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Manufacturing Processes I Question Paper

Manufacturing Processes I

Course:Bachelor Of Science In Manufacturing Engineering And Technology

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN MANUFACTURING ENGINEERING

SET 412:
MANUFACTURING PROCESSES I

DATE: Monday, 28th December, 2009

TIME: 11.00 a.m. – 1.00 p.m.
------------------------------------------------------------------------------------------------------------
INSTRUCTIONS:
ALL questions carry equal marks. Answer any THREE questions.
1.
a)
How does the size and shape of sand grains relate to moulding sand
properties?
(10
marks)

b)
Describe, with the aid of diagrams, the distribution of sand density after
compaction by jolting; squeezing; and jolt-squeeze combination.

(6 marks)

c)
Distinguish between primary and secondary crystallization. (3 marks)

d)
List two methods of cleaning castings

(2 marks)

2.
a)
What should the gating system be designed to accomplish? (7 marks)
b)
Describe, with aid of a diagram, the nucleation of pure metal.
(5 marks)

c)
Give the advantages of shell moulding over green sand moulding.

(6 marks)

d)
Foundry sand is normally reclaimed. Why?

(2 marks)

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3.
a)
Discuss the effects of an improper design of a gating system.

(10 marks)
b)
Describe the process of making moulds using plaster mould process.
(5 marks)

c)
What are the disadvantages of using a cupola to melt iron? (5 marks)

4.
a)
What are the factors that determine the choice of a furnace? (5 marks)

b)
With examples, outline the purposes of melt treatments.
(5 marks)
c)
Describe the process of annealing. What is accomplished by the process?
(5 marks)

d)
Distinguish between wet and dry reclamation.

(5 marks)

5.
a)
Discuss briefly how you would make a mould using the lost wax process.

(8 marks)

b)
Outline the advantages of die casting.

(5 marks)

c)
What are the possible causes of blow holes and gas holes? How can they
be
prevented?
(7
marks)

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Manufacturing Processes I Question Paper

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