Deck 1: Pattern Making and Cupola Furnace Melting Process

Question 1

A pattern is generally made up of how many pieces?

A)1
B)2-3
C)4-5
D)6

Answer 1

2-3

Question 2

How does pattern vary in size with casting?

A)pattern is larger in size
B)casting is larger in size
C)both have same size
D)size depends on other factors

Answer 2

pattern is larger in size

Question 3

A pattern carries which allowance for internal and external surfaces?

A)shrinkage allowance
B)machining allowance
C)distortion allowance
D)draft allowance

Answer 3

draft allowance

Question 4

What is draft allowance also known as?

A)shake allowance
B)contraction allowance
C)taper allowance
D)rapping allowance

Question 5

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

A)solidifying contraction
B)machining method
C)shape and size of casting
D)casting method

Question 6

How much does the distortion allowance vary?

A)1mm to 10mm
B)2mm to 20mm
C)1mm to 15mm
D)2mm to 15mm

Question 7

Ferrous metals need more allowance than non-ferrous metals.

Question 8

A pattern is shaken by striking it with a wooden piece. A negative allowance is provided for this. Which allowance is it?

A)machining allowance
B)rapping allowance
C)distortion allowance
D)contraction allowance

Question 9

The following figure depicts which allowance?

A)machining allowance
B)shrinkage allowance
C)draft allowance
D)shake allowance

Question 10

Which of the following is not used for the formation of the molding sand?

A)silica sand
B)binders
C)additives
D)coal

Question 11

The is responsible for the impact strength in the molding sand.

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

Question 12

Molding sand can withstand chemical reactions on it and prove it to be beneficial for the casting formation.

Question 13

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

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

Question 14

Binding property of the sand increases because of the property.

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

Question 15

The adhesiveness and cohesiveness are the same properties of the molding sand.

Question 16

Flow ability increases with increase in the green strength.

Question 17

For melting of cast iron, which of the following furnace is used?

A)rotary furnace
B)cupola furnace
C)pit furnace
D)electric furnace

Question 18

Why is sand bed prepared for melting of metal in Cupola furnace?

A)it provides a refractory bottom
B)it soaks the moisture from the metal
C)it conducts the heat faster and uniformly
D)none of the mentioned

Question 19

What is the function of slag hole in a cupola furnace?

A)to tap the slag generated
B)to generate the slag
C)to allow outflow of gases
D)all of the mentioned

Question 20

Incoming air pressure and quantity in cupola furnace are controlled by which of the following element?

A)tuyeres
B)tapping spout
C)wind box
D)blast pipe

Question 21

Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace?

A)coke
B)methane
C)carbon dioxide
D)limestone

Question 22

Which of the following metal has a melting point of about 1537oC and latent heat of fusion 65.0 cal/g?

A)nickel
B)copper
C)zinc
D)iron

Question 23

What is hearth in a furnace?

A)the electrodes are often called hearth
B)the walls of the furnace
C)the bowl shaped bottom of the furnace
D)the dome shaped roof of the furnace

Question 24

Why are flux added to the charge ( parent metal to be melted) during melting of a metal?

A)to increase carbon content
B)to increase refractoriness
C)to add specific oxides
D)to remove specific oxides

Question 25

Which of the following is/are the advantage(s) of an Induction Furnace?

A)higher yield
B)cleaner melting
C)compact installation
D)all of the mentioned