Nptel Princeples of casting technology week 2 solution

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1 point

Muller is used for

 Breaking the mold after casting is solidified

 Mixing of sand and ingredients for making mold

 Increasing the permeability of the mold

 Increasing the toughness of the molding sand

1 point

Permeability of the sand refers to the 

 Ability of the sand to allow gases to escape through it 

 Ability of the sand to withstand high temperatures

 Ability of sand to resist chemical reaction at sand metal interface

 Ability of the sand to absorb thermal energy

1 point

Wood seasoning is used to 

 Increase the moisture content in the wood before its use

 Reduce the moisture content in the wood before its use

 Converting the wood into slab

 Improve its surface finish

1 point

Which of the following properties are not required for molding sand?

 High cohesiveness

 High refractoriness

 High coefficient of thermal expansion

 Low permeability

1 point

Which of the following statement is/are true for draft allowance?
1) It is provided to account for the shaking of the pattern horizontally before its removal from mold.
2)  More draft should be provided for hand moulding compared to machine moulding

 Only 1

 Only 2

 Both 1 and 2

 Neither 1 nor 2

1 point

Shatter test is used to check the ability of the molding sand to 

 Crack under compression

 Deform under shock loading

 Fracture under static loading

 Crack under tensile loading

1 point

Bench life of molding sand is defining as the 

 Time during which molding properties of the sand mix is retained for use

 Time during which solidification is completed 

 Time for the sand mix to flow to all portion of molding box

 Ability of the sand grains to stick together in minimum time

1 point

Which of the following pattern material is best suited for use in high-volume casting production?

 Wood

 Metal

 Plaster of Paris

 Wax

1 point

Which of the following option is correct for the green sand?

 It is green in color

  Mold made by green sand is having clay but no moisture

 It contains moisture in the molding sand

 Both a and b is correct

1 point

After the pattern is withdrawn to form the casting cavity, which of the following activity is not suggested?

 Mold cleaning

 Flame heating of mold

 Mold repair

 Ramming of mold

CONCLUSION:-  Principles of Casting Technology. Princeples of casting technology week 2 solution,