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RollNo........................... 'i1

Total No. of Questions: 08] [Total No. of Page~: 02

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Paper ID [PESOl]

(Please fill this Paper ID in OMR Sheet)

1\1. Tech.

METAL CASTING (PREIPE -501)

Time: 03Hours

Instruction to Candidates:

Maximum Marks : 100

1)

2)

Attempt any Five Questions.

All questions carry equal, marks.

Ql) (a) Discuss the different ingredients of moulding sand. Also compare these

ingredients with the ingredients of core sands.

(b) Discuss in brief the influence of clay content and percentage of tempering

water on the strength of a moulding sand.

Q2) (a) Explain how nucleation occurs and grows in the freezing of the ptire

metal.

(b) List and discuss briefly the factor that affects the fluidity of metals.

Q3) (a) Define risers. What are its primary functions? Design the ingate

dimensions for pouring a 20 kg casting in 11 sec, with the runner

having a cross.-section area -of 600 sq.-mm and the two ingates of 25

mm width each. (Assume any missing data).

(b) What.arethe different types of gates? What are the different objectives

that a designed gating system must accomplish?

Q4) (a) Discuss:

(i) External chill. (ii) Internal chill.

'The use of internal" chill. is more" suitable than external one'. Explain.

(b) Discuss all the formulas used to calculate the gating system dimensions.

(c) Give a short review about the directional so1idification process. Discuss

how the directional solidification can be controlled.