JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III UNCONVENTIONAL MACHINING PROCESSES Previous Question Paper (July - 2023 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What are the limitations of ultrasonic machining?
Answer
The primary limitations of ultrasonic machining include low material removal rates, high tool wear, and the inability to machine deep holes or complex geometries efficiently. It is also restricted to hard and brittle materials, and the process is limited by the depth of the tool penetration.
Give the classification of modern machining processes.
Answer
Modern machining processes are classified based on the energy source used for material removal:
- Mechanical energy processes: Ultrasonic Machining (USM), Abrasive Jet Machining (AJM), Water Jet Machining (WJM).
- Electrochemical energy processes: Electrochemical Machining (ECM), Electrochemical Grinding (ECG).
- Thermal energy processes: Electric Discharge Machining (EDM), Laser Beam Machining (LBM), Electron Beam Machining (EBM), Plasma Arc Machining (PAM).
- Chemical energy processes: Chemical Milling (CHM), Photochemical Machining (PCM).
What are the applications of water jet machining?
Answer
Sign in to view the complete answer paper.
List out the economic aspects of ECM.
Answer
Sign in to view the complete answer paper.
Give the applications of electric discharge machining.
Answer
Sign in to view the complete answer paper.
What are the steps involved in the generation of sparks in EDM?
Answer
Sign in to view the complete answer paper.
How do you control an electron beam?
Answer
Sign in to view the complete answer paper.
Compare thermal and non-thermal processes.
Answer
Sign in to view the complete answer paper.
What are different types of maskants used in chemical machining?
Answer
Sign in to view the complete answer paper.
List out the applications of plasma arc machining.
Answer
Sign in to view the complete answer paper.
Part B
Discuss the constructional details of the horn of an ultrasonic machine.
Answer
Sign in to view the complete answer paper.
Elaborate the factors to be considered for the selection of non-traditional machining methods for a given application.
Answer
Sign in to view the complete answer paper.
Discuss the influence of process parameters of ultrasonic machining on its performance.
Answer
Sign in to view the complete answer paper.
Build the relationship between the development in materials and non-traditional machining methods.
Answer
Sign in to view the complete answer paper.
Compare abrasive jet machining and abrasive water jet machining.
Answer
Sign in to view the complete answer paper.
How do you estimate the metal removal rate in electro chemical machining?
Answer
Sign in to view the complete answer paper.
Justify the use of electro chemical grinding process in grinding of carbides.
Answer
Sign in to view the complete answer paper.
What is the influence of process variables on the metal removal rate in abrasive water jet machining?
Answer
Sign in to view the complete answer paper.
Identify the factors to be considered for the selection of tool electrode in electric discharge machining.
Answer
Sign in to view the complete answer paper.
Construct an R-L-C circuit used for the control of sparks.
Answer
Sign in to view the complete answer paper.
How do you select the dielectric fluid for electric discharge wire cutting process?
Answer
Sign in to view the complete answer paper.
Develop models for the machining accuracy in electric discharge machining.
Answer
Sign in to view the complete answer paper.
Examine the limitations of electron beam machining.
Answer
Sign in to view the complete answer paper.
Analyze the thermal features of laser beam machining.
Answer
Sign in to view the complete answer paper.
What is the motive for the use of vacuum in electron beam machining?
Answer
Sign in to view the complete answer paper.
Inspect the cutting speed and accuracy aspects of laser beam machining.
Answer
Sign in to view the complete answer paper.
Identify the critical parameters in magnetic abrasive finishing and explain their influence.
Answer
Sign in to view the complete answer paper.
Construct a model for the relationship between process parameters and accuracy in plasma arc machining.
Answer
Sign in to view the complete answer paper.
Develop a model for the removal of material through abrasive flow finishing.
Answer
Sign in to view the complete answer paper.
Identify the limitations for the application of plasma for machining.
Answer
Sign in to view the complete answer paper.