Deck 9: Casting and Moulding Processes and Properties

Question 1

Shrinkage allowance does not depend on which of the following factor?

A)moulding method
B)casting dimension
C)pouring temperature of molten metal
D)amount of finish required

Answer 1

amount of finish required

Question 2

The size of the sand particles in the molding sand is the biggest.

Answer 2

True

Question 3

The_______________is responsible for the impact strength in the molding sand.

A)aggregates
B)refractoriness
C)impurities
D)permeability

Answer 3

aggregates

Question 4

The_______________ property ensures the removal of excess sand in the mould box.

A)adhesiveness
B)cohesiveness
C)green strength
D)compressive strength

Question 5

Binding property of the sand increases because of the_______________ property.

A)cohesiveness
B)collapsibility
C)flow ability
D)permeability

Question 6

Which of the following is the most important property of the molding sand in cores?

A)dry strength
B)green strength
C)collapsibility
D)cohesiveness

Question 7

Electric arc furnaces are most suitable for which of the following type of material?

A)ferrous
B)non-ferrous
C)both ferrous and nonferrous
D)neither ferrous nor nonferrous

Question 8

There is no direct contact of flame and metal in which of the following type of furnace?

A)cupola
B)crucible
C)electric arc
D)induction

Question 9

In an induction furnace, mixing and melting rates are altered by?

A)controlling the temperature ranges only
B)controlling the number of electrodes used only
C)controlling power and frequency of current only
D)all of the mentioned factors

Question 10

The machine used to mix shell mould particles consistently is_______________      

A)mixer
B)cupola furnace
C)mueller
D)mixer & cupola furnace

Question 11

Cores used in PMC are usually made up of?

A)metal
B)collapsable material
C)sand
D)all of the mentioned

Question 12

Hollow casting is the other name of which of the following special casting process?

A)slush casting
B)vacuum die casting
C)precision investment casting
D)squeeze casting

Question 13

Pressure range for low pressure die casting is_______________        

A)0.3-1.5 bars
B)0.5-2 bars
C)2-6 bars
D)up to 8 bars

Question 14

Dry sand cores may be required for the provision of spigot at the end section of the casting.

Question 15

Which of the following parts is provided in between the mould and casing to reduce the vibrations?

A)steel balls
B)metallic roller
C)viscous fluid
D)grease

Question 16

In centrifugal casting, the casting yield is approximately equaled to 100%.

Question 17

It is also possible to make un-symmetric shape of casting in true centrifugal casting by introducing some variations to the mould.

Question 18

Castings made by the centrifugal casting process have negligible porosity.

Question 19

Which of the following types of centrifugal casting process is used for the casting, whose shape of casting is not axi- symmetric?

A)true centrifugal casting
B)semi centrifugal casting
C)centrifuging
D)full centrifugal casting

Question 20

CO₂ moulding is mainly used for the increase in strength and hardness of the moulds and cores.

Question 21

Continuous passing of CO₂ through the mould can decrease the strength of mould and results in a weak mould.

Question 22

Additives can be used for the non-ferrous application to avoid the poor collapsibility of the mould.

Question 23

Sometimes over-gassing can cause the sticking of pattern to the mould in CO₂ moulding.

Question 24

The rotor of a three phase induction motor can never attain synchronous speed.