Advanced Machining Questions and Answers – ECG-Accuracy, Applications, Advantages and disadvantages

This set of tough Advanced Machining Processes Multiple Choice Questions(MCQs) focuses on “ECG-Accuracy, Applications, Advantages and disadvantages”.

1. What are the tolerance value that are obtained by using ECG process?
a) ± 0.01 mm
b) ± 0.03 mm
c) ± 0.05 mm
d) ± 0.07 mm
View Answer

Answer: b
Explanation: The tolerance values that are obtained by using Electro chemical grinding are about ± 0.03 mm.

2. Under special circumstances what are the tolerances obtained?
a) ± 0.02 mm
b) ± 0.04 mm
c) ± 0.06 mm
d) ± 0.08 mm
View Answer

Answer: d
Explanation: The tolerance values of about ± 0.08 mm are obtained under special circumstances in Electro chemical grinding.

3. What are the production tolerances obtained in ECG process?
a) ± 0.005 mm
b) ± 0.015 mm
c) ± 0.025 mm
d) ± 0.035 mm
View Answer

Answer: c
Explanation: The production tolerances obtained by machining using Electro chemical grinding process is about ± 0.025 mm.
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4. The tolerance values in ECG depend on which of the following factors?
a) Electrolyte flow
b) Feed rate
c) Metallurgy of material
d) All of the mentioned
View Answer

Answer: d
Explanation: The tolerance values depend on the electrolyte flow, feed rate and the metallurgy of work piece.

5. What are the values of accuracies obtained in ECG process?
a) ± 0.025 mm
b) ± 0.125 mm
c) ± 0.225 mm
d) ± 0.325 mm
View Answer

Answer: b
Explanation: The accuracy values obtained by using Electro chemical grinding process is about ± 0.125 mm.
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6. Which type of voltages are recommended for closer tolerances in ECG?
a) Low
b) Moderate
c) High
d) Very high
View Answer

Answer: a
Explanation: Lower voltages are recommended for closer tolerances, reduced overcut, sharp edges and bright surface finish in the process of Electro chemical grinding.

7. What are the values of radii of corners obtained in ECG?
a) 0.15 to 0.225 mm
b) 0.25 to 0.375 mm
c) 0.45 to 0.525 mm
d) 0.55 to 0.675 mm
View Answer

Answer: b
Explanation: The values of radii of corner range from 0.25 to 0.375 mm.
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8. Surface finish in ECG depend on which of the following factors?
a) Metal machined
b) Abrasive size
c) Wheel speed
d) All of the mentioned
View Answer

Answer: d
Explanation: Surface finish in ECG process depend on metal being machined, abrasive grit size, wheel speed and feed rate.

9. What are the values of radii of corners obtained in ECG?
a) 0.1 to 0.2 µm
b) 0.2 to 0.3 µm
c) 0.3 to 0.4 µm
d) 0.4 to 0.5 µm
View Answer

Answer: b
Explanation: The values of surface finish range from 0.2 to 0.3 µm.
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10. What are the values of voltages used for better surface quality?
a) 1 – 2 V
b) 2 – 3 V
c) 3 – 5 V
d) 5 – 8 V
View Answer

Answer: c
Explanation: Voltages ranging between 3 and 5 V can be used for better surface quality in ECG.

11. What are the machining speeds recommended for high surface quality?
a) 1 – 250 mm/min
b) 250 – 500 mm/min
c) 500 – 750 mm/min
d) 750 – 100 mm/min
View Answer

Answer: b
Explanation: The machining speeds recommended for high surface quality are between 250 and 500 mm/min in ECG.

12. What are the applications of Electro chemical grinding process?
a) Milling the material
b) Tool and cutter sharpening
c) Cutting off
d) All of the mentioned
View Answer

Answer: d
Explanation: The applications of electro chemical grinding are milling, grinding, cutting off, sawing, tool and cutter sharpening.

13. What are the advantages of machining in Electro chemical grinding?
a) Good surface quality
b) Absence of distortion
c) Longer wheel life
d) All of the mentioned
View Answer

Answer: d
Explanation: Good surface quality, absence of distortion, longer wheel life etc.., are some advantages of Electro chemical grinding.

14. Which of the following are the disadvantages of ECG process?
a) High capital cost
b) Limited to conductive materials
c) Corrosive nature
d) All of the mentioned
View Answer

Answer: d
Explanation: High capital cost, limited to conductive materials, corrosive nature etc.., are some disadvantages of ECG.

15. State whether the following statement is true of false regarding ECG process.
“In ECG process, filtering and disposal of electrolyte is not necessary.”
a) True
b) False
View Answer

Answer: b
Explanation: Main disadvantage of ECG is to filter and dispose the electrolyte used in the process.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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