JNTU
JNTU B.Tech II PRODUCTION TECHNOLOGY Previous Question Paper (December - 2018 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What is draft allowance?
Answer
Draft allowance is the intentional taper provided on the vertical surfaces of a pattern to facilitate its easy and clean withdrawal from the sand mold without damaging the mold cavity walls.
Where core is used?
Answer
A core is used in casting to create internal cavities, hollow sections, or complex shapes within a component that cannot be formed by the pattern alone. It is placed inside the mold cavity before pouring the molten metal.
Differentiate permanent and temporary joints.
Answer
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Which electrode is used in spot welding and why?
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What is HAZ?
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To weld thicker metals, why larger tip radii are used.
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What factors affect on recrystallization temperature?
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Differentiate blanking and piercing operations.
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How a hole is produced in tube drawing?
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What is rotary swaging?
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Part B
What is directional solidification?
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Discuss the principles and application of hot chamber die casting process.
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What are the various types of patterns used?
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How the investment casting process takes place? Discuss its application.
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Find the best welding speed to be used for the welding of 6 mm steel plates with an ambient temperature of 30°C with the welding transformer set at 25 V and current passing at 300 A. The arc efficiency is 0.9 and the possible travel speeds are 6 to 9 mm/sec. The limiting cooling rate for satisfactory performance is 60°C/s at a temperature of 550°C.
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Explain spot, seam and projection and percussion welding.
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What is explosive welding? Explain.
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What are the causes and remedies of welding defects?
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What are the applications of laser welding?
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Differentiate TIG and MIG welding operation.
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Explain recrystallization and grain growth.
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Differentiate Hot working and Cold working metal forming process.
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What are the various operations that can be performed on Hydraulic press.
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What are the forces and power calculations required for bending operation?
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What is Rotary forging?
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Explain the process of tubes getting extruded.
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What is machine forging?
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What are the causes and remedies of forging defect?
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