eg. Paris

Answer

London

Answer

Rome

Answer

Amsterdam

Question 2

What is Powder Metallurgy (PM)?

Accepted Answer

Compaction of metal powders into shapes, then sintered to form a solid piece

Answer

Forging metals with a hammer

Answer

Welding metal sheets together

Answer

Melting metals and pouring them into molds

Question 3

Which of the following is NOT a commonly used metal in powder metallurgy?

Accepted Answer

Lead

Answer

Iron

Answer

Copper

Answer

Aluminum

Question 4

What is a primary advantage of powder metallurgy?

Accepted Answer

Ability to produce parts to net dimensions

Answer

It requires no equipment

Answer

It requires no heat

Answer

It eliminates porosity

Question 5

Which process involves breaking up a molten metal stream by jets of gas or water?

Accepted Answer

Atomization

Answer

Casting

Answer

Forging

Answer

Welding

Question 6

What is the result of the reduction method in powder production?

Accepted Answer

Spongy and porous powders

Answer

Large metal sheets

Answer

Liquid metal droplets

Answer

Solid, non-porous blocks

Question 7

Which process involves crushing and grinding metals to make powders?

Accepted Answer

Comminution

Answer

Sintering

Answer

Forging

Answer

Extrusion

Question 8

Why is blending metal powders important?

Accepted Answer

To mix different metals for uniformity and improve flow and green strength

Answer

To separate the powders

Answer

To melt the powders completely

Answer

To turn powders into liquids

Question 9

What is a 'green compact' in powder metallurgy?

Accepted Answer

A pressed, but unsintered, powder part

Answer

A melted metal piece

Answer

A fully finished metal part

Answer

A metal ingot

Question 10

How does increasing compaction pressure affect powder density?

Accepted Answer

It increases density by plastic deformation at interfaces

Answer

It decreases density

Answer

It turns powder into gas

Answer

It melts the powder

Question 11

What is Powder-Injection Molding?

Accepted Answer

Fine metal powders blended with a binder, then injected into a mold

Answer

Hammering metal sheets

Answer

Directly pouring molten metal into a mold

Answer

Gluing metal powders together

Question 12

At what temperature range is powder-injection molding typically performed?

Accepted Answer

135°C to 200°C

Answer

1000°C to 1200°C

Answer

500°C to 800°C

Answer

20°C to 50°C

Question 13

Which process compacts metal powder into a continuous strip?

Accepted Answer

Powder Rolling

Answer

Die casting

Answer

Sintering

Answer

Welding

Question 14

What is Spray Deposition in powder metallurgy?

Accepted Answer

Spraying molten metal onto a mold where it solidifies

Answer

Cutting metal sheets

Answer

Welding metal powders

Answer

Dipping metal into a mold

Question 15

What happens during sintering?

Accepted Answer

Green compacts are heated below melting point to bond particles

Answer

Powders are frozen

Answer

Metal is melted completely

Answer

Powders are mixed with water

Question 16

What is one unavoidable issue in powder metallurgy products?

Accepted Answer

Porosity

Answer

Explosive reactions

Answer

High electrical conductivity

Answer

Complete melting

Question 17

Why does porosity remain in PM products?

Accepted Answer

Voids remain after compaction and gases evolve during sintering

Answer

The metal melts completely

Answer

The powder turns into liquid

Answer

Too much lubricant is added

Question 18

At what density percentage do interconnected pores start appearing in PM products?

Accepted Answer

Less than 80% of theoretical density

Answer

100% of theoretical density

Answer

95% of theoretical density

Answer

50% of theoretical density

Question 19

What kind of part geometries should be avoided in PM designs?

Accepted Answer

Sharp radii and reentry corners

Answer

Round holes

Answer

Cylindrical shapes

Answer

Smooth curves and flat surfaces

Question 20

Why must threads and transverse holes be produced separately in PM parts?

Accepted Answer

They cannot be formed during the pressing and sintering process

Answer

They are too weak

Answer

They melt during sintering

Answer

They form naturally

Question 21

Which of these is NOT a method of powder production?

Accepted Answer

Welding

Answer

Comminution

Answer

Reduction

Answer

Atomization

Question 22

Which equipment is used for mechanical comminution?

Accepted Answer

Ball mill, hammer mill, and roll crusher

Answer

Furnace

Answer

Injection mold

Answer

Spray gun

Question 23

What is the purpose of adding lubricants during blending of metal powders?

Accepted Answer

To improve flow characteristics

Answer

To melt the powders

Answer

To add porosity

Answer

To corrode the powders

Question 24

What is the purpose of adding binders during blending?

Accepted Answer

To develop sufficient green strength

Answer

To decrease the powder density

Answer

To improve electrical conductivity

Answer

To produce large metal sheets

Question 25

Which process uses a rotating consumable electrode for atomization?

Accepted Answer

Atomization with a rotating consumable electrode

Answer

Powder rolling

Answer

Comminution

Answer

Die casting

Question 26

Which atomization method uses a spinning disk or cup?

Accepted Answer

Centrifugal atomization

Answer

Hammer forging

Answer

Welding

Answer

Ball milling

Question 27

What type of mixer is suitable for blending abrasive metal powders?

Accepted Answer

Tumbling or rotating enclosed mixers

Answer

Water-based blenders

Answer

Magnetic stirrers

Answer

High-speed blenders with aggressive agitators

Question 28

Which material is often used for making powder metallurgy parts in automotive engines?

Accepted Answer

Iron

Answer

Wood

Answer

Plastic

Answer

Glass

Question 29

Which process is similar to die casting but for fine metal powders blended with a binder?

Accepted Answer

Powder-injection molding

Answer

Spray deposition

Answer

Cold rolling

Answer

Forging

Question 30

Which of these would likely be a poor design feature for a PM part?

Accepted Answer

Sharp inside corners

Answer

Smooth curves

Answer

Flat surfaces

Answer

Uniform wall thickness

Question 31

Which factor has the largest effect on the strength of a green compact?

Accepted Answer

Compaction pressure

Answer

Polishing

Answer

Cooling speed

Answer

Painting

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