Test: Extrusion, Drawing & Powder Metallurgy - 1 - Mechanical Engineering MCQ

Both A and R are true and R is the correct explanation of A

 Both A and R arc true but R is NOT the correct explanation of A

A is true hut R is false

A is false but R is true

flow rate of powder  

green strength of compact

apparent density of compact  

compressibility of powder 

uniform solid sections

uniform hollow sections

 varying solid and hollow sections.

uniform solid and hollow sections

In extrusion process, thicker walls can be obtained by increasing the forming pressure

Extrusion is an ideal process for obtaining rods from metal having poor density

As compared to roll forming, extruding speed is high

Impact extrusion is quite similar to Hooker's process including the flow of metal being in thesame direction

increase the toughness of the component                                                

increase the density of the component

facilitate bonding of non-metallic particles

facilitate machining of the part 

Both A and R are true and R is the correct explanation of A

 Both A and R arc true but R is NOT the correct explanation of A

A is true hut R is false

A is false but R is true 

1 only

1 and 2

2 and 3

3 only

Zirconium-Tungsten (35% -65%)  

Tungsten carbide-Cobalt (90% - 10%)

Aluminium oxide- Silica (70% - 30%)  

Nickel-Chromium- Tungsten (30% - 15% - 55%) 

extrusion ratio

material of the die

type of extrusion process

working temperature

does not use a lubricant

uses solid powdery lubricant.

uses thick paste lubricant

uses thin fluid lubricant.

Infiltration  

Impregnation

Plating  

Graphitization 

5.44 MN

2.72 MN

1.36 MN

0.36 MN

a

b

c

d

2, 3 and 4  

1, 2 and 3  

1, 3 and 4  

1, 2 and 4 

a

b

c

d

Ductility

Compressive strength

Brittleness

Tensile strength

Extrusion is used for the manufacture of seamless tubes.

Extrusion is used for reducing the diameter of round bars and tubes by rotating dieswhich open and close rapidly on the work?

Extrusion is used to improve fatigue resistance of the metal by setting up compressivestresses on its surface

Extrusion comprises pressing the metal inside a chamber to force it out by high pressurethrough an orifice which is shaped to provide the desired from of the finished part.

infiltration  

impregnation  

plating          

heat treatment 

Both A and R are true and R is the correct explanation of A 

 Both A and R arc true but R is NOT the correct explanation of A

A is true hut R is false

A is false but R is true

Compressive

Hydrostatic stress 

Shear

Tensile