# CIPET Old DPT / DPMT 2012 Question Paper

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CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLOGY
HEAD OFFICE : GUINDY, CHENNAI – 600 032.
SIXTH SEMESTER EXAMINATION – JUNE 2012
Duration : 3 Hours
Max. Marks: 60
Course : DPMT/PD–PMT
Date: 26.06.2012
Subject : Plastics Mould Design Theory - II
Time : 10.00 a.m. to 01.00 p.m.

PART – A
Answer all questions 10 x 1 = 10

1. Compression Mould used for Thermoplastics material - say true or false.
2. Cooling medium for transfer mould is ___________________________.
3. Wire coating die used in gas injection mould - say true or false.
4. We take ________ watts /Kg for calculation of heat in compression mould imperially.
5. Convergent section angle is _______________.
30º - 50º b)  20º - 60º c)  10º - 30º d)  15º - 45º
6. In thermosetting moulds normally cartridge heaters are used - say true or false.
7. In general, the runner wastage in hot runner mould is ___________________.
minimum b)  maximum c)  nil d)  normal
8. Preform is used in _____________________________.
9. Automatic unscrewing mould is used for _____________________________.
internal thread b)  external thread c)  Both a & b   d)  none of these
10. Pot area of Transfer mould is ______________________________________.
a)  more than the projected area b)  less than the projected area
c)  equal to projected area d)  all of these

PART – B
Answer all questions (Max. 40 words)   5 x 2 = 10

1. What are the types of Compression mould ?
2. What are the heat losses and additions taken into account for heat calculation ?
3. What are the ratios used in extrusion process ?
4. Write the formulae for calculating the clamping tonnage for the following.
a)  Compression Mould b)  Blow mould
5. What is outsert moulding ?

PART – C
Answer any six questions (Max. 100 words)  6 x 4 = 24

1. What is the difference between Hot runner mould and Insulated runner mould ?
2. What is pinch-off ?  What are the types ?  Explain any one with simple sketch.
3. What are the types of Hot runner manifolds ?  Draw the sketch for any one.
4. What is Die Gap and Die land ?
6. Define bulk factor ?  How you find LCD in compression mould ?
7. What do you mean by Approach Section and Land section ?

PART – D
Answer any two questions (Max. 300 words)  2 x 8 = 16
Draw the horizontal flash compression mould drawing for a suitable component and mention all the parts with  heat treatment.
2. What are the types of dies for sheet extrusion ?  Explain any one with neat sketch.
3. Write short notes on the following:
a)  Gas injection mould b)  Structural foam mould c)  Stretch blow mould

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#### Duraimani

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