JNTU
JNTU B.Tech III MACHINE TOOLS Previous Question Paper (November/December - 2017 - 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.
Part A
Describe the basic elements of machining.
Answer
The basic elements of machining are the workpiece, which is the raw material; the cutting tool, which removes material in the form of chips; and the machine tool, which provides the relative motion and power required for the cutting action.
How does a build up edge is formed? Explain its effects.
Answer
A Built-Up Edge (BUE) forms when work material welds to the tool rake face due to high pressure and temperature at the tool-chip interface. Its effects include increased cutting forces, degraded surface finish, and accelerated tool wear as the BUE periodically breaks off and carries away tool material.
What is a Lathe what are the types of Lathe.
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List out various types of Lathe attachment explain any one.
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Classify different types of Drilling machines.
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Explain the working principle of slotter.
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Explain the principle of milling machine.
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Write about various advantage and limitations of honing and lapping.
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How are abrasives selected for grinding operation?
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Compare and contrast grinding, lapping and honing.
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Part B
Derive the expression for chip thickness ratio.
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Determine the cutting speed and machining time per cut when the work piece having 45 mm diameter is rotating at 400 rpm. The feed given as 0.15 mm/rev and length of cut 6cm.
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In orthogonal cutting of mid steel component, if the rake angle of the cutting tool is 120 and the shear angle is 420. Find the chip thickness ratio.
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What are the desirable Characteristics of cutting material? Describe them in brief.
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Draw the tool layout of Hexagonal head bolt.
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Diagrammatically explain the thread cutting on the lathe machine.
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How lathe is specified explain briefly the operations that are performed on a lathe.
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Explain what is meant by a Taper. Discuss in detail the taper turning by compound rest swelling method?
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Describe the operation of quick return motion in mechanical Shaper.
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Find the machining time required for machining the surface 600 × 800 mm, on a shaping machine. Assume, cutting speed as 8 m/min. The return to cutting time ratio is 1:4, and the feed is 2 mm/ stroke. The approach and overrun at each end is 70 mm.
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With the help of neat sketch explain the radial drilling machine.
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Estimate the time required to drill a hole on a wider face of a give workpiece of size 2m × 1m × 50mm.Assuming the cutting angle as 230 degrees, approach and overrun be 30 mm each, cutting velocity 52m/min, feed be 2mm/stroke and clearance on both side be 20mm.
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Differentiate between up milling and down milling and explain their applications.
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Explain in detail various operations performed on milling machine.
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Explain the procedure for simple indexing with an example.
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With the help of neat sketch explain the geometry of milling cutter.
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What are surface grinding machine, explain various surface grinding machines.
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Describe grinding wheel structure with a neat sketch.
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What are special types of grinding machine explain two in detail.
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What is meant by centerless grinding? State its advantages and limitation of it.
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