MCQ on Nontraditional Machining Processes with Answers & Explanations

1. Non-Traditional machining is recommended when we need which of the following features?
a) Complex shapes
b) High surface quality
c) Low-rigidity structures 
d) All of the mentioned

 

 

Answer: d

Explanation: For above requirements this machining is used.

2. Non-Traditional machining can also be called as _______ 
a) Contact Machining

b) Non-contact machining
c) Partial contact machining
d) Half contact machining

 

Answer: b

Explanation: Tool and work piece are at a distance apart in this type of machining.

3. In which of the following industries, Non-traditional machining methods play an important role?

a) Automobile

b) Aerospace

c) Medical

d) All of the mentioned

 

 

Answer: d

Explanation: Non-traditional methods are used widely in many industries.

4. Different classifications of Non-traditional machining based on source of energy are ________
a) Mechanical
b) Thermal
c) Chemical and electro-chemical
d) All of the mentioned

 

 

Answer: d

Explanation: It can be classified into the above mentioned categories.

5. In mechanical machining, material is removed by ______ 
a) Erosion
b) Corrosion
c) Abrasion
d) Vaporization

 

 

Answer: a

Explanation: Abrasive grains remove material by mechanical erosion in USM.

6. Material in thermal machining is removed by which of the following means?
a) Vaporization
b) Melting
c) Electro-plating
d) All of the mentioned

 

 

Answer: d

Explanation: In this machining, heat is the source of energy.

7. Which of the following process comes under mechanical machining?

a) USM

b) EDM

c) LBM

d) PAM

 

 

Answer: a

Explanation: USM removes material by mechanical erosion.

8. Vacuum is the machining medium for ________

a) LBM

b) WJM

c) EBM

d) None of the mentioned

 

 

Answer: c

Explanation: Vacuum is the medium for Electron Beam Machining.

9. In chemical machining the material removal takes by?

a) Chemical reaction

b) Erosion

c) Electron removal

d) None of the mentioned

 

 

Answer: a

Explanation: Chemical machining removes material by chemical reactions.

10. What is the full form of USM in advanced machining process?

a) Ultrasound manufacturing

b) Ultrasonic machining

c) UV spectrum manufacturing 

d) Ultra sonar machining

 

 

Answer: b

Explanation: Full form of USM in advanced machining processes, is Ultrasonic machining.

11. USM removes materials using the ____________ tool.

a) Perpendicularly rotating

b) Perpendicularly oscillating

c) Axially oscillating

d) Inclined oscillating

 

 

Answer: c

Explanation: Material is removed using axial oscillating tool.

12. Which is softer material in USM?

a) Tool

b) Work piece

c) Tool & Work piece

d) None of the mentioned

 

 

Answer: a

Explanation: Tool is softer than work piece in USM.

13. The machining system of USM contains which of the following components?

a) Magnetostrictor

b) Concentrator

c) Tools and slurry

d) All of the mentioned

 

 

Answer: d

Explanation: In machining system of USM, the above- mentioned components have to be present.

14. In Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency.

a) True

b) False

 

 

Answer: a

Explanation: To oscillate, magnetostrictor must be energized to the ultrasonic frequency in USM.

15. In Ultrasonic Machining, magnetostrictor converts magnetic energy into which type of energy?

a) Mechanical energy

b) Electrical energy

c) Thermal energy

d) None of the mentioned

 

 

Answer: a

Explanation: Oscillation of magnetostrictor takes place by converting magnetic energy to mechanical energy.

16. In USM, tool tips must have low resistance and fatigue strength.

a) True

b) False

 

 

Answer: b

Explanation: In USM, tool tips should must have high wear resistance and fatigue strength.

17. Which of the following can be used as an abrasive carrying medium?

a) Water

b) Benzene

c) Glycerol

d) All of the mentioned

 

 

Answer: d

Explanation: Any of the above liquids can be used as abrasive carrying medium.

18. If there is an increase in viscosity of slurry, what happens to MRR?

a) Increases

b) Decreases

c) Remains same

d) None of the mentioned

 

 

Answer: b

Explanation: As viscosity is increased, material removal rate is decreased.

19. As the tool area increases, what happens to MRR in USM?

a) Decreases

b) Increases

c) Remains same

d) None of the mentioned

 

 

Answer: a

Explanation: An increase in tool area distributes grains over the work piece, which reduces the machining rate.

20. Which one of the following factors affects the accuracy of parts in USM?

a) Steady abrasive flow

b) Accurate feed

c) Unsteady abrasive flow

d) Ultrasonic frequency

 

 

Answer: c

Explanation: Unsteady and uneven abrasive flow affects the dimensional accuracy.

21. Ultrasonic Machining can be used for which of the following processes and applications?

a) Drilling

b) Sinking and contouring

c) Polishing

d) All of the mentioned

 

 

Answer: d

Explanation: Ultrasonic Machining can be used for drilling holes, sinking, contouring and many more wide variety of applications.

22. How does the current pass between the two electrodes in ECM?

a) Electrolytic solution

b) Direct contact of electrodes

c) All of the mentioned

d) None of the mentioned

 

 

Answer: a

Explanation: Current passes through the solution of electrolyte, which fills the gap between the electrodes.

23. State whether the following statement is true or false regarding the theory of ECM.

“Application of P.D (potential difference) lead to occurrence of several reactions.”

a) True

b) False

 

 

Answer: a

Explanation: When P.D (potential difference) is applied, different reactions occur at anode and cathode.

24. Which of the following come under the main components of ECM?

a) Feed control system

b) Work piece holding devices

c) Electrolyte supply system 

d) All of the mentioned

 

 

Answer: d

Explanation: The main components of Electro chemical machining include feed control system, electrolyte supply system, power supply unit, work piece holding devices.

25. Which components mentioned below are affected due to arcs in EDM?

a) Work piece

b) Tool

c) Work piece & Tool

d) None of the mentioned

 

 

Answer: c

Explanation: Arcs are believed to occur at same spots on electrode surfaces which damage both tool and work piece.

26. Which of the following materials are used as electrodes in EDM?

a) Graphite

b) Copper

c) Brass

d) All of the mentioned

 

 

Answer: d

Explanation: All the materials mentioned above, can be used as electrodes in Electro discharge machining.

27. Which one among the following, is the most important factor in determining the tool wear in EDM?

a) Melting point

b) Boiling point

c) Power supplied

d) Feed rate

 

 

Answer: a

Explanation: In EDM, melting point is the most important factor in determining the tool wear.

28. Which of the following is not a function of dielectric in EDM?

a) Flush particles

b) Cool the section

c) Maintain voltage

d) Provide insulation

 

 

Answer: c

Explanation: Flushing particles, providing insulation and cooling the sections that are heated, are the functions of dielectric.

29. Which of the following are the main requirements of dielectric fluids?

a) Viscosity

b) High flash point

c) Minimum odour

d) All of the mentioned

 

 

Answer: d

Explanation: Adequate viscosity, high flash point, oxidation stability, minimum odour, low cost and good electrical discharge are the main requirements of dielectric fluids.

30. In EDM, inadequate flushing will not result in which of the following consequences?

a) Arcing

b) Debris removal

c) Decrease electrode life

d) Increased production time

 

 

Answer: b

Explanation: Inadequate flushing in Electro discharge machining results in less removal or no removal of debris.

 END