Chemical Machining
Electro Chemical Machining
What are the advantages when we use
Chemical milling process?
a) Weight reduction b) No burrs c) No
stresses d) All of the mentioned
View Answer
Answer: d
Explanation: All the advantages mentioned
above, can be obtained using Chemical milling process.
Weight reduction is possible, on which
type of contours?
a) Very simple b) Simple c) Complex d) None of the mentioned
View Answer
Answer: c
Explanation: Weight reduction can be
possible using Chemical milling, on complex contours, compared to conventional
machining.
Simultaneous material removal using
Chemical milling, results in which of the following?
a) Improves productivity b) Reduces wrapping c) Minimizing part distortion d) All of the mentioned
View Answer
Answer: d
Explanation: All the factor mentioned
above occur, when we use Chemical milling for material removal.
Which type of taper can be achieved, using
Chemical milling, on contours?
a) Discontinuous b) Continuous c)
Periodic d) None of the mentioned
View Answer
Answer: b
Explanation: Using Chemical milling, a
continuous taper, on contours can be achieved.
Which of the following, are the other
advantages of CHM?
a) Design changes b) Less skilled operator c)
Minor tooling costs d) All of
the mentioned
View Answer
Answer: d
Explanation: All of the advantages
mentioned above, are obtained using CHM.
Which of the following is not a limitation
of Chemical milling process?
a) Steep tapers not practical b) Low
scrap rates c) Less scribing accuracy d) Deep narrow cuts
View Answer
Answer: b
Explanation: Low scrap rates are possible
in Chemical milling, which is an advantage to the process.
What is the approximate value of
faraday’s constant?
a) 65,200 C b) 53,800 C c) 96,500 C d) 85,600 C
View Answer
Answer: c
Explanation: 1 faraday equals to approximately 96500 C.
In the following ratios of metal
dissolved amounts, which one represent the current efficiency?
a) Observed to theoretical b) Theoretical to observed
c) All of the mentioned d) None of the mentioned
View Answer
Answer: a
Explanation: In electrochemical machining, current efficiency is the ratio of
observed amount of metal dissolved to the theoretical amount of metal
dissolved.
Apparent current efficiency is due to
which of the following factors?
a) Choice of wrong valence b) Passivation of anodic surface
c) Gas evolution at anode d) All of the mentioned
View Answer
Answer: d
Explanation: Current efficiency may be apparent because of choice of wrong
valence, passivation of anodic surface or gas evolution at anodic surface.
If there is a change in the selected
machining conditions, it will have impact on which of the following?
a) Process accuracy b) Surface finish
c) Process accuracy & Surface finish d) None of the mentioned
View Answer
Answer: c
Explanation: Selected machining conditions should remain unchanged, because, it
will have a direct impact on accuracy and surface finish.
Surface roughness depends on current
density, which is affected by which of the following?
a) Tool feed rate b) Gap voltage
c) Work piece material d) All of the mentioned
View Answer
Answer: d
Explanation: Roughness depend on current density, which is affected by tool
feed rate, gap voltage, work material, pH number, temperature, conductivity and
pressure.
Machining conditions leading to high accuracy
are associated with ________ surface roughness and ________ productivity.
a) Greater, greater b) Smaller, greater c) Greater, smaller d) Smaller, smaller
View Answer
Answer: b
Explanation: Accuracy is associated with smaller surface roughness and greater
machining productivity.
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
View Answer
Answer: d
Explanation: The main components of Electro chemical machining include feed
control system, electrolyte supply system, power supply unit, work piece
holding devices.
Feed control system is responsible for
which action in ECM?
a) Giving feed to tool b) Electrolyte supply
c) Power supply d) None of the mentioned
View Answer
Answer: a
Explanation: Feed control system is used for feeding the tool at constant rate
during equilibrium machining.
In ECM equipment, what is the role of
electrolyte supply system?
a) Giving feed to tool b) Electrolyte supply
c) Power supply d) None of the mentioned
View Answer
Answer: b
Explanation: As the name itself indicates, electrolyte supply system is used to
supply the electrolyte required for anodic dissolution.
What are the main functions of electrolyte
in Electrochemical machining?
a) Conduct machining current b) Removal of debris
c) Maintaining constant temperature d) All of the mentioned
View Answer
Answer: d
Explanation: Main functions of electrolyte are conducting machine current,
removing the debris, carrying away the heat, maintaining constant temperature.
Electrolytic solution should ensure which
type of anodic dissolution?
a) Uniform b) Non-uniform
c) Low speed d) None of the mentioned
View Answer
Answer: a
Explanation: Uniform and high speed anodic dissolution must be ensured by the
electrolyte.
State whether the following statement is
true or false regarding the electrolytic solution.
“In ECM, formation of passive film is recommended.”
a) True b) False
View Answer
Answer: b
Explanation: Electrolytic solution should avoid formation of passive layers on
anode.
Ref: https://www.sanfoundry.com/advanced-machining-questions-answers-edm-applications-1/
R.Satheesh
