ME2026 Unconventional Machining Processes B.E Question Bank : drnnce.ac.in
Name of the College : Dr. Navalar Nedunchezhiyan College of engineering
University : Anna University Chennai
Subject Code/Name : ME2026-Unconventional Machining Processes
Dept : Mechanical Engineering
Degree : B.E
YEAR/SEM: : III/VI
Website : drnnce.ac.in
Document Type : Question Bank
Download Model Question Paper : https://www.pdfquestion.in/uploads/drnnce.ac.in/3205-III%20MECH%20VI%20SEM%20QB%202013%202014%20EVEN.pdf
DR NNCE Unconventional Processes Question Paper
PART-B : 2 MARKS
Unit – I
21. What is meant by conventional machining processes? [AU, MAY-09]
Related : Dr. Navalar Nedunchezhiyan College of Engineering EE1004 Power System Transients B.E Question Bank : www.pdfquestion.in/3210.html
In conventional machining processes, metal is removed by using some sort of the tool which is harder than the work piece being in direct contact with each other.
22. what is meant by unconventional machining processes. [AU, MAY-12] .
The unconventional machining processes do not employ a conventional or traditional tool for metal removal, instead, they directly utilize some from of energy for metal machining. In this process,there is no direct physical contact between the tool and the work piece .
23.what is thermal energy method of unconventional machining? [AU, Apr-13]
In these methods, heat energy is concentrated on a small area of the work piece to melt and vaporize the tiny bits of work material. The required shape is obtained by the continued repetition of this process. Example: LBM, PAM, EBM, IBM.
24.what is an electro chemical energy method of unconventional machining?
In these method, material is removed by ion displacement of the work piece material in contact with a chemical solution Example: ECM, ECG, ECH, ECD.
25.what is chemical energy method of unconventional machining?
The chemical energy method involves controlled etching of the work piece material in contact with a chemical solution. Example: CHM
26.what is mechanical energy method of unconventional machining?
In mechanical energy methods, the material is removed by mechanical erosion of the work piece material. Example: USM, AJM, WJM.
27.List the unconventional machining process which uses mechanical energy. [AU, MAY-09]
1.Ultrasonic machining.
2.Abrasive jet machining.
3.Water jet machining.
28.List the unconventional machining process, which uses thermal or heat energy. [AU, MAY-10]
1.Laser beam machining (LBM).
2.plasma arc machining (PAM).
3.Electron beam machining (EBM).
4.ion beam machining (IBM).
29.List the unconventional machining process, which uses electro chemical energy.
1.Electro chemical machining
2.electro chemical grinding.
3.electro chemical honing.
4.electro chemical deburring.
30.Name the unconventional machining processes which are used to remove maximum material.
1.Electro chemical machining.
2.plasma arc machining.
Part-C : (16 mark questions)
31. Compare the mechanical and electrical energy process in terms of physical parameters, shape capabilities, process capabilities and process economy.
32. State the needs for unconventional machining process. [AU, MAY-09, MAY-10]
33. Compare conventional and unconventional machining processes. [AU, MAY-11, MAY-12]
34. Explain the classification of unconventional machining processes. [AU, MAY-09,Apr-13]
35. What do you understand by chip less machining and what harmful effect may such machining have? Explain. [AU, MAY-12]
36. Make a comparison among various non-traditional machining processes in terms of the following. (1) Cavity-sinking (through) operation (2) pocketing operation (3)Through cutting operations. [AU, MAY-12]
Unit-II
Mechanical Energy Based Processes :
Part-A 1 Mark :
37.In Abrasive Jet Machining (AJM), abrasive particles are made to impinge on the work
material at a
a) High velocity..
b) Medium velocity
c) Low velocity
d) 800-1200 kgf/cm
38. AJM nozzles are made of
(a) low carbon steel
(b) HSS
(c) WC..
(d) Stainless steel
39. Material removal takes place in AJM due to
(a) electrochemical action
(b) mechanical impact..
(c) fatigue failure of the material
(d) sparking on impact
40. As the stand off distance increases, the depth of penetration in AJM
(a) increases
(b) decreases..
(c) does not change
(d) initially increases and then remains steady
41. Estimate the material removal rate in AJM of a brittle material with flow strength of 4 GPa. The abrasive flow rate is 2 gm/min, velocity is 200 m/s and density of the abrasive is 3 gm/cc
A) 48 mm3/min…
B) 38 mm3/min
C) 32 mm3/min
D) 45 mm3/min
42. Material removal rate in AJM is 0.5 mm3/s. Calculate material removal per impact if mass flow rate of abrasive is 3 gm/min, density is 3 gm/cc and grit size is 60 μm as well as indentation radius.
A) 9.78 mm
B) 9.52 mm
C) 9.65 mm
D) 10.25 mm
43.Following are the abrasive materials are
A) Al2O3
B) Sodium carbonite(NaC)
C) Resins
D) Above all
44.Following are one of the compressed gas widely used in AJM process are
A) CO2, N2
B) Sio2,
C) Nacl
D) None of this above.
45.Following are one of the density of the compressed Air in AJM process are
A) 1.3 kg/m3
B) 2.3 kg/m3
C) 4.5 kg/m3
D) 5.5 kg/m3
46.Following are the one of the velocity range of the AJM process are
A) 120-150 m/s
B) 500 ~ 700 m/s
C) 150-250 m/s
D) 300-45o m/s