Production Process - 1 - May 2014

Mechanical Engineering (Semester 3)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) Explain the various casting defects with their causes and remedies.(10 marks) 1 (b) Explain press forging? Discuss its advantages over hammer forging.(5 marks) 1 (c) Differentiate soldering and brazing.(5 marks) 2 (a) A cylindrical riser is to be designed for a sad casting mould. The size of steel casting, is 7.5 cm × 12.5cm × 2cm. The previous operation have indicated that the total soliditication time for casting is 96 second. The cylindrical riser have (d/n)=1. find the size of riser so that the total soliditication time is 120 seconds.(10 marks) 2 (b) Discuss resistance welding process with its applications.(5 marks) 2 (c) Differentiate open die forging and closed die forging.(5 marks) 3 (a) Discuss the various defects in rolled parts.(10 marks) 3 (b) Discuss riveted joints state their advantages over other joints.(5 marks) 3 (c) Explain submerged are welding with its applications.(5 marks) 4 (a) Explain the stepwise procedure of powder metallurgy in detail.(10 marks) 4 (b) Explain the Rotational moulding with its advantages and applications.(5 marks) 4 (c) Explain die penetrant testing method of NDT.(5 marks) 5 (a) Explain the screw type injection moulding with neat sketch. Discuss its advantages, limitations and applications.(10 marks) 5 (b) What is powder metallurgy ? Discuss its advantages, applications and limitations.(5 marks) 5 (c) Explain with neat sketches different types of flames generated in gas welding?(5 marks)

Write short note on (any four) -

6 (a) Pattern materials(5 marks) 6 (b) Welding defects(5 marks) 6 (c) Ultrasonic testing(5 marks) 6 (d) CO₂ Welding(5 marks) 6 (e) Thread Rolling(5 marks)