III B.Tech II Semester Supplimentary Examinations, Apr/May 2009 METAL FORMING (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
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1. (a) Discuss the procedure for constructing a three dimensional stress system for a metal forming process. Indicate various stress points. How it can be helpful for metal deformation.
Ultimate tensile strength Offset yield strength Breaking stress Elongation Reduction of Area
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(b) A 13 mm diameter tensile specimen has a 50 mm gage length. The Load corresponding to 0.2 percent offset is 6800 Kg and the maximum load is 8400 Kg. Fracture occurs at 7300 Kg. The diameter after fracture is 8 mm and the gage length at fracture is 65 mm. Calculate
2. (a) Differentiate between a crystal, a dendrite, a grain and grain boundary. (b) Why F.C.C. metals are in general more ductile than B.C.C. and H.C.P. metals. Discuss. [8+8] 3. (a) Explain the process of bending operation? Discuss various types of bending with neat sketches.
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(b) How can spring back be offset? Explain the factors influencing spring back. What is its application and relative merits. [8+8]
4. (a) What is meant by “Throat Depth” of a press? A 200 KN Triple action Hydraulic press is used to punch Hexagonal blanks of 25 mm side having a shear of 2 mm and 50% penetration. Calculate the necessary blanking force?
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(b) Differentiate between Structural components and Guiding components of a press? Discuss the tonnage capacity of Mechanical and Hydraulic presses? [8+8]
5. (a) Discuss various forces in Extrusion process. (b) What are the variables that affect force required to extrude a section ? Explain the concept of Lubrication in Hot extrusion process ? [8+8]
6. (a) Sketch and describe the construction and working of hydrostatic extrusion and mention some of its applications and advantages. 1 of 2
NR
Code No: NR322002
(b) Discuss the effects of deformation speeds, lubricants and different die materials in hot and cold working processes. [8+8] 7. Discuss the following: (a) Residual stress and grain flow characteristics in forged metals
8. (a) Define the following terms in Rolling operation Roll Gap Camber Neutral Point Draft How camber is helpful?
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(b) Forgeability of ferrous and non-ferrous metals.
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(b) Explain the function of backing rolls? Discuss with a neat sketch about the operationof Single and Double backing rolls? [8+8]
NR322002 III B.Tech II Semester Supplimentary Examinations, Apr ...
the concept of Lubrication in Hot extrusion process ? [8+8]. 6. (a) Sketch and describe the construction and working of hydrostatic extrusion and mention some of ...
(a) Briefly explain about the optical fibre construction details and show a figure for · transmission of light rays and discuss about the refractive index distribution.
Sketch and describe the essential elements of a two lipped twist drill. Explain the · functions of all the important elements of a twist drill? [16] · 6. Write short notes ...
a flat plate of chord C = 2m ,and at an angle of attack α = 50 . Analyze the flow · field. Obtain lift, drag and pitching moments from Ackerets theory. Elaborate with.
of transition to be provided? (b) Explain the principles of interlocking. [8+8] · 8. (a) Explain briefly the different factors considered for selection of site of a railway.
(b) A carrier wave of frequency 100 MHz is frequency modulated by sine wave of · amplitude 20 volts and frequency 100 KHz. The frequency sensitivity of the · modulation is 25 KHz per volt. Determine the approximate bandwidth of FM · wave using Carson
(a) What is the difference between chipping and spalling? (b) Explain how tool life curves are established? (c) Discuss working principle of strain gauge ...
Explain the construction of elastic strain gauge? What are the problems associated · with the use of elastic resistance strain gauges how can you find such a ...
of 1 msec synchronizing pulses are applied to the device such that breakdown · voltage is lowered by 50 V at each pulse. The synchronizing pulse frequency.
1. (a) What are the main objectives of using a pattern in sand molding? [7+9] · (b) Explain the ... Explain the principle involved in resistance welding. What are the ...
(a) Give an overview of C++ class structure? (b) Compare the ... What is the difference between the C++ standard library, and the C++ standard · template library ...
250 kN and a minimum value of 100 kN. The properties of the plate material are as follows: · Endurance limit stress = 225 MPa, and yield point stress = 300 MPa.
8. (a) Describe the HyL process of sponge Iron production. [6] · (b) Explain the advantages and disadvantages of HyL process of sponge Iron pro- · duction.
Find the autocorrelation and power spectral density function of X(t). [16] · 2. (a) Define ... Show that v(t) is a combination AM-FM signal. ii. Sketch the phasor ...
distribution within the cylinder. θ denotes a coordinate in a cylindrical coordinate · system. [16] · 8. (a) Two concentric cylindrical metallic shells of radii a & b (i.e. ...
(b) Distinguish between deterministic test pattern generation and probabilistic ... circuit by inserting addition control logic to the following function, obtain the.
(b) Write the principle of gas analysis by thermal conductivity. [8+8] · 5. What are the various designs of manometers used to measure pressure. [16] · 6. A tank of ...
i. Which page will FIFO replace · ii. Which page will LRU replace · iii. Which page will second chance replace · (b) In a fixed-partitioning scheme, what are the ...
1. (a) Explain under what conditions can Fick's first law be used to solve diffusion · problem. (b) In a diffusion anneal, to what level should the initial temperature ...
a(m,n) = a(m-1,a(m,n-1)) if m!=0,n!=0 · (b) Determine what does ... [8+8] · 4. If an array holding a queue is not considered circular, the general method suggests.
(b) A hydraulic press has diameter of ram 200 mm and of plunger 40 mm. It is provided with a lever for applying force to the plunger. If the ratio of leverage.
(b) In what way C++ throw specification differs from throw clause in java. [8] · 8. Explain in detail the sequence control in ML. [16] · *****. 1 of 1. AjntuWorld.in.
