Casting, Forming & Welding I MCQ


In pressure die castings, production rate is low.

A) True B) False
Answer & Explanation Answer: B) False

Explanation: In pressure die castings, a very high production rate is possible, as it becomes economical for large quantities.

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Up to what thickness can the sections be casted?

A) 0.3mm B) 0.4mm
C) 0.5mm D) 0.6mm
Answer & Explanation Answer: C) 0.5mm

Explanation: In pressure die casting, it is one of the advantages of this process, that castings which have very small sections too can be casted by it. The section of the casts can be manufactured up to 0.5mm.

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Up to what tolerances can pressure die casting be possible?

A) ? 0.067mm B) ? 0.076mm
C) ? 0.025mm D) ? 0.052mm
Answer & Explanation Answer: B) ? 0.076mm

Explanation: Pressure die casting, overall is a very useful process. It is handy when small parts are to be produced. Up to ? 0.076mm of close tolerance, in pressure die casting, making small parts becomes possible.

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Which of the following is not counted among the limitations of pressure die casting?

A) Only small parts can be produced B) High cost
C) Low scale production D) Castings are porous
Answer & Explanation Answer: C) Low scale production

Explanation: Pressure die casting is used for mass production, the reason being, that equipment needed in pressure die casting is not available at low costs. The dies used in this process too are very expensive.

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Alloys of which of the following metal is not used for hot chamber die casting?

A) Tin B) Lead
C) Zinc D) Iron
Answer & Explanation Answer: D) Iron

Explanation: Among the following metals, the alloys which are made up of iron are least manufactured using hot chamber die cast method, while all others are widely used.

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According to Bernoulli?s theorem, energies at two points in a flowing liquid are equal.

A) True B) False
Answer & Explanation Answer: A) True

Explanation: According to Bernoulli?s theorem, the energies at two points in a flowing liquid, in a system having equal or unequal cross section areas, at same or different heights, are equal.

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What is the shape of the sprue?

A) Cuboidal B) Cubicle
C) Trapezoidal D) Spherical
Answer & Explanation Answer: C) Trapezoidal

Explanation: The sprue is essentially tapered, giving it a trapezoidal look. It needs to be tapered, because of the inverse relation between area and velocity.

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In any flow through a system, if the area of cross section in which the metal is flowing, decreases, how will it affect the velocity?

A) Increases B) Decreases
C) No affect D) Quantities not related
Answer & Explanation Answer: A) Increases

Explanation: If the area of cross section of the system through which the molten metal is flowing, gets a decrease, then the velocity of the flow would increase, as the two hold an inverse relation.

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