B.E. (Production) PLASTIC ENGINEERING (2008 Pattern) (Sem. – I) (Elective – I)
Time :3 Hours] [Max. Marks :100
Instructions to the candidates:-
1) Answer any three questions from each section.
2) Answers to the two sections should be written in separate books.
3) Neat diagrams must be drawn wherever necessary.
4) Assume suitable data, if necessary.
SECTION – I Unit – I
Q1) a) Discuss commonly used thermoplastic materials. 
b) Discuss commonly used additives in plastic. 
Q2) a) Explain the types of polymerization. 
b) Discuss classification of Plastic. 
Unit – II
Q3) a) Explain injection moulding cycle. 
b) Discuss injection moulding consideration. 
Q4) a) Explain cooling methods used in injection moulding and methods of ejection. 
b) Explain importance of register ring, sprue bush, cavity & core inserts.
Unit – III
Q5) a) Explain extruders with suitable sketches. 
b) Discuss special features of extrusion dies. 
Q6) a) Discuss extrusion costing & lamination with suitable sketches. 
b) Discuss extrusion problems & extruder performance. 
SECTION – II
Unit – IV
Q7) a) Discuss types of blow moulding. 
b) Explain rotary injection blow moulding. 
Q8) a) Compare injection & extrusion blow moulding. 
b) Discuss basic design considerations in blow moulding. 
Unit – V
Q9) a) Explain Thermoforming processes with suitable sketches. 
b) Explain vaccum forming with suitable sketches. 
Q10) a) Discuss process factors in thermoforming. 
b) Discuss problems in thermoforming. 
Unit – VI
Q11) a) Explain filling, tumbling, ashing of thermosetting & thermoplastic. 
b) Discuss buffing & polishing of thermosetting & thermoplastic. 
Q12) a) Discuss machining of plastic. 
b) Discuss guidelines for tool geometry.