JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year MANUFACTURING PROCESS AND MACHINE TOOLS Previous Question Paper (November/December - 2018 - R16)

List basic steps generally involved in making a casting.

Define weldability. What are the factors that affect weldability of metals?

What factors contribute to spreading in flat rolling?

Explain the phenomenon of Springback and its compensation methods.

Why is glass a good lubricant in hot extrusion?

Why heat treatment is necessary for forging?

List the operations performed on a slotting machine.

Comment about tool materials.

How is grinding ratio defined?

How can sawing be done on milling machine?

Explain with the help of a neat sketch, the process of centrifugal casting.

What is Chvorinov’s rule? Use this rule to compare the solidification times of metal pieces being cast which have the same volume, but different shapes: one is a sphere, one a cube, and the other a cylinder with its height equal to its diameter.

Explain the surface treatment required for resistance welding.

Compare and contrast TIG welding and MIG welding.

Describe the changes in the grain structure of cast or of large-grain wrought metals during hot rolling.

Explain Thread rolling process in detail. List its advantages, disadvantages and the parts to be manufactured.

Describe the cold working processes; coining and spinning

Calculate the maximum punch force needed for a single-stage piercing and blanking operation in which a washer with an external radius of 20 mm and an internal radius of 12 mm is produced from material of thickness 1.5 mm and having shear strength of 430 MPa.

Explain the metal flow pattern in extrusion indicating the dead zones.

Calculate the extrusion force for a round billet 300 mm in diameter, made of stainless steel, and extruded at 10000C to a diameter of 70 mm. If you include friction, would the final diameter be different? Explain.

Describe the sequence of operations used to produce a typical bolt head.

Describe press forging. How does it differ from drop forging?

In an orthogonal cutting process, following data were observed; chip length of 80 mm was obtained with an uncut chip length of 200 mm and the rake angle used was 200 and depth of cut is 0.5mm. The horizontal and vertical components of cutting force were 2000 N and 200 N respectively. Determine the shear angle, friction angle and resultant cutting force.

Name the different work holding devices or methods in capstan and turret lathes. Describe any one with neat sketch.

Sketch a twist drill and name its different parts.

A 7.5-mm-diameter drill is used on a drill press operating at 300 rpm. If the feed is 0.125 mm/rev, what is the material removal rate (MRR)? What is the MRR if the drill diameter is doubled?

Draw the schematic diagrams of conventional milling and climb milling.

A 120 mm diameter cutter having 10 teeth cuts steel at 40 m/min. The depth of cut is taken as 5 mm and the table feed rate is 150 mm/min. The width of the workpiece is 120 mm. Find the mean area of cross section of the chip in a slab milling operation.

Explain why grinding operations may be necessary for components that have previously been machined.

Write a short note on the Geometrical and Compositional specification of the grinding wheel.