Molding Processes MCQs : Here you will find MCQ Questions related to "Molding Processes" in Casting, Forming & Welding. These Molding Processes MCQ Questions Will help you to improve your Casting, Forming & Welding knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations.
___________ is a moulding process that involves the use of furan (chemical binders) to bond the moulding sand.
B. Wood saw
Explanation: Nobake is a moulding process that involves the use of furan (chemical binders) to bond the moulding sand.
In Nobake moulding process, the chemical process of hardening of binder starts when ___________
A. The sand is poured into the mixture
B. The sand is taken out of the mixture
C. The mixture is poured into the moulding flask
D. When the molten metal is poured into the cavity
Explanation: A mixture is used to blend the sand with chemical binder. The chemical hardening starts when this sand exits the mixture.
The Nobake mould have a higher strength as compared to other moulds due to _________
A. Its higher moisture content
B. Its lower moisture content
C. The property to withstand higher metallostatic pressures during casting
D. The property to adapt to any volume
Explanation: The Nobake moulding process provides a good strength of mould, hence, it can withstand the metallostatic pressures and can give good dimensional tolerances.
Which type of metals are compatible with mould made though Nobake process?
C. Both A and B
D. None of the above
Explanation: Both ferrous as well as non-ferrous metals are compatible with mould made though Nobake process.
The degree or intensity of ramming _________
A. Increases bulk density
B. Decreases bulk density
C. Does not change bulk density
D. Can increase as well as decrease bulk density
Explanation: The increased degree of ramming results in an increase of bulk density or hardness of sand.
The permeability of green sand decreases with an intensity of ramming done on the sand.
C. Can be true or false
D. Can not say
Explanation: The permeability of green sand decreases with an intensity of ramming done on the sand. Hence, the amount of clay is adjusted to keep permeability in a profitable zone.
Natural moulding sand have which of the following quality(/ies) ?
A. Freely available in abundance
B. Contains clay in a large amount
C. Moisture content range is wider
D. All of the above
Explanation: Natural moulding sand is cheap, easily available and has a proper consistency of moisture and clay. Hence, requires less time for preparation.
RPM is also known as?
A. Silicone moulding
B. Plaster moulding
C. Rough moulding
D. Raisin moulding
Explanation: R.P.M stands for Rubber Plaster Moulding. RPM is also known as plaster moulding, since, use of plaster of paris is done in this process.
The preset mould is ignited to burn off the volatile content in the set gel to a temperature range of?
Explanation: The preset mould is ignited to burn off the volatile content in the set gel to a temperature range of 120°-260°.
The dried plaster moulds have extremely low permeability, about?
A. 1 to 2 AFS.
B. 2 to 3 AFS.
C. 2 to 4 AFS.
D. 1 to 3 AFS.
Explanation: The dried plaster moulds have extremely low permeability, about- 1 to 2 AFS.