This set of tough Advanced Machining Processes questions and answers focuses on “ECG-MRR”.

1. What is the value of gap voltage maintained in ECG process?
a) 1 to 10 V
b) 4 to 40 V
c) 40 to 400 V
d) 500 to 5000 V

Explanation: The value of the gap voltage in ECG process is 4 to 40 V.

2. What are the values of current densities used in the ECG process?
a) 1 to 60 A/cm2
b) 60 to 120 A/cm2
c) 120 to 240 A/cm2
d) 240 to 480 A/cm2

Explanation: The values of current densities range from 120 to 240 A/cm2.

3. Current density depends on which of the following factors?
a) Machined material
b) Gap width
c) Applied voltage
d) All of the mentioned

Explanation: The current density values in Electro chemical grinding depend on machined material, gap width and the applied voltage.

4. What is the main mechanism of material removal in Electro chemical grinding?
a) Mechanical erosion of material
b) Electro chemical dissolution
c) Melting and vaporization
d) Electron removal from material

Explanation: Electro chemical grinding process removes the material mainly by electro chemical dissolution.

5. The grinding wheel is _________ and the work piece is ________ in ECG process.
a) Cathode, anode
b) Anode, cathode
c) Cathode, cathode
d) Anode, anode

Explanation: The grinding wheel is cathode and the work piece is anode in the Electro chemical grinding process.

6. Mechanical abrasion counts to how much amount of the material removal in ECG?
a) 1 to 5%
b) 5 to 10%
c) 10 to 15%
d) 15 to 20%

Explanation: Material removal through abrasion counts to 5 to 10% of the total material removed.

7. Removal rates of ECG process are how may time to that of the conventional machining processes?
a) 2 times
b) 3 times
c) 4 times
d) 5 times

Explanation: The MRR of ECG process are nearly 4 times that of the conventional machining processes.

8. How much amount of burr is produce in Electro chemical grinding process?
a) Less amount
b) Moderate amount
c) High amount
d) No burrs are produced

Explanation: The Electro chemical grinding process is a burr free process which produce parts that are unstressed.

9. What are the volumetric removal rates that are obtained in ECG process?
a) 400 mm3/min
b) 800 mm3/min
c) 1600 mm3/min
d) 3200 mm3/min

Explanation: The volumetric removal rates that are obtained in Electro chemical grinding process will be around 1600 mm3/min.

10. ECG is a hybrid machining process of which material removal mechanisms below?
a) Mechanical abrasion
b) Electro chemical dissolution
c) Mechanical abrasion & Electro chemical dissolution
d) None of the mentioned

Explanation: ECG is a hybrid machining process which uses MA and ECD for material removal.

11. Action of abrasive grains depend on which of the following factors?
a) Electric filed
b) Transport of electrolyte
c) Hydrodynamic effects
d) All of the mentioned

Explanation: Action pf abrasive grains in the gap depends on the electric field, transport of electrolyte and the hydrodynamic effects.

Sanfoundry Global Education & Learning Series – Advanced Machining.

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